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Java/storage/SimpleDimFile.java

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+/*   
+SimpleDimFile.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
+ */
+package org.gzigzag;
+import java.util.*;
+import java.io.*;
+
+/** A simple dimension file format.
+ * The format consists of records: c(cell)(cell), d+(cell), d-(cell),
+ * Later to be extended with h(cell) which defines the
+ * given cell to be the headcell of its rank.
+ * <p>
+ * The record types are defined by the ASCII values of the above characters.
+ * <p>
+ */
+
+public class SimpleDimFile implements ZZDimStorer, GZZ0.Runner{
+public static final String rcsid = "$Id: SimpleDimFile.java,v 1.6 2000/09/19 10:32:00 ajk Exp $";
+
+    final byte rConn = 99;
+    final byte rDisc = 100;
+    final byte rPlus = 43;
+    final byte rMinus = 45;
+
+    
+
+    ZZDimStorer sto;
+    public void startRead(ZZDimStorer sto) {
+	this.sto = sto;
+    }
+    public void endRead() {
+	sto = null;
+    }
+
+    public int getContentType() {
+	return 42;
+    }
+    public int getContentVersion() {
+	return 0;
+    }
+
+    public void readRun(InputStream is) {
+	DataInputStream dis = new DataInputStream(is);
+	boolean eofOk = true;
+	try {
+	    while(true) {
+		eofOk = true;
+		byte rectype = dis.readByte();
+		eofOk = false;
+		switch(rectype) {
+		case rConn: 
+		    String id1 = dis.readUTF();
+		    String id2 = dis.readUTF();
+		    sto.storeConnect(id1, id2);
+		    break;
+		case rDisc:
+		    byte bdir = dis.readByte();
+		    int dir;
+		    if(bdir == rPlus)
+			dir = 1;
+		    else if(bdir == rMinus)
+			dir = -1;
+		    else
+			throw new ZZFatalError("Invalid directon");
+		    String id = dis.readUTF();
+		    sto.storeDisconnect(id, dir);
+		    break;
+		default:
+		    throw new ZZFatalError("Invalid record");
+		}
+	    }
+	} catch(EOFException e) {
+	    if(!eofOk)
+		throw new ZZFatalError("Unexpected eof in simpledimfile");
+	} catch(IOException e) {
+	    ZZLogger.exc(e);
+	    throw new ZZFatalError("Reading file");
+	}
+    }
+
+    DataOutputStream dos;
+
+    public void storeConnect(String a, String b) {
+	try {
+	    dos.writeByte(rConn);
+	    dos.writeUTF(a);
+	    dos.writeUTF(b);
+	} catch(IOException e) {
+	    ZZLogger.exc(e);
+	    throw new ZZFatalError("Writing file");
+	}
+    }
+    public void storeDisconnect(String a, int dir) {
+	try {
+	    dos.writeByte(rDisc);
+	    dos.writeByte(dir > 0 ? rPlus : rMinus);
+	    dos.writeUTF(a);
+	} catch(IOException e) {
+	    ZZLogger.exc(e);
+	    throw new ZZFatalError("Writing file");
+	}
+    }
+
+    public void startWrite(OutputStream dos) {
+	this.dos = new DataOutputStream(dos);
+    }
+
+    public void endWrite() {
+	try {
+	    dos.flush();
+	    dos = null;
+	} catch(IOException e) {
+	    ZZLogger.exc(e);
+	    throw new ZZFatalError("Reading file");
+	}
+    }
+    
+}