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/*
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ZZCacheDimSpace.java
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*
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* Copyright (c) 2000, Ted Nelson and Tuomas Lukka
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*
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* You may use and distribute under the terms of either the GNU Lesser
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* General Public License, either version 2 of the license or,
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* at your choice, any later version. Alternatively, you may use and
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* distribute under the terms of the XPL.
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*
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* See the LICENSE.lgpl and LICENSE.xpl files for the specific terms of
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* the licenses.
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*
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* This software is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the README
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* file for more details.
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*
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*/
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/*
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* Written by Tuomas Lukka
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*/
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package org.gzigzag;
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import java.util.*;
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import java.io.*;
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import java.lang.reflect.*;
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/** A dimspace that uses a StreamSet to be persistent.
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* XXX Triggers to undo events?!?!? Existing ZZCells deleted??
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*/
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public class ZZCacheDimSpace extends ZZDimSpace {
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public static final String rcsid = "$Id: ZZCacheDimSpace.java,v 1.28 2001/03/08 13:54:20 ajk Exp $";
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protected int maxtimestamp;
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StreamSet strs;
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// XXX Stamps!
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UndoList ul = new UndoList(2935);
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ZZCacheContentStore ct = new ZZCacheContentStore();
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Hashtable scrolls = new Hashtable();
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int timestamp = 1;
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synchronized public int stamp() { return ul.stamp(); }
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synchronized public void undo() { ul.undo(); }
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synchronized public void redo() { ul.redo(); }
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synchronized public int commit() {
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if (readonly) return timestamp;
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p("COMMIT!");
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// Put in time of last save. Not used anywhere yet.
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ct.put("savetime", ""+System.currentTimeMillis());
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for(Enumeration e = dims.keys();
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e.hasMoreElements(); ) {
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String dname = (String)e.nextElement();
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ZZDimension d = (ZZDimension)dims.get(dname);
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if(d instanceof ZZCacheDimension) {
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ZZCacheDimension cd = (ZZCacheDimension)d;
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cd.startCommit();
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}
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}
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ct.startCommit();
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ul.commit();
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int stmp = ++timestamp;
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SimpleDimFile outf = new SimpleDimFile();
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for(Enumeration e = dims.keys();
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e.hasMoreElements(); ) {
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String dname = (String)e.nextElement();
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ZZDimension d = (ZZDimension)dims.get(dname);
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if(d instanceof ZZCacheDimension) {
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ZZCacheDimension cd = (ZZCacheDimension)d;
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GZZ0 writ = new GZZ0(strs, dname);
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writ.startWrite(stmp, outf);
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cd.endCommit(outf);
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writ.endWrite(false);
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}
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}
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SimpleContentFile coutf = new SimpleContentFile();
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GZZ0 cwrit = new GZZ0(strs, "CONTENT");
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cwrit.startWrite(stmp, coutf);
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ct.endCommit(coutf);
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cwrit.endWrite(true);
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for (Enumeration e = spaceParts.keys(); e.hasMoreElements();) {
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String s = (String)e.nextElement();
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ZZSpacePart sp = (ZZSpacePart)spaceParts.get(s);
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sp.postCommitHook();
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}
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return stmp;
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}
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public ZZCacheDimSpace(StreamSet w) {
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this(w, -1);
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}
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public ZZCacheDimSpace(ZZCacheDimSpace cds, int tstamp) {
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this(cds.strs, tstamp);
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}
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public ZZCacheDimSpace(StreamSet w, int tstamp) {
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this(w, tstamp, (tstamp != -1));
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}
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public ZZCacheDimSpace(StreamSet w, int tstamp, boolean readonly) {
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super(readonly);
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strs = w;
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ct.setUndoList(ul);
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ct.setSpace(this);
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maxtimestamp = tstamp;
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if(strs.exists("CONTENT")) {
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SimpleContentFile cinf = new SimpleContentFile();
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GZZ0 crea = new GZZ0(strs, "CONTENT");
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cinf.startRead(ct);
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timestamp = crea.read(cinf, tstamp);
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cinf.endRead();
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} else {
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// The id of the next free cell must be stored in the space,
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// this is a kludge.
