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JdbcMapper
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JdbcMapper/querymapper/src/main/java/com/moparisthebest/jdbc/CompilingRowToObjectMapper....

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package com.moparisthebest.jdbc;
import com.moparisthebest.classgen.Compiler;
import javax.lang.model.type.TypeMirror;
import java.io.IOException;
import java.lang.reflect.AccessibleObject;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.Calendar;
import java.util.Map;
/**
* Map a ResultSet row to an Object. This mapper generates/compiles/executes java code to perform the mapping.
*
* @author Travis Burtrum (modifications from beehive)
* @author Travis Burtrum
* @see RowToObjectMapper for most details, will document here where this differs
* <p>
* Usage differences:
* 1. Reflection can set non-public or final fields directly, direct java code cannot, so DTOs like that will result in
* a compilation and therefore mapping error.
*/
public class CompilingRowToObjectMapper<K, T> extends RowToObjectMapper<K, T> {
// do not remove, used from generated classes
public static final String firstColumnError = "Cannot call getFirstColumn when mapKeyType is null!";
protected final Compiler compiler;
protected final ResultSetToObject<K, T> resultSetToObject;
public CompilingRowToObjectMapper(final Compiler compiler, final Map<CachingRowToObjectMapper.ResultSetKey, ResultSetToObject<?,?>> cache, ResultSet resultSet, Class<T> returnTypeClass, Calendar cal, Class<?> mapValType, Class<K> mapKeyType) {
this(compiler, cache, resultSet, returnTypeClass, cal, mapValType, mapKeyType, false);
}
public CompilingRowToObjectMapper(final Compiler compiler, final Map<CachingRowToObjectMapper.ResultSetKey, ResultSetToObject<?,?>> cache, ResultSet resultSet, Class<T> returnTypeClass, Calendar cal, Class<?> mapValType, Class<K> mapKeyType, final boolean caseInsensitiveMap) {
super(resultSet, returnTypeClass, cal, mapValType, mapKeyType, caseInsensitiveMap);
this.compiler = compiler;
try {
final CachingRowToObjectMapper.ResultSetKey keys = new CachingRowToObjectMapper.ResultSetKey(super.getKeysFromResultSet(), _returnTypeClass, _mapKeyType);
//System.out.printf("keys: %s\n", keys);
@SuppressWarnings("unchecked")
final ResultSetToObject<K,T> resultSetToObject = (ResultSetToObject<K,T>) cache.get(keys);
if (resultSetToObject == null) {
//System.out.printf("cache miss, keys: %s\n", keys);
// generate and put into cache
cache.put(keys, this.resultSetToObject = genClass());
this.keys = null;
this._fields = null;
this._fieldTypes = null;
this.constructor = null;
} else {
//System.out.printf("cache hit, keys: %s\n", keys);
// load from cache
this.resultSetToObject = resultSetToObject;
}
} catch (SQLException e) {
throw new MapperException("CachingRowToObjectMapper: SQLException: " + e.getMessage(), e);
} catch (IOException e) {
throw new MapperException("CachingRowToObjectMapper: IOException (should never happen?): " + e.getMessage(), e);
}
}
public CompilingRowToObjectMapper(final String[] keys, Class<T> returnTypeClass, Calendar cal, Class<?> mapValType, Class<K> mapKeyType) {
super(keys,null, returnTypeClass, cal, mapValType, mapKeyType, false);
this.compiler = null;
this.resultSetToObject = null;
}
@Override
public T mapRowToReturnType() throws SQLException {
return resultSetToObject.toObject(_resultSet, _cal);
}
@Override
public K getMapKey() throws SQLException {
return resultSetToObject.getFirstColumn(_resultSet, _cal);
}
@Override
protected String[] getKeysFromResultSet() throws SQLException {
if (keys == null)
throw new MapperException("not supported here");
return keys;
}
@Override
protected void getFieldMappings() throws SQLException {
throw new MapperException("not supported here");
}
public interface ResultSetToObject<K, T> {
K getFirstColumn(final ResultSet rs, final Calendar cal) throws SQLException;
T toObject(final ResultSet rs, final Calendar cal) throws SQLException;
}
protected String typeFromName(final Class<?> type) {
if(type == null)
return "Object";
if(_columnCount == 1 && type.isPrimitive()) {
// need the object equivalent here, what is the best way? this works, isn't pretty...
if(type.equals(Character.TYPE))
return "Character";
if(type.equals(Integer.TYPE))
return "Integer";
final char[] name = type.getName().toCharArray();
name[0] = Character.toUpperCase(name[0]);
return new String(name);
} else if (returnMap || componentType == null) {
return type.getName();
} else {
// an array, annoying syntax
final String name = type.getName();
final char charType = name.charAt(1);
switch (charType) {
case 'L':
return name.substring(2, name.length() - 1) + "[]";
case 'Z':
return "boolean[]";
case 'B':
return "byte[]";
case 'C':
return "char[]";
case 'D':
return "double[]";
case 'F':
return "float[]";
case 'I':
return "int[]";
case 'J':
return "long[]";
case 'S':
return "short[]";
case '[':
default:
throw new MapperException("only supports single dimensional array");
}
}
}
public static String escapeMapKeyString(final String s) {
// todo: escape key string, newlines, double quotes, backslashes...
