org.directwebremoting.impl.ContainerMap Maven / Gradle / Ivy

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DWR is easy Ajax for Java. It makes it simple to call Java code directly from Javascript. It gets rid of almost all the boiler plate code between the web browser and your Java code.
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/*
 * Copyright 2005 Joe Walker
 *
 * Licensed 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.directwebremoting.impl;

import java.util.AbstractMap;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;

import org.directwebremoting.Container;

/**
 * A {@link Map} that uses a {@link Container} as it's source of data.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class ContainerMap extends AbstractMap implements Map
{
    /**
     * Create a ContainerMap with a Container to proxy requests to
     * @param container The Container that we proxy to
     * @param filterNonStringValues Does the map include created beans?
     */
    public ContainerMap(Container container, boolean filterNonStringValues)
    {
        this.container = container;
        this.filterNonStringValues = filterNonStringValues;
    }

    /**
     * Read the {@link Container} and cache the values
     */
    private void init()
    {
        if (proxy == null)
        {
            proxy = new HashMap();
            for (String name : container.getBeanNames())
            {
                Object value = container.getBean(name);
                if (!filterNonStringValues || value instanceof String)
                {
                    proxy.put(name, value);
                }
            }
        }
    }

    /* (non-Javadoc)
     * @see java.util.AbstractMap#get(java.lang.Object)
     */
    @Override
    public Object get(Object key)
    {
        init();
        return proxy.get(key);
    }

    /* (non-Javadoc)
     * @see java.util.AbstractMap#entrySet()
     */
    @Override
    public Set> entrySet()
    {
        init();
        return proxy.entrySet();
    }

    /* (non-Javadoc)
     * @see java.util.AbstractMap#containsKey(java.lang.Object)
     */
    @Override
    public boolean containsKey(Object key)
    {
        init();
        return proxy.containsKey(key);
    }

    /* (non-Javadoc)
     * @see java.util.AbstractMap#containsValue(java.lang.Object)
     */
    @Override
    public boolean containsValue(Object value)
    {
        init();
        return proxy.containsValue(value);
    }

    /* (non-Javadoc)
     * @see java.util.AbstractMap#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object o)
    {
        if (null == o)
        {
            return false;
        }
        if (this == o)
        {
            return true;
        }

        init();

        if (o.getClass() != this.getClass())
        {
            return false;
        }

        return proxy.equals(o);
    }

    /* (non-Javadoc)
     * @see java.util.AbstractMap#hashCode()
     */
    @Override
    public int hashCode()
    {
        init();
        return proxy.hashCode();
    }

    /* (non-Javadoc)
     * @see java.util.AbstractMap#isEmpty()
     */
    @Override
    public boolean isEmpty()
    {
        init();
        return proxy.isEmpty();
    }

    /* (non-Javadoc)
     * @see java.util.AbstractMap#keySet()
     */
    @Override
    public Set keySet()
    {
        init();
        return proxy.keySet();
    }

    /* (non-Javadoc)
     * @see java.util.AbstractMap#size()
     */
    @Override
    public int size()
    {
        init();
        return proxy.size();
    }

    /* (non-Javadoc)
     * @see java.util.AbstractMap#values()
     */
    @Override
    public Collection