Fixed 2 small bugs in RelationalOperationEval (added junits). Refactored hierarchy.

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@692239 13f79535-47bb-0310-9956-ffa450edef68

src/java/org/apache/poi/hssf/record/formula/eval/EqualEval.java

@@ -1,67 +1,34 @@
-/*
-* Licensed to the Apache Software Foundation (ASF) under one or more
-* contributor license agreements.  See the NOTICE file distributed with
-* this work for additional information regarding copyright ownership.
-* The ASF licenses this file to You under the Apache License, Version 2.0
-* (the "License"); you may not use this file except in compliance with
-* the License.  You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
-/*
- * Created on May 8, 2005
- *
- */
-package org.apache.poi.hssf.record.formula.eval;
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
 
-import org.apache.poi.hssf.record.formula.EqualPtg;
-import org.apache.poi.hssf.record.formula.Ptg;
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+
+package org.apache.poi.hssf.record.formula.eval;
 
 /**
  * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
  *  
  */
-public class EqualEval extends RelationalOperationEval {
+public final class EqualEval extends RelationalOperationEval {
 
-    private EqualPtg delegate;
+	public static final OperationEval instance = new EqualEval();
+	
+	private EqualEval() {
+	}
 
-    public EqualEval(Ptg ptg) {
-        this.delegate = (EqualPtg) ptg;
-    }
-
-    
-    public Eval evaluate(Eval[] operands, int srcRow, short srcCol) {
-        ValueEval retval = null;
-        
-        RelationalValues rvs = super.doEvaluate(operands, srcRow, srcCol);
-        retval = rvs.ee;
-        int result = 0;
-        if (retval == null) {
-            result = doComparison(rvs.bs);
-            if (result == 0) {
-                result = doComparison(rvs.ss);
-            }
-            if (result == 0) {
-                result = doComparison(rvs.ds);
-            }
-
-            retval = (result == 0) ? BoolEval.TRUE : BoolEval.FALSE;
-        }
-
-        return retval;
-    }
-
-    public int getNumberOfOperands() {
-        return delegate.getNumberOfOperands();
-    }
-
-    public int getType() {
-        return delegate.getType();
-    }
+	protected boolean convertComparisonResult(int cmpResult) {
+		return cmpResult == 0;
+	}
 }

src/java/org/apache/poi/hssf/record/formula/eval/GreaterEqualEval.java

@@ -1,67 +1,34 @@
-/*
-* Licensed to the Apache Software Foundation (ASF) under one or more
-* contributor license agreements.  See the NOTICE file distributed with
-* this work for additional information regarding copyright ownership.
-* The ASF licenses this file to You under the Apache License, Version 2.0
-* (the "License"); you may not use this file except in compliance with
-* the License.  You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
-/*
- * Created on May 8, 2005
- *
- */
-package org.apache.poi.hssf.record.formula.eval;
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
 
-import org.apache.poi.hssf.record.formula.GreaterEqualPtg;
-import org.apache.poi.hssf.record.formula.Ptg;
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+
+package org.apache.poi.hssf.record.formula.eval;
 
 /**
  * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
  *  
  */
-public class GreaterEqualEval extends RelationalOperationEval {
+public final class GreaterEqualEval extends RelationalOperationEval {
 
-    private GreaterEqualPtg delegate;
-
-    public GreaterEqualEval(Ptg ptg) {
-        this.delegate = (GreaterEqualPtg) ptg;
-    }
-
-    public Eval evaluate(Eval[] operands, int srcRow, short srcCol) {
-        ValueEval retval = null;
-        
-        RelationalValues rvs = super.doEvaluate(operands, srcRow, srcCol);
-        retval = rvs.ee;
-        int result = 0;
-        if (retval == null) {
-            result = doComparison(rvs.bs);
-            if (result == 0) {
-                result = doComparison(rvs.ss);
-            }
-            if (result == 0) {
-                result = doComparison(rvs.ds);
-            }
-
-            retval = (result >= 0) ? BoolEval.TRUE : BoolEval.FALSE;
-        }
-
-        return retval;
-    }
-
-    public int getNumberOfOperands() {
-        return delegate.getNumberOfOperands();
-    }
-
-    public int getType() {
-        return delegate.getType();
-    }
+	public static final OperationEval instance = new GreaterEqualEval();
+	
+	private GreaterEqualEval() {
+	}
 
