org.directwebremoting.servlet.JavaScriptHandler 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.servlet;

import java.io.IOException;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.directwebremoting.util.JavascriptUtil;
import org.directwebremoting.util.MimeConstants;

/**
 * Basically a file servlet component that does some very limited
 * EL type processing on the file. See the source for the cheat.
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public abstract class JavaScriptHandler extends TemplateHandler
{
    /* (non-Javadoc)
     * @see org.directwebremoting.servlet.CachingFileHandler#generate(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    @Override
    protected String generateCachableContent(HttpServletRequest request, HttpServletResponse response) throws IOException
    {
        String output = super.generateCachableContent(request, response);

        if (getMimeType().equals(MimeConstants.MIME_JS) && scriptCompressed)
        {
            output = JavascriptUtil.compress(output, compressionLevel);
        }

        return output;
    }

    /**
     * To what level do we compress scripts?
     * @param scriptCompressed The scriptCompressed to set.
     */
    public void setScriptCompressed(boolean scriptCompressed)
    {
        this.scriptCompressed = scriptCompressed;
    }

    /**
     * @param compressionLevel The compressionLevel to set.
     */
    public void setCompressionLevel(int compressionLevel)
    {
        this.compressionLevel = compressionLevel;
    }

    /**
     * How much do we compression javascript by?
     */
    protected int compressionLevel = JavascriptUtil.LEVEL_DEBUGGABLE;

    /**
     * Do we retain comments and unneeded spaces in Javascript code?
     */
    private boolean scriptCompressed = false;
}