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Java/storage/DirStreamSet.java

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+/*   
+DirStreamSet.java
+ *    
+ *    Copyright (c) 2000, Ted Nelson and Tuomas Lukka
+ *
+ *    You may use and distribute under the terms of either the GNU Lesser
+ *    General Public License, either version 2 of the license or,
+ *    at your choice, any later version. Alternatively, you may use and
+ *    distribute under the terms of the XPL.
+ *
+ *    See the LICENSE.lgpl and LICENSE.xpl files for the specific terms of 
+ *    the licenses.
+ *
+ *    This software 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 README
+ *    file for more details.
+ *
+ */
+/*
+ * Written by Tuomas Lukka, locking by Antti-Juhani Kaijanaho
+ */
+package org.gzigzag;
+import java.util.*;
+import java.io.*;
+
+/** A directory implementation of StreamSet
+ */
+
+public class DirStreamSet extends StreamSet {
+public static final String rcsid = "$Id: DirStreamSet.java,v 1.5 2000/09/18 14:28:22 tjl Exp $";
+    File dir;
+
+    public InputStream getInputStream(String id) {
+	try {
+	    File f = new File(dir, id);
+	    if(!f.exists()) return null;
+	    if(!f.canRead()) throw new ZZFatalError("Can't read file");
+	    return new BufferedInputStream(
+		new FileInputStream(f), 4096);
+	} catch(Exception e) {
+	    ZZLogger.exc(e);
+	    throw new ZZFatalError("File problem");
+	}
+    }
+
+    public OutputStream getAppendStream(String id) {
+	try {
+	    File f = new File(dir, id);
+	    return new BufferedOutputStream(
+		new FileOutputStream(f.getPath(), true));
+	} catch(Exception e) {
+	    ZZLogger.exc(e);
+	    throw new ZZFatalError("File problem");
+	}
+    }
+    public boolean exists(String id) {
+	File fn = new File(dir, id);
+	return fn.exists();
+    }
+
+    public Writable getWritable(String id) {
+	if(id == null || id.equals(""))
+	    throw new ZZError("Can't use writables with null or empty name");
+	try {
+	    File fn = new File(dir, id);
+	    final RandomAccessFile f = new RandomAccessFile(fn, "rw");
+	    return new FileWritable(f) ;
+	} catch(Exception e) {
+	    ZZLogger.exc(e);
+	    throw new ZZError(" "+e);
+	}
+    }
+
+    public DirStreamSet(File dir0) {
+	try {
+	    dir = dir0;
+	    if(dir.exists() && !dir.isDirectory()) {
+		throw new ZZError("MUST BE DIRECTORY!!!! "+dir);
+	    }
+	    if(!dir.exists()) {
+		dir.mkdirs();
+	    }
+	} catch(Exception e) {
+	    ZZLogger.exc(e);
+	    throw new ZZError(" "+e);
+	}
+    }
+}
+
+