+	protected boolean convertComparisonResult(int cmpResult) {
+		return cmpResult >= 0;
+	}
 }

src/java/org/apache/poi/hssf/record/formula/eval/GreaterThanEval.java

@@ -1,67 +1,34 @@
-/*
-* Licensed to the Apache Software Foundation (ASF) under one or more
-* contributor license agreements.  See the NOTICE file distributed with
-* this work for additional information regarding copyright ownership.
-* The ASF licenses this file to You under the Apache License, Version 2.0
-* (the "License"); you may not use this file except in compliance with
-* the License.  You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
-/*
- * Created on May 8, 2005
- *
- */
-package org.apache.poi.hssf.record.formula.eval;
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
 
-import org.apache.poi.hssf.record.formula.GreaterThanPtg;
-import org.apache.poi.hssf.record.formula.Ptg;
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+
+package org.apache.poi.hssf.record.formula.eval;
 
 /**
  * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
  *  
  */
-public class GreaterThanEval extends RelationalOperationEval {
+public final class GreaterThanEval extends RelationalOperationEval {
 
-    private GreaterThanPtg delegate;
-
-    public GreaterThanEval(Ptg ptg) {
-        this.delegate = (GreaterThanPtg) ptg;
-    }
-
-    public Eval evaluate(Eval[] operands, int srcRow, short srcCol) {
-        ValueEval retval = null;
-        
-        RelationalValues rvs = super.doEvaluate(operands, srcRow, srcCol);
-        retval = rvs.ee;
-        int result = 0;
-        if (retval == null) {
-            result = doComparison(rvs.bs);
-            if (result == 0) {
-                result = doComparison(rvs.ss);
-            }
-            if (result == 0) {
-                result = doComparison(rvs.ds);
-            }
-
-            retval = (result > 0) ? BoolEval.TRUE : BoolEval.FALSE;;
-        }
-
-        return retval;
-    }
-
-    public int getNumberOfOperands() {
-        return delegate.getNumberOfOperands();
-    }
-
-    public int getType() {
-        return delegate.getType();
-    }
+	public static final OperationEval instance = new GreaterThanEval();
+	
+	private GreaterThanEval() {
+	}
 
+	protected boolean convertComparisonResult(int cmpResult) {
+		return cmpResult > 0;
+	}
 }

src/java/org/apache/poi/hssf/record/formula/eval/LazyAreaEval.java

@@ -1,33 +1,35 @@
-/*
-* Licensed to the Apache Software Foundation (ASF) under one or more
-* contributor license agreements.  See the NOTICE file distributed with
-* this work for additional information regarding copyright ownership.
-* The ASF licenses this file to You under the Apache License, Version 2.0
-* (the "License"); you may not use this file except in compliance with
-* the License.  You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
 
 package org.apache.poi.hssf.record.formula.eval;
 
 import org.apache.poi.hssf.record.formula.AreaI;
 import org.apache.poi.hssf.record.formula.AreaI.OffsetArea;
+import org.apache.poi.hssf.usermodel.EvaluationCache;
 import org.apache.poi.hssf.usermodel.HSSFCell;
 import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator;
 import org.apache.poi.hssf.usermodel.HSSFRow;
 import org.apache.poi.hssf.usermodel.HSSFSheet;
 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.hssf.util.CellReference;
 
 /**
- * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
- * 
+ *
+ * @author Josh Micich 
  */
 public final class LazyAreaEval extends AreaEvalBase {
 
@@ -62,4 +64,18 @@ public final class LazyAreaEval extends AreaEvalBase {
 
 		return new LazyAreaEval(area, _sheet, _workbook);
 	}
+	public String toString() {
+		CellReference crA = new CellReference(getFirstRow(), getFirstColumn());
+		CellReference crB = new CellReference(getLastRow(), getLastColumn());
+		StringBuffer sb = new StringBuffer();
+		sb.append(getClass().getName()).append("[");
+		String sheetName = _workbook.getSheetName(_workbook.getSheetIndex(_sheet));
+		sb.append(sheetName);
+		sb.append('!');
+		sb.append(crA.formatAsString());
+		sb.append(':');
+		sb.append(crB.formatAsString());
+		sb.append("]");
+		return sb.toString();
+	}
 }

src/java/org/apache/poi/hssf/record/formula/eval/LazyRefEval.java

@@ -1,15 +1,38 @@
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+
 package org.apache.poi.hssf.record.formula.eval;
 
 import org.apache.poi.hssf.record.formula.AreaI;
 import org.apache.poi.hssf.record.formula.AreaI.OffsetArea;
 import org.apache.poi.hssf.record.formula.Ref3DPtg;
 import org.apache.poi.hssf.record.formula.RefPtg;
+import org.apache.poi.hssf.usermodel.EvaluationCache;
 import org.apache.poi.hssf.usermodel.HSSFCell;
 import org.apache.poi.hssf.usermodel.HSSFFormulaEvaluator;
 import org.apache.poi.hssf.usermodel.HSSFRow;
 import org.apache.poi.hssf.usermodel.HSSFSheet;
 import org.apache.poi.hssf.usermodel.HSSFWorkbook;
+import org.apache.poi.hssf.util.CellReference;
 
