Patch from Josh from bug #44608 - Support for PercentPtg in the formula evaluator

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@637600 13f79535-47bb-0310-9956-ffa450edef68

src/scratchpad/src/org/apache/poi/hssf/record/formula/eval/PercentEval.java

@@ -0,0 +1,71 @@
+/* ====================================================================
+   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.PercentPtg;
+import org.apache.poi.hssf.record.formula.Ptg;
+
+/**
+ * Implementation of Excel formula token '%'. <p/>
+ * @author Josh Micich
+ */
+public final class PercentEval extends NumericOperationEval {
+
+	private PercentPtg _delegate;
+
+	private static final ValueEvalToNumericXlator NUM_XLATOR = new ValueEvalToNumericXlator(
+			(short) (ValueEvalToNumericXlator.BOOL_IS_PARSED
+					| ValueEvalToNumericXlator.REF_BOOL_IS_PARSED
+					| ValueEvalToNumericXlator.STRING_IS_PARSED | ValueEvalToNumericXlator.REF_STRING_IS_PARSED));
+
+	public PercentEval(Ptg ptg) {
+		_delegate = (PercentPtg) ptg;
+	}
+
+	protected ValueEvalToNumericXlator getXlator() {
+		return NUM_XLATOR;
+	}
+
+	public Eval evaluate(Eval[] args, int srcRow, short srcCol) {
+		if (args.length != 1) {
+			return ErrorEval.VALUE_INVALID;
+		}
+
+		ValueEval ve = singleOperandEvaluate(args[0], srcRow, srcCol);
+		if (ve instanceof NumericValueEval) {
+			double d0 = ((NumericValueEval) ve).getNumberValue();
+			return new NumberEval(d0 / 100);
+		}
+
+		if (ve instanceof BlankEval) {
+			return NumberEval.ZERO;
+		}
+		if (ve instanceof ErrorEval) {
+			return ve;
+		}
+		return ErrorEval.VALUE_INVALID;
+	}
+
+	public int getNumberOfOperands() {
+		return _delegate.getNumberOfOperands();
+	}
+
+	public int getType() {
+		return _delegate.getType();
+	}
+}