// actually it seems like those wouldn't be valid SQL column names, so we won't bother until we hear different...
return '"' + s + '"';
}
// code generation down here
protected ResultSetToObject<K, T> genClass() throws IOException {
final String className = "CompilingMapper";
final String tType = typeFromName(_returnTypeClass);
final String kType = typeFromName(_mapKeyType);
final String header =
"import static com.moparisthebest.jdbc.util.ResultSetUtil.*;\n\n" +
"public final class " + className +
" implements com.moparisthebest.jdbc.CompilingRowToObjectMapper.ResultSetToObject<"+ kType +"," + tType + "> {\n" +
" public " + tType + " toObject(final java.sql.ResultSet rs, final java.util.Calendar cal) throws java.sql.SQLException {\n";
final String footer = ";\n }\n" +
"}\n";
final StringBuilder java = new StringBuilder(header);
//java.append("return null;\n");
gen(java, tType);
java.append("return ret;\n");
java.append(" }\n\n public ").append(kType).append(" getFirstColumn(final java.sql.ResultSet rs, final java.util.Calendar cal) throws java.sql.SQLException {\n ");
if(_mapKeyType != null){
java.append("return ");
extractColumnValueString(java, 1, _mapKeyType);
} else {
java.append("throw new com.moparisthebest.jdbc.MapperException(com.moparisthebest.jdbc.CompilingRowToObjectMapper.firstColumnError)");
}
java.append(footer);
//System.out.println(java);
return compiler.compile(className, java);
}
public void gen(final Appendable java, final String tType) throws IOException {
if(mapOnlySecondColumn){
java.append("final ").append(tType).append(" ret = ");
extractColumnValueString(java, 2, _tmf.getTypeId(_returnTypeClass));
java.append(";\n");
return;
}
lazyLoadConstructor();
if (resultSetConstructor) {
java.append("final ").append(tType).append(" ret = new ").append(tType).append("(rs);\n");
return;
}
if (returnMap) // we want a map
try {
// todo: does not call getMapImplementation, I think that's fine
java.append("final ").append(tType).append("<String, Object> ret = new ").append(tType).append("<String, Object>();\n");
final int columnLength = _columnCount + 1;
if (componentType != null && componentType != Object.class) { // we want a specific value type
int typeId = _tmf.getTypeId(componentType);
for (int x = 1; x < columnLength; ++x) {
java.append("ret.put(").append(escapeMapKeyString(keys[x]).toLowerCase()).append(", ");
extractColumnValueString(java, x, typeId);
java.append(");\n");
}
} else // we want a generic object type
for (int x = 1; x < columnLength; ++x)
java.append("ret.put(").append(escapeMapKeyString(keys[x].toLowerCase())).append(", rs.getObject(").append(String.valueOf(x)).append("));\n");
return;
} catch (Throwable e) {
throw new MapperException(e.getClass().getName() + " when trying to create a Map<String, "
+ (componentType == null ? "java.lang.Object" : componentType.getName()) + "> from a ResultSet row" +
", all columns must be of the map value type", e);
}
else if (componentType != null) // we want an array
try {
java.append("final ").append(tType).append(" ret = new ").append(tType.substring(0, tType.length() - 1)).append(String.valueOf(_columnCount)).append("];\n");
final int typeId = _tmf.getTypeId(componentType);
for (int x = 0; x < _columnCount; ) {
java.append("ret[").append(String.valueOf(x)).append("] = ");
extractColumnValueString(java, ++x, typeId);
java.append(";\n");
}
return;
} catch (Throwable e) {
throw new MapperException(e.getClass().getName() + " when trying to create a "
+ componentType.getName() + "[] from a ResultSet row, all columns must be of that type", e);
}
// if the ResultSet only contains a single column we may be able to map directly
// to the return type -- if so we don't need to build any structures to support
// mapping
if (_columnCount == 1) {
final int typeId = _tmf.getTypeId(_returnTypeClass);
try {
if (typeId != TypeMappingsFactory.TYPE_UNKNOWN) {
java.append("final ").append(tType).append(" ret = ");
extractColumnValueString(java, 1, typeId);
java.append(";\n");
return;
} else {
// we still might want a single value (i.e. java.util.Date)
/*
Object val = extractColumnValue(1, typeId);
if (_returnTypeClass.isAssignableFrom(val.getClass())) {
return _returnTypeClass.cast(val);
}
*/
// we could actually pull from first row like above and test it first and fail now, but maybe just failing during compilation is enough?
