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

Go to download
Show more of this group Show more artifacts with this name
Show all versions of dwr Show documentation
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.
There is a newer version: 3.0.2-RELEASE
Show newest version
/*
 * 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.Iterator;
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 (Iterator it = container.getBeanNames().iterator(); it.hasNext();)
            {
                String name = (String) it.next();
                Object value = container.getBean(name);

                if (!filterNonStringValues || value instanceof String)
                {
                    proxy.put(name, value);
                }
            }
        }
    }

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

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

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

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

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

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

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

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

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

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

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

    /* (non-Javadoc)
     * @see java.util.AbstractMap#put(java.lang.Object, java.lang.Object)
     */
    public Object put(Object key, Object value)
    {
        throw new UnsupportedOperationException("ContainerMaps are read only");
    }

    /* (non-Javadoc)
     * @see java.util.AbstractMap#putAll(java.util.Map)
     */
    public void putAll(Map t)
    {
        throw new UnsupportedOperationException("ContainerMaps are read only");
    }

    /* (non-Javadoc)
     * @see java.util.AbstractMap#remove(java.lang.Object)
     */
    public Object remove(Object key)
    {
        throw new UnsupportedOperationException("ContainerMaps are read only");
    }

    /* (non-Javadoc)
     * @see java.util.AbstractMap#clear()
     */
    public void clear()
    {
        throw new UnsupportedOperationException("ContainerMaps are read only");
    }

    /**
     * Are we filtering non-string values from the container
     */
    private boolean filterNonStringValues;

    /**
     * The Container that we proxy to.
     */
    private Container container;

    /**
     * The cache of filtered values
     */
    protected Map proxy;
}