/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*
* Free Software Foundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Alex Rojkov
*/
package com.caucho.el;
import com.caucho.jsp.el.JspELParser;
import com.caucho.util.L10N;
import javax.el.ExpressionFactory;
import javax.el.ELException;
import javax.el.MethodExpression;
import javax.el.ELContext;
import javax.el.ValueExpression;
import java.util.Properties;
import java.util.HashMap;
import java.math.BigDecimal;
import java.math.BigInteger;
public class ExpressionFactoryImpl extends ExpressionFactory {
private static final HashMap<Class<?>, CoerceType> _coerceMap
= new HashMap<Class<?>, CoerceType>();
protected static final L10N L = new L10N(ExpressionFactoryImpl.class);
public ExpressionFactoryImpl() {
}
public ExpressionFactoryImpl(Properties properties)
{
}
@Override
public Object coerceToType(Object obj, Class<?> targetType)
throws ELException
{
return Expr.coerceToType(obj, targetType);
}
@Override
public MethodExpression
createMethodExpression(ELContext context,
String expression,
Class<?> expectedReturnType,
Class<?> []expectedParamTypes)
throws ELException
{
JspELParser parser = new JspELParser(context, expression, true);
Expr expr = parser.parse();
return new MethodExpressionImpl(expr, expression,
expectedReturnType,
expectedParamTypes);
}
@Override
public ValueExpression
createValueExpression(ELContext context,
String expression,
Class<?> expectedType)
throws ELException
{
if (expectedType == null)
throw new NullPointerException(L.l("expectedType can't be null"));
JspELParser parser = new JspELParser(context, expression);
Expr expr = parser.parse();
return createValueExpression(expr, expression, expectedType);
}
@Override
public ValueExpression
createValueExpression(Object instance,
Class<?> expectedType)
throws ELException
{
if (expectedType == null)
throw new NullPointerException(L.l("expectedType can't be null"));
return new ObjectLiteralValueExpression(instance, expectedType);
}
public ValueExpression createValueExpression(Expr expr,
String expression,
Class<?> expectedType)
{
CoerceType type = _coerceMap.get(expectedType);
if (type == null)
return new ObjectValueExpression(expr, expression, expectedType);
switch (type) {
case BOOLEAN:
return new BooleanValueExpression(expr, expression, expectedType);
case CHARACTER:
return new CharacterValueExpression(expr, expression, expectedType);
case BYTE:
return new ByteValueExpression(expr, expression, expectedType);
case SHORT:
return new ShortValueExpression(expr, expression, expectedType);
case INTEGER:
return new IntegerValueExpression(expr, expression, expectedType);
case LONG:
return new LongValueExpression(expr, expression, expectedType);
case FLOAT:
return new FloatValueExpression(expr, expression, expectedType);
case DOUBLE:
return new DoubleValueExpression(expr, expression, expectedType);
case STRING:
return new StringValueExpression(expr, expression, expectedType);
case BIG_DECIMAL:
return new BigDecimalValueExpression(expr, expression, expectedType);
case BIG_INTEGER:
return new BigIntegerValueExpression(expr, expression, expectedType);
}
return new ObjectValueExpression(expr, expression, expectedType);
}
private enum CoerceType {
BOOLEAN,
CHARACTER,
STRING,
INTEGER,
DOUBLE,
LONG,
FLOAT,
SHORT,
BYTE,
BIG_INTEGER,
BIG_DECIMAL,
VOID
}
static {
_coerceMap.put(boolean.class, CoerceType.BOOLEAN);
_coerceMap.put(Boolean.class, CoerceType.BOOLEAN);
_coerceMap.put(byte.class, CoerceType.BYTE);
_coerceMap.put(Byte.class, CoerceType.BYTE);
_coerceMap.put(short.class, CoerceType.SHORT);
_coerceMap.put(Short.class, CoerceType.SHORT);
_coerceMap.put(int.class, CoerceType.INTEGER);
_coerceMap.put(Integer.class, CoerceType.INTEGER);
_coerceMap.put(long.class, CoerceType.LONG);
_coerceMap.put(Long.class, CoerceType.LONG);
_coerceMap.put(float.class, CoerceType.FLOAT);
_coerceMap.put(Float.class, CoerceType.FLOAT);
_coerceMap.put(double.class, CoerceType.DOUBLE);
_coerceMap.put(Double.class, CoerceType.DOUBLE);
_coerceMap.put(char.class, CoerceType.CHARACTER);
_coerceMap.put(Character.class, CoerceType.CHARACTER);
_coerceMap.put(String.class, CoerceType.STRING);
_coerceMap.put(BigDecimal.class, CoerceType.BIG_DECIMAL);
_coerceMap.put(BigInteger.class, CoerceType.BIG_INTEGER);
_coerceMap.put(void.class, CoerceType.VOID);
}
}