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ct.put("nextfreeid", nextID);
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// The home cell is called HOME
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ct.put("1", "HOME");
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}
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nextID = (String)ct.get("nextfreeid");
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spaceParts.put("bintree", new BinaryTreePart(this, "bintree"));
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spaceParts.put("imptree", new ImpliedTreePart(this, "imptree"));
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spaceParts.put("imptree2", new ImpliedTreePart2(this, "imptree2"));
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spaceParts.put("doubler", new DoubleStepPart(this, "doubler"));
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spaceParts.put("version", new VersionPart(this, "version"));
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spaceParts.put("gentreetest", new GenTreePart(this, "gentreetest",
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new GenTreeTestModel()));
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try {
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spaceParts.put("nile1str", new GenTreePart(this, "nile1str",
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(GenTreePartModel)
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Class.forName("org.gzigzag.module.Nile1GenTreeModel").
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newInstance()));
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} catch(Exception e) {
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p("Nile module not found - this is not fatal unless you know what nile is. Don't worry.");
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}
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try {
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Class ztp = Class.forName("org.zaubertrank.ZaubertrankPart");
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Class zzsp = Class.forName("org.gzigzag.ZZSpace");
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Constructor ztpc = ztp.getConstructor(new Class[] {
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zzsp, "".getClass() });
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ZZSpacePart sp = (ZZSpacePart)
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ztpc.newInstance(new Object[] { this, "zaubertrank" });
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spaceParts.put("zaubertrank", sp);
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} catch (ClassNotFoundException e) {
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// ignore: that Zaubertrank stack trace is annoying
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} catch(Throwable t) {
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ZZLogger.exc(t);
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// the zaubertrank isn't compiled by standard, so don't tell
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}
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}
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protected void setNextID(String s) {
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super.setNextID(s);
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ct.put("nextfreeid", nextID);
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}
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protected Span getSpan(String id) {
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Object o = ct.get(id);
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if(!(o instanceof Span))
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return null;
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return (Span)o;
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}
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protected String getText(String id) {
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Object o = ct.get(id);
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if(o==null) return "";
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if(o instanceof Span)
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o = ((Span)o).getString(getHomeCell());
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return (String)o;
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}
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protected void setText(String id, Object cont) {
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if (readonly) throw new ZZError("readonly space");
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ct.put(id, cont);
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}
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protected ZZDimension createDimension(String s) {
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if(!validDim(s)) return null;
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if(s.indexOf(':') != -1) return createPartDimension(s);
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ZZDimension d;
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if(s.equals("d.cellcreation")) {
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d = new IDDimension();
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} else {
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ZZCacheDimension dim = new ZZCacheDimension(readonly);
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dim.setUndoList(ul);
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InputStream is = strs.getInputStream(s);
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if(strs.exists(s)) {
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SimpleDimFile inf = new SimpleDimFile();
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inf.startRead(dim);
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GZZ0 rea = new GZZ0(strs, s);
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rea.read(inf, maxtimestamp);
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inf.endRead();
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}
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d = dim;
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}
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d.setSpace(this);
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return d;
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}
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public String getIDOrNull() {
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Object o = ct.get("spaceid");
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if (!(o instanceof String)) {
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return null;
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}
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return (String)o;
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}
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public void setID(String id) {
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if (readonly) throw new ZZError("readonly space");
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ct.put("spaceid", id);
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}
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public StringScroll getStringScroll() {
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return getStringScroll("text");
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}
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public StringScroll getStringScroll(String name) {
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StringScroll scr;
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if((scr = (StringScroll)scrolls.get(name)) == null) {
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Writable wr = strs.getWritable("STRSCR_"+name);
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scr = new StringScroll(name, wr, readonly);
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// XXX ???
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Scroll.register(name, scr);
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scrolls.put(name, scr);
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}
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return scr;
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}
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}
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