rtfdiskcache.java

来自「有关对pdf操作的代码」· Java 代码 · 共 114 行

/*
 * $Id: RtfDiskCache.java 3117 2008-01-31 05:53:22Z xlv $
 * $Name$
 *
 * Copyright 2005 by Mark Hall
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the ?GNU LIBRARY GENERAL PUBLIC LICENSE?), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */

package com.lowagie.text.rtf.document.output;

import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;


/**
 * The RtfFileCache is a RtfDataCache that uses a temporary file
 * to store the rtf document data. Not so fast, but doesn't use any
 * memory (just disk space).
 * 
 * @version $Revision: 3117 $
 * @author Mark Hall ([e-mail])
 */
public class RtfDiskCache implements RtfDataCache {

    /**
     * The BufferedOutputStream that stores the cache data.
     */
    private BufferedOutputStream data = null;
    /**
     * The temporary file to store the data in.
     */
    private File tempFile = null;
    
    /**
     * Constructs a RtfFileCache. Creates the temp file.
     * 
     * @throws IOException If the temporary file could not be created.
     */
    public RtfDiskCache() throws IOException {
        this.tempFile = File.createTempFile("iText", null);
        this.data = new BufferedOutputStream(new FileOutputStream(tempFile));
    }

    /**
     * Gets the BufferedOutputStream to write to.
     */
    public OutputStream getOutputStream() {
        return this.data;
    }

    /**
     * Writes the content of the temporary file into the OutputStream.
     */
    public void writeTo(OutputStream target) throws IOException {
        this.data.close();
        BufferedInputStream tempIn = new BufferedInputStream(new FileInputStream(this.tempFile));
        byte[] buffer = new byte[8192];
        int bytesRead = -1;
        while((bytesRead = tempIn.read(buffer)) >= 0) {
            target.write(buffer, 0, bytesRead);
        }
        tempIn.close();
        this.tempFile.delete();
    }

}