/*
* 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.el;
import javax.el.ELContext;
import javax.el.ELException;
import java.util.HashMap;
/**
* Marshalls an expression.
*/
abstract public class Marshall {
private static final HashMap<Class,Marshall> ARG_MAP
= new HashMap<Class,Marshall>();
public static Marshall create(Class arg)
{
Marshall marshall = ARG_MAP.get(arg);
if (marshall != null)
return marshall;
else
return OBJECT;
}
abstract public Object marshall(Expr expr, ELContext env)
throws ELException;
public static final Marshall BOOLEAN = new Marshall() {
public Object marshall(Expr expr, ELContext env)
throws ELException
{
return new Boolean((boolean) expr.evalBoolean(env));
}
};
public static final Marshall BYTE = new Marshall() {
public Object marshall(Expr expr, ELContext env)
throws ELException
{
return new Byte((byte) expr.evalLong(env));
}
};
public static final Marshall SHORT = new Marshall() {
public Object marshall(Expr expr, ELContext env)
throws ELException
{
return new Short((short) expr.evalLong(env));
}
};
public static final Marshall INTEGER = new Marshall() {
public Object marshall(Expr expr, ELContext env)
throws ELException
{
return new Integer((int) expr.evalLong(env));
}
};
public static final Marshall LONG = new Marshall() {
public Object marshall(Expr expr, ELContext env)
throws ELException
{
return new Long(expr.evalLong(env));
}
};
public static final Marshall FLOAT = new Marshall() {
public Object marshall(Expr expr, ELContext env)
throws ELException
{
return new Float((float) expr.evalDouble(env));
}
};
public static final Marshall DOUBLE = new Marshall() {
public Object marshall(Expr expr, ELContext env)
throws ELException
{
return new Double(expr.evalDouble(env));
}
};
public static final Marshall STRING = new Marshall() {
public Object marshall(Expr expr, ELContext env)
throws ELException
{
return expr.evalString(env);
}
};
public static final Marshall CHARACTER = new Marshall() {
public Object marshall(Expr expr, ELContext env)
throws ELException
{
String s = expr.evalString(env);
if (s == null || s.length() == 0)
return null;
else
return new Character(s.charAt(0));
}
};
public static final Marshall OBJECT = new Marshall() {
public Object marshall(Expr expr, ELContext env)
throws ELException
{
return expr.getValue(env);
}
};
static {
ARG_MAP.put(boolean.class, BOOLEAN);
ARG_MAP.put(Boolean.class, BOOLEAN);
ARG_MAP.put(byte.class, BYTE);
ARG_MAP.put(Byte.class, BYTE);
ARG_MAP.put(short.class, SHORT);
ARG_MAP.put(Short.class, SHORT);
ARG_MAP.put(int.class, INTEGER);
ARG_MAP.put(Integer.class, INTEGER);
ARG_MAP.put(long.class, LONG);
ARG_MAP.put(Long.class, LONG);
ARG_MAP.put(float.class, FLOAT);
ARG_MAP.put(Float.class, FLOAT);
ARG_MAP.put(double.class, DOUBLE);
ARG_MAP.put(Double.class, DOUBLE);
ARG_MAP.put(char.class, CHARACTER);
ARG_MAP.put(Character.class, CHARACTER);
ARG_MAP.put(String.class, STRING);
}
}