Source Code Cross Referenced for ObjectPlusFilesInputStream.java in  » Web-Crawler » heritrix » org » archive » io » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Web Crawler » heritrix » org.archive.io 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /* ObjectPlusFilesInputStream
002:         *
003:         * $Id: ObjectPlusFilesInputStream.java 4646 2006-09-22 17:23:04Z paul_jack $
004:         *
005:         * Created on Apr 28, 2004
006:         *
007:         * Copyright (C) 2004 Internet Archive.
008:         *
009:         * This file is part of the Heritrix web crawler (crawler.archive.org).
010:         *
011:         * Heritrix is free software; you can redistribute it and/or modify
012:         * it under the terms of the GNU Lesser Public License as published by
013:         * the Free Software Foundation; either version 2.1 of the License, or
014:         * any later version.
015:         *
016:         * Heritrix is distributed in the hope that it will be useful,
017:         * but WITHOUT ANY WARRANTY; without even the implied warranty of
018:         * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
019:         * GNU Lesser Public License for more details.
020:         *
021:         * You should have received a copy of the GNU Lesser Public License
022:         * along with Heritrix; if not, write to the Free Software
023:         * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
024:         */
025:        package org.archive.io;
026:
027:        import java.io.File;
028:        import java.io.IOException;
029:        import java.io.InputStream;
030:        import java.io.ObjectInputStream;
031:        import java.util.Iterator;
032:        import java.util.LinkedList;
033:
034:        import org.archive.util.FileUtils;
035:
036:        /**
037:         * Enhanced ObjectOutputStream with support for restoring
038:         * files that had been saved, in parallel with object
039:         * serialization.
040:         *
041:         * @author gojomo
042:         *
043:         */
044:        public class ObjectPlusFilesInputStream extends ObjectInputStream {
045:            LinkedList<File> auxiliaryDirectoryStack = new LinkedList<File>();
046:            LinkedList<Runnable> postRestoreTasks = new LinkedList<Runnable>();
047:
048:            /**
049:             * Instantiate over the given stream and using the supplied
050:             * auxiliary storage directory.
051:             *
052:             * @param in
053:             * @param storeDir
054:             * @throws IOException
055:             */
056:            public ObjectPlusFilesInputStream(InputStream in, File storeDir)
057:                    throws IOException {
058:                super (in);
059:                auxiliaryDirectoryStack.addFirst(storeDir);
060:            }
061:
062:            /**
063:             * Push another default storage directory for use
064:             * until popped.
065:             *
066:             * @param dir
067:             */
068:            public void pushAuxiliaryDirectory(String dir) {
069:                auxiliaryDirectoryStack.addFirst(new File(
070:                        getAuxiliaryDirectory(), dir));
071:            }
072:
073:            /**
074:             * Discard the top auxiliary directory.
075:             */
076:            public void popAuxiliaryDirectory() {
077:                auxiliaryDirectoryStack.removeFirst();
078:            }
079:
080:            /**
081:             * Return the top auxiliary directory, from
082:             * which saved files are restored.
083:             *
084:             * @return Auxillary directory.
085:             */
086:            public File getAuxiliaryDirectory() {
087:                return (File) auxiliaryDirectoryStack.getFirst();
088:            }
089:
090:            /**
091:             * Restore a file from storage, using the name and length
092:             * info on the serialization stream and the file from the
093:             * current auxiliary directory, to the given File.
094:             *
095:             * @param destination
096:             * @throws IOException
097:             */
098:            public void restoreFile(File destination) throws IOException {
099:                String nameAsStored = readUTF();
100:                long lengthAtStoreTime = readLong();
101:                File storedFile = new File(getAuxiliaryDirectory(),
102:                        nameAsStored);
103:                FileUtils.copyFile(storedFile, destination, lengthAtStoreTime);
104:            }
105:
106:            /**
107:             * Restore a file from storage, using the name and length
108:             * info on the serialization stream and the file from the
109:             * current auxiliary directory, to the given File.
110:             *
111:             * @param directory
112:             * @throws IOException
113:             */
114:            public void restoreFileTo(File directory) throws IOException {
115:                String nameAsStored = readUTF();
116:                long lengthAtStoreTime = readLong();
117:                File storedFile = new File(getAuxiliaryDirectory(),
118:                        nameAsStored);
119:                File destination = new File(directory, nameAsStored);
120:                FileUtils.copyFile(storedFile, destination, lengthAtStoreTime);
121:            }
122:
123:            /**
124:             * Register a task to be done when the ObjectPlusFilesInputStream
125:             * is closed.
126:             *
127:             * @param task
128:             */
129:            public void registerFinishTask(Runnable task) {
130:                postRestoreTasks.addFirst(task);
131:            }
132:
133:            private void doFinishTasks() {
134:                Iterator iter = postRestoreTasks.iterator();
135:                while (iter.hasNext()) {
136:                    ((Runnable) iter.next()).run();
137:                }
138:            }
139:
140:            /**
141:             * In addition to default, do any registered cleanup tasks.
142:             *
143:             * @see java.io.InputStream#close()
144:             */
145:            public void close() throws IOException {
146:                super.close();
147:                doFinishTasks();
148:            }
149:        }
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