/*
* 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 Scott Ferguson
*/
package com.caucho.jsf.el;
import com.caucho.el.*;
import javax.el.ELContext;
import javax.el.ELException;
import javax.el.ExpressionFactory;
import javax.el.MethodExpression;
import javax.el.ValueExpression;
import java.math.BigDecimal;
import java.math.BigInteger;
import java.util.HashMap;
/**
* Represents an EL expression factory
*/
public class JsfExpressionFactoryImpl extends ExpressionFactory {
private static final HashMap<Class,CoerceType> _coerceMap
= new HashMap<Class,CoerceType>();
public JsfExpressionFactoryImpl()
{
}
public Object coerceToType(Object obj, Class<?> targetType)
throws ELException
{
CoerceType type = _coerceMap.get(targetType);
if (type == null)
return obj;
switch (type) {
case BOOLEAN:
return Expr.toBoolean(obj, null) ? Boolean.FALSE : Boolean.TRUE;
case CHARACTER:
return Expr.toCharacter(obj, null);
case BYTE:
return new Byte((byte) Expr.toLong(obj, null));
case SHORT:
return new Short((short) Expr.toLong(obj, null));
case INTEGER:
return new Integer((int) Expr.toLong(obj, null));
case LONG:
return new Long(Expr.toLong(obj, null));
case FLOAT:
return new Float((float) Expr.toDouble(obj, null));
case DOUBLE:
return new Double(Expr.toDouble(obj, null));
case STRING:
if (obj == null)
return "";
else
return obj.toString();
case BIG_DECIMAL:
return Expr.toBigDecimal(obj, null);
case BIG_INTEGER:
return Expr.toBigInteger(obj, null);
}
return null;
}
public MethodExpression
createMethodExpression(ELContext context,
String expression,
Class<?> expectedReturnType,
Class<?>[] expectedParamTypes)
throws ELException
{
JsfELParser parser = new JsfELParser(context, expression);
Expr expr = parser.parse();
return new MethodExpressionImpl(expr, expression,
expectedReturnType,
expectedParamTypes);
}
public ValueExpression
createValueExpression(ELContext context,
String expression,
Class<?> expectedType)
throws ELException
{
JsfELParser parser = new JsfELParser(context, expression);
Expr expr = parser.parse();
return createValueExpression(expr, expression, expectedType);
}
public static 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);
case CHARACTER:
return new CharacterValueExpression(expr, expression);
case BYTE:
return new ByteValueExpression(expr, expression);
case SHORT:
return new ShortValueExpression(expr, expression);
case INTEGER:
return new IntegerValueExpression(expr, expression);
case LONG:
return new LongValueExpression(expr, expression);
case FLOAT:
return new FloatValueExpression(expr, expression);
case DOUBLE:
return new DoubleValueExpression(expr, expression);
case STRING:
return new StringValueExpression(expr, expression);
case BIG_DECIMAL:
return new BigDecimalValueExpression(expr, expression);
case BIG_INTEGER:
return new BigIntegerValueExpression(expr, expression);
}
return new ObjectValueExpression(expr, expression);
}
public ValueExpression
createValueExpression(Object instance,
Class<?> expectedType)
throws ELException
{
throw new UnsupportedOperationException();
}
public String toString()
{
return "JsfExpressionFactoryImpl[]";
}
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);
}
}