+/**
+*
+* @author Josh Micich 
+*/
 public final class LazyRefEval extends RefEvalBase {
 
 	private final HSSFSheet _sheet;
@@ -49,4 +72,16 @@ public final class LazyRefEval extends RefEvalBase {
 
 		return new LazyAreaEval(area, _sheet, _workbook);
 	}
+	
+	public String toString() {
+		CellReference cr = new CellReference(getRow(), getColumn());
+		StringBuffer sb = new StringBuffer();
+		sb.append(getClass().getName()).append("[");
+		String sheetName = _workbook.getSheetName(_workbook.getSheetIndex(_sheet));
+		sb.append(sheetName);
+		sb.append('!');
+		sb.append(cr.formatAsString());
+		sb.append("]");
+		return sb.toString();
+	}
 }

src/java/org/apache/poi/hssf/record/formula/eval/LessEqualEval.java

@@ -1,67 +1,34 @@
-/*
-* Licensed to the Apache Software Foundation (ASF) under one or more
-* contributor license agreements.  See the NOTICE file distributed with
-* this work for additional information regarding copyright ownership.
-* The ASF licenses this file to You under the Apache License, Version 2.0
-* (the "License"); you may not use this file except in compliance with
-* the License.  You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
-/*
- * Created on May 8, 2005
- *
- */
-package org.apache.poi.hssf.record.formula.eval;
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
 
-import org.apache.poi.hssf.record.formula.LessEqualPtg;
-import org.apache.poi.hssf.record.formula.Ptg;
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+
+package org.apache.poi.hssf.record.formula.eval;
 
 /**
  * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
  *  
  */
-public class LessEqualEval extends RelationalOperationEval {
+public final class LessEqualEval extends RelationalOperationEval {
 
-    private LessEqualPtg delegate;
-
-    public LessEqualEval(Ptg ptg) {
-        this.delegate = (LessEqualPtg) ptg;
-    }
-
-    public Eval evaluate(Eval[] operands, int srcRow, short srcCol) {
-        ValueEval retval = null;
-        
-        RelationalValues rvs = super.doEvaluate(operands, srcRow, srcCol);
-        retval = rvs.ee;
-        int result = 0;
-        if (retval == null) {
-            result = doComparison(rvs.bs);
-            if (result == 0) {
-                result = doComparison(rvs.ss);
-            }
-            if (result == 0) {
-                result = doComparison(rvs.ds);
-            }
-
-            retval = (result <= 0) ? BoolEval.TRUE : BoolEval.FALSE;;
-        }
-
-        return retval;
-    }
-
-    public int getNumberOfOperands() {
-        return delegate.getNumberOfOperands();
-    }
-
-    public int getType() {
-        return delegate.getType();
-    }
+	public static final OperationEval instance = new LessEqualEval();
+	
+	private LessEqualEval() {
+	}
 
+	protected boolean convertComparisonResult(int cmpResult) {
+		return cmpResult <= 0;
+	}
 }

src/java/org/apache/poi/hssf/record/formula/eval/LessThanEval.java

@@ -1,68 +1,34 @@
-/*
-* Licensed to the Apache Software Foundation (ASF) under one or more
-* contributor license agreements.  See the NOTICE file distributed with
-* this work for additional information regarding copyright ownership.
-* The ASF licenses this file to You under the Apache License, Version 2.0
-* (the "License"); you may not use this file except in compliance with
-* the License.  You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
-/*
- * Created on May 8, 2005
- *
- */
-package org.apache.poi.hssf.record.formula.eval;
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
 
-import org.apache.poi.hssf.record.formula.LessThanPtg;
-import org.apache.poi.hssf.record.formula.Ptg;
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+
+package org.apache.poi.hssf.record.formula.eval;
 
 /**
  * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
  *  
  */
-public class LessThanEval extends RelationalOperationEval {
+public final class LessThanEval extends RelationalOperationEval {
 