java.append("final ").append(tType).append(" ret = (").append(tType).append(") ");
extractColumnValueString(java, 1, typeId);
java.append(";\n");
return;
}
} catch (Exception e) {
throw new MapperException(e.getMessage(), e);
}
}
if (_fields == null) {
try {
super.getFieldMappings();
} catch (SQLException e) {
throw new MapperException(e.getMessage(), e);
}
}
java.append("final ").append(tType).append(" ret = new ").append(tType).append("();\n");
for (int i = 1; i < _fields.length; i++) {
AccessibleObject f = _fields[i];
//_args[0] = extractColumnValue(i, _fieldTypes[i]);
//System.out.printf("field: '%s' obj: '%s' fieldType: '%s'\n", _fields[i], _args[0], _fieldTypes[i]);
// custom hacked-in support for enums, can do better when we scrap org.apache.beehive.controls.system.jdbc.TypeMappingsFactory
if (_fieldTypes[i] == 0) {
final Class<?> fieldType = f instanceof Field ? ((Field) f).getType() : ((Method) f).getParameterTypes()[0];
if (Enum.class.isAssignableFrom(fieldType)) {
_args[0] = Enum.valueOf((Class<? extends Enum>) fieldType, (String) _args[0]);
if (f instanceof Field) {
// if f not accessible (but super.getFieldMappings() sets it), throw exception during compilation is fine
java.append("ret.").append(((Field) f).getName()).append(" = ").append(typeFromName(fieldType)).append(".valueOf(");
extractColumnValueString(java, i, _fieldTypes[i]);
java.append(");\n");
} else {
java.append("ret.").append(((Method) f).getName()).append("(").append(typeFromName(fieldType)).append(".valueOf(");
extractColumnValueString(java, i, _fieldTypes[i]);
java.append("));\n");
}
}
}
if (f instanceof Field) {
// if f not accessible (but super.getFieldMappings() sets it), throw exception during compilation is fine
java.append("ret.").append(((Field) f).getName()).append(" = ");
extractColumnValueString(java, i, _fieldTypes[i]);
java.append(";\n");
} else {
java.append("ret.").append(((Method) f).getName()).append("(");
extractColumnValueString(java, i, _fieldTypes[i]);
java.append(");\n");
}
}
// if this resultObject is Finishable, call finish()
if (Finishable.class.isAssignableFrom(_returnTypeClass))
java.append("ret.finish(rs);\n");
}
public static void extractColumnValueString(final Appendable java, final int index, final Class resultType) throws IOException {
extractColumnValueString(java, index, _tmf.getTypeId(resultType));
}
/**
* Extract a column value from the ResultSet and return it as resultType.
*
* @param index The column index of the value to extract from the ResultSet.
* @param resultType The return type. Defined in TypeMappingsFactory.
* @return The extracted value
* @throws java.sql.SQLException on error.
*/
public static void extractColumnValueString(final Appendable java, final int index, final int resultType) throws IOException {
switch (resultType) {
case TypeMappingsFactory.TYPE_INT:
java.append("rs.getInt(").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_LONG:
java.append("rs.getLong(").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_FLOAT:
java.append("rs.getFloat(").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_DOUBLE:
java.append("rs.getDouble(").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_BYTE:
java.append("rs.getByte(").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_SHORT:
java.append("rs.getInt(").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_BOOLEAN:
java.append("getBooleanYN(rs, ").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_INT_OBJ:
java.append("getObjectInt(rs, ").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_LONG_OBJ:
java.append("getObjectLong(rs, ").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_FLOAT_OBJ:
java.append("getObjectFloat(rs, ").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_DOUBLE_OBJ:
java.append("getObjectDouble(rs, ").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_BYTE_OBJ:
java.append("getObjectByte(rs, ").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_SHORT_OBJ:
java.append("getObjectShort(rs, ").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_BOOLEAN_OBJ:
java.append("getObjectBooleanYN(rs, ").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_STRING:
case TypeMappingsFactory.TYPE_XMLBEAN_ENUM:
java.append("rs.getString(").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_BIG_DECIMAL:
java.append("rs.getBigDecimal(").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_BYTES:
java.append("rs.getBytes(").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_TIMESTAMP:
java.append("getTimestamp(rs, cal, ").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_TIME:
java.append("getTime(rs, cal, ").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_SQLDATE:
java.append("getSqlDate(rs, cal, ").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_DATE:
java.append("getUtilDate(rs, cal, ").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_CALENDAR:
java.append("getCalendar(rs, cal, ").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_REF:
java.append("rs.getRef(").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_BLOB:
java.append("rs.getBlob(").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_CLOB:
java.append("rs.getClob(").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_ARRAY:
java.append("rs.getArray(").append(String.valueOf(index)).append(")");
return;
case TypeMappingsFactory.TYPE_READER:
case TypeMappingsFactory.TYPE_STREAM:
throw new MapperException("streaming return types are not supported by the JdbcControl; use ResultSet instead");
case TypeMappingsFactory.TYPE_STRUCT:
case TypeMappingsFactory.TYPE_UNKNOWN:
// JAVA_TYPE (could be any), or REF
java.append("rs.getObject(").append(String.valueOf(index)).append(")");
return;
default:
throw new MapperException("internal error: unknown type ID: " + Integer.toString(resultType));
}
}
}
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