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/*
* Copyright (c) 2007 Sun Microsystems, Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistribution of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistribution in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any
* kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
* WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
* EXCLUDED. SUN MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL
* NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF
* USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR
* ANY LOST REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL,
* CONSEQUENTIAL, INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND
* REGARDLESS OF THE THEORY OF LIABILITY, ARISING OUT OF THE USE OF OR
* INABILITY TO USE THIS SOFTWARE, EVEN IF SUN HAS BEEN ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed, licensed or
* intended for use in the design, construction, operation or
* maintenance of any nuclear facility.
*
*/
package com.sun.j3d.utils.scenegraph.io.retained;
import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.IOException;
import java.util.HashMap;
import javax.media.j3d.BranchGroup;
import com.sun.j3d.utils.scenegraph.io.state.javax.media.j3d.SceneGraphObjectState;
/**
* Provides the infrastructure for ScenGraphStream Reader and Writer
*/
public class StreamControl extends Controller {
protected String FILE_IDENT = new String( "j3dsf" );
private DataInputStream inputStream;
private DataOutputStream outputStream;
public StreamControl( DataOutputStream out ) {
super();
outputStream = out;
symbolTable = new SymbolTable( this );
}
public StreamControl( DataInputStream in ) {
super();
inputStream = in;
symbolTable = new SymbolTable( this );
}
/**
* Prepare the Stream for writing, by sending header information
*/
public void writeStreamHeader() throws IOException {
outputStream.writeUTF( FILE_IDENT );
outputStream.writeInt( outputFileVersion );
}
public void readStreamHeader() throws IOException {
String ident = inputStream.readUTF();
if ( ident.equals("demo_j3s") )
throw new IOException( "Use Java 3D Fly Through I/O instead of Java 3D Scenegraph I/O" );
if ( !ident.equals("j3dsf") )
throw new IOException(
"This is a File - use SceneGraphFileReader instead");
currentFileVersion = inputStream.readInt();
if (currentFileVersion > outputFileVersion ) {
throw new IOException("Unsupported file version. This file was written using a new version of the SceneGraph IO API, please update your installtion to the latest version");
}
}
/**
* Add the named objects to the symbol table
*/
public void addNamedObjects( HashMap namedObjects ) {
symbolTable.addNamedObjects( namedObjects );
}
/**
* The BranchGraph userData is not supported in a stream and will be
* ignored.
*
* However the data in the userData field of the BranchGroup will be
* stored in the stream
*/
@Override
public void writeBranchGraph( BranchGroup bg, java.io.Serializable userData ) throws IOException {
try {
SymbolTableData symbol = symbolTable.getSymbol( bg );
if (symbol==null) {
symbol = symbolTable.createSymbol( bg );
symbol.branchGraphID = -1; // This is a new BranchGraph so set the ID to -1
} // which will cause setBranchGraphRoot to assign a new ID.
symbolTable.setBranchGraphRoot( symbol, 0 );
symbolTable.startUnsavedNodeComponentFrame();
SceneGraphObjectState state = createState( bg, symbol );
writeObject( outputStream, state );
writeNodeComponents( outputStream );
symbolTable.endUnsavedNodeComponentFrame();
if (symbolTable.branchGraphHasDependencies( symbol.branchGraphID ))
throw new javax.media.j3d.DanglingReferenceException();
symbolTable.clearUnshared();
symbolTable.writeTable( outputStream );
} catch( SGIORuntimeException e ) {
throw new IOException( e.getMessage() );
}
}
public BranchGroup readBranchGraph( HashMap namedObjects ) throws IOException {
try {
SceneGraphObjectState state = readObject( inputStream );
readNodeComponents( inputStream );
symbolTable.readTable( inputStream, true );
symbolTable.setBranchGraphRoot( state.getSymbol(), 0 );
state.buildGraph();
if (namedObjects!=null)
symbolTable.getNamedObjectMap( namedObjects );
return (BranchGroup)state.getNode();
} catch( SGIORuntimeException e ) {
throw new IOException( e.getMessage() );
}
}
/**
* Read the set of branchgraps.
*
* Used by readUniverse
*
* RandomAccessFileControl will read the graphs in the array,
* StreamControl expects the graphs to follow the universe in the
* stream so it will read graphs.length branchgraphs.
*/
@Override
protected void readBranchGraphs( int[] graphs ) throws IOException {
for(int i=0; i