-    private LessThanPtg delegate;
-
-    public LessThanEval(Ptg ptg) {
-        this.delegate = (LessThanPtg) ptg;
-    }
-
-
-    public Eval evaluate(Eval[] operands, int srcRow, short srcCol) {
-        ValueEval retval = null;
-        
-        RelationalValues rvs = super.doEvaluate(operands, srcRow, srcCol);
-        retval = rvs.ee;
-        int result = 0;
-        if (retval == null) {
-            result = doComparison(rvs.bs);
-            if (result == 0) {
-                result = doComparison(rvs.ss);
-            }
-            if (result == 0) {
-                result = doComparison(rvs.ds);
-            }
-
-            retval = (result < 0) ? BoolEval.TRUE : BoolEval.FALSE;;
-        }
-
-        return retval;
-    }
-
-    public int getNumberOfOperands() {
-        return delegate.getNumberOfOperands();
-    }
-
-    public int getType() {
-        return delegate.getType();
-    }
+	public static final OperationEval instance = new LessThanEval();
+	
+	private LessThanEval() {
+	}
 
+	protected boolean convertComparisonResult(int cmpResult) {
+		return cmpResult < 0;
+	}
 }

src/java/org/apache/poi/hssf/record/formula/eval/NotEqualEval.java

@@ -1,68 +1,34 @@
-/*
-* Licensed to the Apache Software Foundation (ASF) under one or more
-* contributor license agreements.  See the NOTICE file distributed with
-* this work for additional information regarding copyright ownership.
-* The ASF licenses this file to You under the Apache License, Version 2.0
-* (the "License"); you may not use this file except in compliance with
-* the License.  You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
-/*
- * Created on May 8, 2005
- *
- */
-package org.apache.poi.hssf.record.formula.eval;
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
 
-import org.apache.poi.hssf.record.formula.NotEqualPtg;
-import org.apache.poi.hssf.record.formula.Ptg;
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+
+package org.apache.poi.hssf.record.formula.eval;
 
 /**
  * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
  *  
  */
-public class NotEqualEval extends RelationalOperationEval {
+public final class NotEqualEval extends RelationalOperationEval {
 
-    private NotEqualPtg delegate;
-
-    public NotEqualEval(Ptg ptg) {
-        this.delegate = (NotEqualPtg) ptg;
-    }
-
-
-    public Eval evaluate(Eval[] operands, int srcRow, short srcCol) {
-        ValueEval retval = null;
-        
-        RelationalValues rvs = super.doEvaluate(operands, srcRow, srcCol);
-        retval = rvs.ee;
-        int result = 0;
-        if (retval == null) {
-            result = doComparison(rvs.bs);
-            if (result == 0) {
-                result = doComparison(rvs.ss);
-            }
-            if (result == 0) {
-                result = doComparison(rvs.ds);
-            }
-
-            retval = (result != 0) ? BoolEval.TRUE : BoolEval.FALSE;
-        }
-
-        return retval;
-    }
-
-    public int getNumberOfOperands() {
-        return delegate.getNumberOfOperands();
-    }
-
-    public int getType() {
-        return delegate.getType();
-    }
+	public static final OperationEval instance = new NotEqualEval();
+	
+	private NotEqualEval() {
+	}
 
+	protected boolean convertComparisonResult(int cmpResult) {
+		return cmpResult != 0;
+	}
 }

src/java/org/apache/poi/hssf/record/formula/eval/RelationalOperationEval.java

@@ -1,216 +1,145 @@
-/*
-* Licensed to the Apache Software Foundation (ASF) under one or more
-* contributor license agreements.  See the NOTICE file distributed with
-* this work for additional information regarding copyright ownership.
-* The ASF licenses this file to You under the Apache License, Version 2.0
-* (the "License"); you may not use this file except in compliance with
-* the License.  You may obtain a copy of the License at
-*
-*     http://www.apache.org/licenses/LICENSE-2.0
-*
-* Unless required by applicable law or agreed to in writing, software
-* distributed under the License is distributed on an "AS IS" BASIS,
-* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-* See the License for the specific language governing permissions and
-* limitations under the License.
-*/
-/*
- * Created on May 10, 2005
- *
- */
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+
 package org.apache.poi.hssf.record.formula.eval;
 
 /**
+ * Base class for all comparison operator evaluators
+ * 
  * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
- *
  */
 public abstract class RelationalOperationEval implements OperationEval {
 
-    protected class RelationalValues {
-        public Double[] ds = new Double[2];
-        public Boolean[] bs = new Boolean[2];
-        public String[] ss = new String[3];
-        public ErrorEval ee = null;
-    }
+	/**
+	 * Converts a standard compare result (-1, 0, 1) to <code>true</code> or <code>false</code>
+	 * according to subclass' comparison type.
+	 */
+	protected abstract boolean convertComparisonResult(int cmpResult);
 
