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/*
* Copyright (c) 1998-2012 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 com.caucho.util.L10N;
import javax.el.ELContext;
import javax.el.ELException;
import javax.el.PropertyNotFoundException;
import javax.el.PropertyNotWritableException;
import javax.el.ValueExpression;
import java.util.logging.Logger;
/**
* Abstract implementation class for an expression.
*/
abstract public class AbstractValueExpression extends ValueExpression
{
protected static final Logger log
= Logger.getLogger(AbstractValueExpression.class.getName());
protected static final L10N L = new L10N(AbstractValueExpression.class);
protected final Expr _expr;
private final String _expressionString;
protected AbstractValueExpression()
{
_expr = null;
_expressionString = "";
}
protected AbstractValueExpression(Expr expr,
String expressionString)
{
_expr = expr;
_expressionString = expressionString;
}
protected AbstractValueExpression(Expr expr)
{
_expr = expr;
if (_expr != null)
_expressionString = _expr.toString();
else
_expressionString = "";
}
public boolean isLiteralText()
{
return _expr.isLiteralText();
}
public String getExpressionString()
{
return _expressionString;
}
abstract public Class> getExpectedType();
public Class> getType(ELContext context)
throws PropertyNotFoundException,
ELException
{
if (context == null)
throw new NullPointerException("context can't be null");
Object value = getValue(context);
if (value == null)
return null;
else
return value.getClass();
}
@Override
public Object getValue(ELContext context)
throws PropertyNotFoundException,
ELException
{
if (context == null)
throw new NullPointerException("context can't be null");
return _expr.getValue(context);
}
@Override
public boolean isReadOnly(ELContext context)
throws PropertyNotFoundException,
ELException
{
if (context == null)
throw new NullPointerException("context can't be null");
return _expr.isReadOnly(context);
}
public void setValue(ELContext context, Object value)
throws PropertyNotFoundException,
PropertyNotWritableException,
ELException
{
if (context == null)
throw new NullPointerException("context can't be null");
_expr.setValue(context, value);
}
public int hashCode()
{
return _expr.hashCode();
}
public boolean equals(Object o)
{
if (this == o)
return true;
else if (! (o instanceof AbstractValueExpression))
return false;
AbstractValueExpression expr = (AbstractValueExpression) o;
return _expr.equals(expr._expr);
}
public String toString()
{
String name = getClass().getName();
int p = name.lastIndexOf('.');
name = name.substring(p + 1);
return name + "[" + getExpressionString() + "]";
}
}