org.apache.myfaces.view.facelets.tag.jstl.core.MappedValueExpression Maven / Gradle / Ivy

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The private implementation classes of the Apache MyFaces Core JSF-2.0 Implementation
There is a newer version: 4.1.0-RC2
/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.myfaces.view.facelets.tag.jstl.core;

import java.io.Serializable;
import java.util.Map;

import javax.el.ELContext;
import javax.el.ValueExpression;

/**
 * @author Jacob Hookom
 * @version $Id: MappedValueExpression.java,v 1.6 2008/07/13 19:01:43 rlubke Exp $
 */
public final class MappedValueExpression extends ValueExpression
{
    private final static class Entry implements Map.Entry, Serializable
    {
        private final Map src;
        private final Object key;

        public Entry(Map src, Object key)
        {
            this.src = src;
            this.key = key;
        }

        public Object getKey()
        {
            return key;
        }

        public Object getValue()
        {
            return src.get(key);
        }

        public Object setValue(Object value)
        {
            return src.put(key, value);
        }

    }

    /**
     * 
     */
    private static final long serialVersionUID = 1L;

    private final Object key;

    private final ValueExpression orig;

    /**
     * 
     */
    public MappedValueExpression(ValueExpression orig, Map.Entry entry)
    {
        this.orig = orig;
        this.key = entry.getKey();
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.ValueExpression#getValue(javax.el.ELContext)
     */
    public Object getValue(ELContext context)
    {
        Object base = this.orig.getValue(context);
        if (base != null)
        {
            context.setPropertyResolved(true);
            return new Entry((Map) base, key);

        }
        return null;
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.ValueExpression#setValue(javax.el.ELContext, java.lang.Object)
     */
    public void setValue(ELContext context, Object value)
    {
        Object base = this.orig.getValue(context);
        if (base != null)
        {
            context.setPropertyResolved(false);
            context.getELResolver().setValue(context, base, key, value);
        }
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.ValueExpression#isReadOnly(javax.el.ELContext)
     */
    public boolean isReadOnly(ELContext context)
    {
        Object base = this.orig.getValue(context);
        if (base != null)
        {
            context.setPropertyResolved(false);
            return context.getELResolver().isReadOnly(context, base, key);
        }
        return true;
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.ValueExpression#getType(javax.el.ELContext)
     */
    public Class getType(ELContext context)
    {
        Object base = this.orig.getValue(context);
        if (base != null)
        {
            context.setPropertyResolved(false);
            return context.getELResolver().getType(context, base, key);
        }
        return null;
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.ValueExpression#getExpectedType()
     */
    public Class getExpectedType()
    {
        return Object.class;
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.Expression#getExpressionString()
     */
    public String getExpressionString()
    {
        return this.orig.getExpressionString();
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.Expression#equals(java.lang.Object)
     */
    public boolean equals(Object obj)
    {
        return this.orig.equals(obj);
    }

    /*
     * (non-Javadoc)
     * 
     * @see javax.el.Expression#hashCode()
     */
    public int hashCode()
    {
        // TODO Auto-generated method stub
        return 0;
    }

    /*
     * (non-Javadoc)eturn new Map.Entry
     * 
     * @see javax.el.Expression#isLiteralText()
     */
    public boolean isLiteralText()
    {
        // TODO Auto-generated method stub
        return false;
    }

}