-    
-    /*
-     * This is a description of how the relational operators apply in MS Excel.
-     * Use this as a guideline when testing/implementing the evaluate methods 
-     * for the relational operators Evals.
-     * 
-     * Bool > any number. ALWAYS
-     * Bool > any string. ALWAYS
-     * Bool.TRUE > Bool.FALSE
-     * 
-     * String > any number. ALWAYS
-     * String > Blank. ALWAYS
-     * String are sorted dictionary wise
-     * 
-     * Blank == 0 (numeric)
-     */
-    public RelationalValues doEvaluate(Eval[] operands, int srcRow, short srcCol) {
-        RelationalValues retval = new RelationalValues();
-        
-        switch (operands.length) {
-        default:
-            retval.ee = ErrorEval.VALUE_INVALID;
-            break;
-        case 2:
-            internalDoEvaluate(operands, srcRow, srcCol, retval, 0);
-            internalDoEvaluate(operands, srcRow, srcCol, retval, 1);
-        } // end switch
-        return retval;
-    }
-    
-    /**
-     * convenience method to avoid code duplication for multiple operands
-     * @param operands
-     * @param srcRow
-     * @param srcCol
-     * @param retval
-     * @param index
-     */
-    private void internalDoEvaluate(Eval[] operands, int srcRow, short srcCol, RelationalValues retval, int index) {
-        if (operands[index] instanceof BoolEval) {
-            BoolEval be = (BoolEval) operands[index];
-            retval.bs[index] = Boolean.valueOf(be.getBooleanValue());
-        }
-        else if (operands[index] instanceof NumericValueEval) {
-            NumericValueEval ne = (NumericValueEval) operands[index];
-            retval.ds[index] = new Double(ne.getNumberValue());
-        }
-        else if (operands[index] instanceof StringValueEval) {
-            StringValueEval se = (StringValueEval) operands[index];
-            retval.ss[index] = se.getStringValue();
-        }
-        else if (operands[index] instanceof RefEval) {
-            RefEval re = (RefEval) operands[index];
-            ValueEval ve = re.getInnerValueEval();
-            if (ve instanceof BoolEval) {
-                BoolEval be = (BoolEval) ve;
-                retval.bs[index] = Boolean.valueOf(be.getBooleanValue());
-            }
-            else if (ve instanceof BlankEval) {
-                retval.ds[index] = new Double(0);
-            }
-            else if (ve instanceof NumericValueEval) {
-                NumericValueEval ne = (NumericValueEval) ve;
-                retval.ds[index] = new Double(ne.getNumberValue());
-            }
-            else if (ve instanceof StringValueEval) {
-                StringValueEval se = (StringValueEval) ve;
-                retval.ss[index] = se.getStringValue();
-            }
-        }
-        else if (operands[index] instanceof AreaEval) {
-            AreaEval ae = (AreaEval) operands[index];
-            if (ae.isRow()) {
-                if (ae.containsColumn(srcCol)) {
-                    ValueEval ve = ae.getValueAt(ae.getFirstRow(), srcCol);
-                    if (ve instanceof BoolEval) {
-                        BoolEval be = (BoolEval) ve;
-                        retval.bs[index] = Boolean.valueOf(be.getBooleanValue());
-                    }
-                    else if (ve instanceof BlankEval) {
-                        retval.ds[index] = new Double(0);
-                    }
-                    else if (ve instanceof NumericValueEval) {
-                        NumericValueEval ne = (NumericValueEval) ve;
-                        retval.ds[index] = new Double(ne.getNumberValue());
-                    }
-                    else if (ve instanceof StringValueEval) {
-                        StringValueEval se = (StringValueEval) ve;
-                        retval.ss[index] = se.getStringValue();
-                    }
-                    else {
-                        retval.ee = ErrorEval.VALUE_INVALID;
-                    }
-                }
-                else {
-                    retval.ee = ErrorEval.VALUE_INVALID;
-                }
-            }
-            else if (ae.isColumn()) {
-                if (ae.containsRow(srcRow)) {
-                    ValueEval ve = ae.getValueAt(srcRow, ae.getFirstColumn());
-                    if (ve instanceof BoolEval) {
-                        BoolEval be = (BoolEval) ve;
-                        retval.bs[index] = Boolean.valueOf(be.getBooleanValue());
-                    }
-                    else if (ve instanceof BlankEval) {
-                        retval.ds[index] = new Double(0);
-                    }
-                    else if (ve instanceof NumericValueEval) {
-                        NumericValueEval ne = (NumericValueEval) ve;
-                        retval.ds[index] = new Double(ne.getNumberValue());
-                    }
-                    else if (ve instanceof StringValueEval) {
-                        StringValueEval se = (StringValueEval) ve;
-                        retval.ss[index] = se.getStringValue();
-                    }
-                    else {
-                        retval.ee = ErrorEval.VALUE_INVALID;
-                    }
-                }
-                else {
-                    retval.ee = ErrorEval.VALUE_INVALID;
-                }
-            }
-            else {
-                retval.ee = ErrorEval.VALUE_INVALID;
-            }
-        }
-    }
-    
-    // if both null return 0, else non null wins, else TRUE wins
-    protected int doComparison(Boolean[] bs) {
-        int retval = 0;
-        if (bs[0] != null || bs[1] != null) {
-            retval = bs[0] != null
-                    ? bs[1] != null
-                            ? bs[0].booleanValue()
-                                    ? bs[1].booleanValue()
-                                            ? 0
-                                            : 1
-                                    : bs[1].booleanValue()
-                                            ? -1
-                                            : 0
-                            : 1
-                    : bs[1] != null
-                            ? -1
-                            : 0;
-        }
-        return retval;
-    }
+	/**
+	 * This is a description of how the relational operators apply in MS Excel.
+	 * Use this as a guideline when testing/implementing the evaluate methods
+	 * for the relational operators Evals.
+	 *
+	 * <pre>
+	 * Bool.TRUE > any number.
+	 * Bool > any string. ALWAYS
+	 * Bool.TRUE > Bool.FALSE
+	 * Bool.FALSE == Blank
+	 *
+	 * Strings are never converted to numbers or booleans
+	 * String > any number. ALWAYS
+	 * Non-empty String > Blank
+	 * Empty String == Blank
+	 * String are sorted dictionary wise
+	 *
+	 * Blank > Negative numbers
+	 * Blank == 0
+	 * Blank < Positive numbers
+	 * </pre>
+	 */
+	public final Eval evaluate(Eval[] operands, int srcRow, short srcCol) {
+		if (operands.length != 2) {
+			return ErrorEval.VALUE_INVALID;
+		}
 
