org.directwebremoting.servlet.InterfaceHandler 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 java.io.PrintWriter;

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

import org.directwebremoting.extend.Handler;
import org.directwebremoting.extend.Remoter;
import org.directwebremoting.util.LocalUtil;
import org.directwebremoting.util.MimeConstants;

/**
 * A handler for interface generation requests
 * @author Joe Walker [joe at getahead dot ltd dot uk]
 */
public class InterfaceHandler implements Handler
{
    /* (non-Javadoc)
     * @see org.directwebremoting.Handler#handle(javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    public void handle(HttpServletRequest request, HttpServletResponse response) throws IOException
    {
        String scriptName = request.getPathInfo();
        scriptName = LocalUtil.replace(scriptName, interfaceHandlerUrl, "");
        scriptName = LocalUtil.replace(scriptName, PathConstants.EXTENSION_JS, "");
        if (!LocalUtil.isJavaIdentifier(scriptName))
        {
            throw new SecurityException("Script names may only contain Java Identifiers");
        }

        String path = request.getContextPath() + request.getServletPath();

        String script = remoter.generateInterfaceScript(scriptName, path);

        // Officially we should use MimeConstants.MIME_JS, but if we cheat and
        // use MimeConstants.MIME_PLAIN then it will be easier to read in a
        // browser window, and will still work just fine.
        response.setContentType(MimeConstants.MIME_PLAIN);
        PrintWriter out = response.getWriter();
        out.print(script);
    }

    /**
     * Setter for the remoter
     * @param remoter
     */
    public void setRemoter(Remoter remoter)
    {
        this.remoter = remoter;
    }

    /**
     * The bean to execute remote requests and generate interfaces
     */
    protected Remoter remoter = null;

    /**
     * Setter for the URL that this handler available on
     * @param interfaceHandlerUrl the interfaceHandlerUrl to set
     */
    public void setInterfaceHandlerUrl(String interfaceHandlerUrl)
    {
        this.interfaceHandlerUrl = interfaceHandlerUrl;
    }

    /**
     * What URL is this handler available on?
     */
    protected String interfaceHandlerUrl;
}