release13.07/framework/webapp/src/org/ofbiz/webapp/view/FopPdfViewHandler.java

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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
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package org.ofbiz.webapp.view;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.Reader;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamSource;

import org.ofbiz.base.util.Debug;
import org.ofbiz.base.util.GeneralException;

/**
 * Uses XSL-FO formatted templates to generate PDF views
 * This handler will use JPublish to generate the XSL-FO
 */
public class FopPdfViewHandler extends JPublishViewHandler {

    public static final String module = FopPdfViewHandler.class.getName();

    /**
     * @see org.ofbiz.webapp.view.ViewHandler#render(java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String, javax.servlet.http.HttpServletRequest, javax.servlet.http.HttpServletResponse)
     */
    public void render(String name, String page, String info, String contentType, String encoding, HttpServletRequest request, HttpServletResponse response) throws ViewHandlerException {
        // render and obtain the XSL-FO
        Writer writer = new StringWriter();
        try {
            wrapper.render(page, request, response, writer, null, false);
        } catch (Throwable t) {
            throw new ViewHandlerException("Problems with the response writer/output stream", t);
        }
        if (Debug.verboseOn()) {
            Debug.logVerbose("XSL-FO : " + writer.toString(), module);
        }

        // render the byte array
        ByteArrayOutputStream out = null;
        Reader reader = new StringReader(writer.toString());
        Source src = new StreamSource(reader);
        try {
            ApacheFopWorker.transform(src, out, null, contentType);
        } catch (GeneralException e) {
            throw new ViewHandlerException(e.getMessage(), e.getNested());
        }

        // set the content type and length
        response.setContentType(contentType);
        response.setContentLength(out.size());

        // write to the browser
        try {
            out.writeTo(response.getOutputStream());
            response.getOutputStream().flush();
        } catch (IOException e) {
            throw new ViewHandlerException("Unable write to browser OutputStream", e);
        }
    }
}