-    // if both null return 0, else non null wins, else string compare
-    protected int doComparison(String[] ss) {
-        int retval = 0;
-        if (ss[0] != null || ss[1] != null) {
-            retval = ss[0] != null
-                    ? ss[1] != null
-                            ? ss[0].compareTo(ss[1])
-                            : 1
-                    : ss[1] != null
-                            ? -1
-                            : 0;
-        }
-        return retval;
-    }
+		ValueEval vA;
+		ValueEval vB;
+		try {
+			vA = OperandResolver.getSingleValue(operands[0], srcRow, srcCol);
+			vB = OperandResolver.getSingleValue(operands[1], srcRow, srcCol);
+		} catch (EvaluationException e) {
+			return e.getErrorEval();
+		}
+		int cmpResult = doCompare(vA, vB);
+		boolean result = convertComparisonResult(cmpResult);
+		return BoolEval.valueOf(result);
+	}
 
-    // if both null return 0, else non null wins, else doublevalue compare
-    protected int doComparison(Double[] ds) {
-        int retval = 0;
-        if (ds[0] != null || ds[1] != null) {
-            retval = ds[0] != null
-                    ? ds[1] != null
-                            ? ds[0].compareTo(ds[1])
-                            : 1
-                    : ds[1] != null
-                            ? -1
-                            : 0;
-        }
-        return retval;
-    }
+	private static int doCompare(ValueEval va, ValueEval vb) {
+		// special cases when one operand is blank
+		if (va == BlankEval.INSTANCE) {
+			return compareBlank(vb);
+		}
+		if (vb == BlankEval.INSTANCE) {
+			return -compareBlank(va);
+		}
+
+		if (va instanceof BoolEval) {
+			if (vb instanceof BoolEval) {
+				BoolEval bA = (BoolEval) va;
+				BoolEval bB = (BoolEval) vb;
+				if (bA.getBooleanValue() == bB.getBooleanValue()) {
+					return 0;
+				}
+				return bA.getBooleanValue() ? 1 : -1;
+			}
+			return 1;
+		}
+		if (vb instanceof BoolEval) {
+			return -1;
+		}
+		if (va instanceof StringEval) {
+			if (vb instanceof StringEval) {
+				StringEval sA = (StringEval) va;
+				StringEval sB = (StringEval) vb;
+				return sA.getStringValue().compareTo(sB.getStringValue());
+			}
+			return 1;
+		}
+		if (vb instanceof StringEval) {
+			return -1;
+		}
+		if (va instanceof NumberEval) {
+			if (vb instanceof NumberEval) {
+				NumberEval nA = (NumberEval) va;
+				NumberEval nB = (NumberEval) vb;
+				return Double.compare(nA.getNumberValue(), nB.getNumberValue());
+			}
+		}
+		throw new IllegalArgumentException("Bad operand types (" + va.getClass().getName() + "), ("
+				+ vb.getClass().getName() + ")");
+	}
+
+	private static int compareBlank(ValueEval v) {
+		if (v == BlankEval.INSTANCE) {
+			return 0;
+		}
+		if (v instanceof BoolEval) {
+			BoolEval boolEval = (BoolEval) v;
+			return boolEval.getBooleanValue() ? -1 : 0;
+		}
+		if (v instanceof NumberEval) {
+			NumberEval ne = (NumberEval) v;
+			return Double.compare(0, ne.getNumberValue());
+		}
+		if (v instanceof StringEval) {
+			StringEval se = (StringEval) v;
+			return se.getStringValue().length() < 1 ? 0 : -1;
+		}
+		throw new IllegalArgumentException("bad value class (" + v.getClass().getName() + ")");
+	}
+
+	public final int getNumberOfOperands() {
+		return 2;
+	}
+
+	public final int getType() {
+		// TODO - get rid of this method
+		throw new RuntimeException("Obsolete code - should not be called");
+	}
 }

