alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Struts example source code file (ValueStackShadowMap.java)

This example Struts source code file (ValueStackShadowMap.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Struts tags/keywords

hashmap, object, object, set, string, string, util, valuestack, valuestack, valuestackshadowmap, valuestackshadowmap

The Struts ValueStackShadowMap.java source code

/*
 * $Id: ValueStackShadowMap.java 651946 2008-04-27 13:41:38Z apetrelli $
 *
 * 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.struts2.views.jasperreports;

import com.opensymphony.xwork2.util.ValueStack;

import java.util.HashMap;
import java.util.Set;


/**
 * Ported to Struts:
 *
 */
public class ValueStackShadowMap extends HashMap {

    private static final long serialVersionUID = -167109778490907240L;

    /**
     * valueStack reference
     */
    ValueStack valueStack;

    /**
     * entries reference
     */
    Set entries;


    /**
     * Constructs an instance of ValueStackShadowMap.
     *
     * @param valueStack - the underlying valuestack
     */
    public ValueStackShadowMap(ValueStack valueStack) {
        this.valueStack = valueStack;
    }


    /**
     * Implementation of containsKey(), overriding HashMap implementation.
     *
     * @param key - The key to check in HashMap and if not found to check on valueStack.
     * @return <tt>true, if conatins key, false otherwise.
     * @see java.util.HashMap#containsKey
     */
    public boolean containsKey(Object key) {
        boolean hasKey = super.containsKey(key);

        if (!hasKey) {
            if (valueStack.findValue((String) key) != null) {
                hasKey = true;
            }
        }

        return hasKey;
    }

    /**
     * Implementation of get(), overriding HashMap implementation.
     *
     * @param key - The key to get in HashMap and if not found there from the valueStack.
     * @return value - The object from HashMap or if null, from the valueStack.
     * @see java.util.HashMap#get
     */
    public Object get(Object key) {
        Object value = super.get(key);

        if ((value == null) && key instanceof String) {
            value = valueStack.findValue((String) key);
        }

        return value;
    }
}

Other Struts examples (source code examples)

Here is a short list of links related to this Struts ValueStackShadowMap.java source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.