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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.Collection;

import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;

import org.directwebremoting.Container;
import org.directwebremoting.ServerContext;
import org.directwebremoting.extend.ConverterManager;
import org.directwebremoting.extend.ScriptSessionManager;
import org.directwebremoting.util.VersionUtil;

/**
 * The Default implementation of ServerContext
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class DefaultServerContext implements ServerContext
{
    /**
     * Build a new DefaultServerContext
     * @param config The servlet configuration
     * @param context The servlet context
     * @param container The IoC container
     */
    public DefaultServerContext(ServletConfig config, ServletContext context, Container container)
    {
        this.config = config;
        this.context = context;
        this.container = container;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.ServerContext#getAllScriptSessions()
     */
    public Collection getAllScriptSessions()
    {
        return getScriptSessionManager().getAllScriptSessions();
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.ServerContext#getContainer()
     */
    public Container getContainer()
    {
        return container;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.ServerContext#getScriptSessionsByPage(java.lang.String)
     */
    public Collection getScriptSessionsByPage(String otherPage)
    {
        return getScriptSessionManager().getScriptSessionsByPage(otherPage);
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.ServerContext#getServletConfig()
     */
    public ServletConfig getServletConfig()
    {
        return config;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.ServerContext#getServletContext()
     */
    public ServletContext getServletContext()
    {
        return context;
    }

    /* (non-Javadoc)
     * @see org.directwebremoting.WebContext#getVersion()
     */
    public String getVersion()
    {
        return VersionUtil.getVersion();
    }

    /**
     * Internal helper for getting at a ScriptSessionManager
     * @return Our ScriptSessionManager
     */
    protected ScriptSessionManager getScriptSessionManager()
    {
        if (sessionManager == null)
        {
            sessionManager = (ScriptSessionManager) container.getBean(ScriptSessionManager.class.getName());
        }

        return sessionManager;
    }

    /**
     * Internal helper for getting at a ConverterManager
     * @return Our ConverterManager
     */
    protected ConverterManager getConverterManager()
    {
        if (converterManager == null)
        {
            converterManager = (ConverterManager) container.getBean(ConverterManager.class.getName());
        }

        return converterManager;
    }

    /**
     * The ServletConfig associated with the current request
     */
    private ServletConfig config = null;

    /**
     * The ServletContext associated with the current request
     */
    private ServletContext context = null;

    /**
     * The Ioc container implementation
     */
    private Container container = null;

    /**
     * The session manager for sessions keyed off script ids
     */
    private ScriptSessionManager sessionManager = null;

    /**
     * How we convert to Javascript objects
     */
    private ConverterManager converterManager = null;
}