src/java/org/apache/poi/hssf/usermodel/OperationEvaluatorFactory.java

@@ -69,8 +69,9 @@ import org.apache.poi.hssf.record.formula.eval.UnaryPlusEval;
  */
 final class OperationEvaluatorFactory {
 	private static final Class[] OPERATION_CONSTRUCTOR_CLASS_ARRAY = new Class[] { Ptg.class };
-	
+	// TODO - use singleton instances directly instead of reflection
 	private static final Map _constructorsByPtgClass = initialiseConstructorsMap();
+	private static final Map _instancesByPtgClass = initialiseInstancesMap();
 	
 	private OperationEvaluatorFactory() {
 		// no instances of this class
@@ -81,15 +82,9 @@ final class OperationEvaluatorFactory {
 		add(m, AddPtg.class, AddEval.class);
 		add(m, ConcatPtg.class, ConcatEval.class);
 		add(m, DividePtg.class, DivideEval.class);
-		add(m, EqualPtg.class, EqualEval.class);
 		add(m, FuncPtg.class, FuncVarEval.class);
 		add(m, FuncVarPtg.class, FuncVarEval.class);
-		add(m, GreaterEqualPtg.class, GreaterEqualEval.class);
-		add(m, GreaterThanPtg.class, GreaterThanEval.class);
-		add(m, LessEqualPtg.class, LessEqualEval.class);
-		add(m, LessThanPtg.class, LessThanEval.class);
 		add(m, MultiplyPtg.class, MultiplyEval.class);
-		add(m, NotEqualPtg.class, NotEqualEval.class);
 		add(m, PercentPtg.class, PercentEval.class);
 		add(m, PowerPtg.class, PowerEval.class);
 		add(m, SubtractPtg.class, SubtractEval.class);
@@ -97,13 +92,30 @@ final class OperationEvaluatorFactory {
 		add(m, UnaryPlusPtg.class, UnaryPlusEval.class);
 		return m;
 	}
+	private static Map initialiseInstancesMap() {
+		Map m = new HashMap(32);
+		add(m, EqualPtg.class, EqualEval.instance);
+		add(m, GreaterEqualPtg.class, GreaterEqualEval.instance);
+		add(m, GreaterThanPtg.class, GreaterThanEval.instance);
+		add(m, LessEqualPtg.class, LessEqualEval.instance);
+		add(m, LessThanPtg.class, LessThanEval.instance);
+		add(m, NotEqualPtg.class, NotEqualEval.instance);
+		return m;
+	}
+
+	private static void add(Map m, Class ptgClass, OperationEval evalInstance) {
+		if(!Ptg.class.isAssignableFrom(ptgClass)) {
+			throw new IllegalArgumentException("Expected Ptg subclass");
+		}
+		m.put(ptgClass, evalInstance);
+	}
 
 	private static void add(Map m, Class ptgClass, Class evalClass) {
-		
 		// perform some validation now, to keep later exception handlers simple
 		if(!Ptg.class.isAssignableFrom(ptgClass)) {
 			throw new IllegalArgumentException("Expected Ptg subclass");
 		}
+		
 		if(!OperationEval.class.isAssignableFrom(evalClass)) {
 			throw new IllegalArgumentException("Expected OperationEval subclass");
 		}
@@ -125,7 +137,7 @@ final class OperationEvaluatorFactory {
 		}
 		m.put(ptgClass, constructor);
 	}
-	
+
 	/**
 	 * returns the OperationEval concrete impl instance corresponding
 	 * to the supplied operationPtg
@@ -134,9 +146,16 @@ final class OperationEvaluatorFactory {
 		if(ptg == null) {
 			throw new IllegalArgumentException("ptg must not be null");
 		}
+		Object result;
 		
