001: /*
002: * $Id: MultipleUrlsReader.java,v 1.3 2002/04/26 05:23:11 skavish Exp $
003: *
004: * ===========================================================================
005: *
006: * The JGenerator Software License, Version 1.0
007: *
008: * Copyright (c) 2000 Dmitry Skavish (skavish@usa.net). All rights reserved.
009: *
010: * Redistribution and use in source and binary forms, with or without
011: * modification, are permitted provided that the following conditions are met:
012: *
013: * 1. Redistributions of source code must retain the above copyright
014: * notice, this list of conditions and the following disclaimer.
015: *
016: * 2. Redistributions in binary form must reproduce the above copyright
017: * notice, this list of conditions and the following disclaimer in
018: * the documentation and/or other materials provided with the
019: * distribution.
020: *
021: * 3. The end-user documentation included with the redistribution, if
022: * any, must include the following acknowlegement:
023: * "This product includes software developed by Dmitry Skavish
024: * (skavish@usa.net, http://www.flashgap.com/)."
025: * Alternately, this acknowlegement may appear in the software itself,
026: * if and wherever such third-party acknowlegements normally appear.
027: *
028: * 4. The name "The JGenerator" must not be used to endorse or promote
029: * products derived from this software without prior written permission.
030: * For written permission, please contact skavish@usa.net.
031: *
032: * 5. Products derived from this software may not be called "The JGenerator"
033: * nor may "The JGenerator" appear in their names without prior written
034: * permission of Dmitry Skavish.
035: *
036: * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
037: * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
038: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
039: * DISCLAIMED. IN NO EVENT SHALL DMITRY SKAVISH OR THE OTHER
040: * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
041: * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
042: * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
043: * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
044: * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
045: * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
046: * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
047: * SUCH DAMAGE.
048: *
049: */
050:
051: package org.openlaszlo.iv.flash.util;
052:
053: import org.openlaszlo.iv.flash.api.*;
054: import org.openlaszlo.iv.flash.url.*;
055: import java.io.*;
056:
057: /**
058: * Line reader which sequentially reads lines from several urls.
059: *
060: * @author Dmitry Skavish
061: */
062: public class MultipleUrlsReader implements LineReader {
063:
064: private IVVector urls;
065: private LineReader curReader;
066: private int current;
067: private FlashFile file;
068:
069: /**
070: * Creates line reader from vector of urls.
071: *
072: * @param urls vector of {@link org.openlaszlo.iv.flash.url.IVUrl} objects
073: * @exception IOException
074: */
075: public MultipleUrlsReader(IVVector urls, FlashFile file)
076: throws IOException {
077: this .urls = urls;
078: this .current = 0;
079: this .file = file;
080: changeCurrent();
081: }
082:
083: private void changeCurrent() throws IOException {
084: IVUrl url = (IVUrl) urls.elementAt(current);
085: curReader = Util.getUrlReader(file, url);
086: }
087:
088: public String readLine() throws IOException {
089: if (current >= urls.size())
090: return null;
091: String line = curReader.readLine();
092: if (line != null)
093: return line;
094: curReader.close();
095: current++;
096: if (current >= urls.size())
097: return null;
098: changeCurrent();
099: // skip first line which is a title !!!
100: readLine();
101: return readLine();
102: }
103:
104: public void close() throws IOException {
105: if (current < urls.size()) {
106: current = urls.size();
107: curReader.close();
108: }
109: }
110:
111: }
|