 		Class ptgClass = ptg.getClass();
 		
+		result = _instancesByPtgClass.get(ptgClass);
+		if (result != null) {
+			return (OperationEval) result;
+		}
+		
+		
 		Constructor constructor = (Constructor) _constructorsByPtgClass.get(ptgClass);
 		if(constructor == null) {
 			if(ptgClass == ExpPtg.class) {
@@ -147,7 +166,6 @@ final class OperationEvaluatorFactory {
 			throw new RuntimeException("Unexpected operation ptg class (" + ptgClass.getName() + ")");
 		}
 		
-		Object result;
 		Object[] initargs = { ptg };
 		try {
 			result = constructor.newInstance(initargs);

src/testcases/org/apache/poi/hssf/record/formula/eval/AllFormulaEvalTests.java

@@ -31,6 +31,7 @@ public class AllFormulaEvalTests {
 		TestSuite result = new TestSuite(AllFormulaEvalTests.class.getName());
 		result.addTestSuite(TestAreaEval.class);
 		result.addTestSuite(TestCircularReferences.class);
+		result.addTestSuite(TestEqualEval.class);
 		result.addTestSuite(TestExternalFunction.class);
 		result.addTestSuite(TestFormulaBugs.class);
 		result.addTestSuite(TestFormulasFromSpreadsheet.class);

src/testcases/org/apache/poi/hssf/record/formula/eval/TestEqualEval.java

@@ -0,0 +1,69 @@
+/* ====================================================================
+   Licensed to the Apache Software Foundation (ASF) under one or more
+   contributor license agreements.  See the NOTICE file distributed with
+   this work for additional information regarding copyright ownership.
+   The ASF licenses this file to You under the Apache License, Version 2.0
+   (the "License"); you may not use this file except in compliance with
+   the License.  You may obtain a copy of the License at
+
+       http://www.apache.org/licenses/LICENSE-2.0
+
+   Unless required by applicable law or agreed to in writing, software
+   distributed under the License is distributed on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+   See the License for the specific language governing permissions and
+   limitations under the License.
+==================================================================== */
+
+package org.apache.poi.hssf.record.formula.eval;
+
+import junit.framework.AssertionFailedError;
+import junit.framework.TestCase;
+
+import org.apache.poi.hssf.record.formula.functions.EvalFactory;
+
+/**
+ * Test for unary plus operator evaluator.
+ *
+ * @author Josh Micich
+ */
+public final class TestEqualEval extends TestCase {
+
+	/**
+	 * Test for bug observable at svn revision 692218 (Sep 2008)<br/>
+	 * The value from a 1x1 area should be taken immediately, regardless of srcRow and srcCol
+	 */
+	public void test1x1AreaOperand() {
+ 
+		ValueEval[] values = { BoolEval.FALSE, };
+		Eval[] args = {
+			EvalFactory.createAreaEval("B1:B1", values),
+			BoolEval.FALSE,
+		};
+		Eval result = EqualEval.instance.evaluate(args, 10, (short)20);
+		if (result instanceof ErrorEval) {
+			if (result == ErrorEval.VALUE_INVALID) {
+				throw new AssertionFailedError("Identified bug in evaluation of 1x1 area");
+			}
+		}
+		assertEquals(BoolEval.class, result.getClass());
+		assertTrue(((BoolEval)result).getBooleanValue());
+	}
+	/**
+	 * Empty string is equal to blank
+	 */
+	public void testBlankEqualToEmptyString() {
+		 
+		Eval[] args = {
+			new StringEval(""),
+			BlankEval.INSTANCE,
+		};
+		Eval result = EqualEval.instance.evaluate(args, 10, (short)20);
+		assertEquals(BoolEval.class, result.getClass());
+		BoolEval be = (BoolEval) result;
+		if (!be.getBooleanValue()) {
+			throw new AssertionFailedError("Identified bug blank/empty string equality");
+		}
+		assertTrue(be.getBooleanValue());
+	}
+}