EnvelopeHandler.java :  » 6.0-JDK-Modules » java-3d » com » sun » j3d » loaders » lw3d » Java Open Source

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java 3d » com » sun » j3d » loaders » lw3d » EnvelopeHandler.java
/*
 * $RCSfile: EnvelopeHandler.java,v $
 *
 * 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.
 *
 * $Revision: 1.4 $
 * $Date: 2007/02/09 17:20:06 $
 * $State: Exp $
 */

package com.sun.j3d.loaders.lw3d;

import java.io.StreamTokenizer;
import java.io.IOException;
import java.lang.reflect.Constructor;
import com.sun.j3d.loaders.ParsingErrorException;
import java.lang.ClassNotFoundException;
import java.lang.InstantiationException;
import java.lang.IllegalAccessException;
import java.lang.reflect.InvocationTargetException;


/**
 * This class is used in implementing Envelope objects (of which there
 * is currently only one - LightIntensity).
 * The class is called whenever the parser has encountered
 * a token which could have an envelope description.  If the
 * token simply has a numeric value, this value is stored.
 * If, instead, there is an envelope, then the class creates
 * the envelope class and parses that information.
 */

class EnvelopeHandler extends TextfileParser {

    float theValue = 0;
    boolean hasValue = false;
    boolean hasEnvelope = true;
    LwsEnvelope theEnvelope = null;

  /**
  * Constructor: This constructor is used if there is no existing
  * implementation for this type of envelope.  The real constructor
  * is called with the generic LwsEnvelope class name, which will
  * allow s to parse and ignore the envelope data
  */
    EnvelopeHandler(StreamTokenizer st,
        int totalFrames, float totalTime) {
        this(st, totalFrames, totalTime,
       "com.sun.j3d.utils.loaders.lw3d.LwsEnvelope");
    }

  /**
  * Constructor: This constructor is called with the name of a class
  * that can handle the encountered envelope.  This is done so that this
  * EnvelopeHandler class can generically call the given class to handle
  * the envelope, whether it results in parsing/ignoring the data or 
  * in actually using the data
  */
    EnvelopeHandler(StreamTokenizer st,
         int totalFrames,
         float totalTime,
         String envClassName) throws ParsingErrorException {
  try {
      theValue = (float)getNumber(st);
            hasValue = true;
  }
  catch (NumberFormatException e) {
      if (st.ttype == '(') {
    st.pushBack();
    // This code creates a new instance for the given class name
    try {
        Class envClass = Class.forName(envClassName);
        Constructor constructors[] = envClass.getConstructors();
        Constructor con = constructors[0];
        Object args[] = new Object[3];
        args[0] = (Object)st;
        args[1] = (Object)(new Integer(totalFrames));
        args[2] = (Object)(new Float(totalTime));
        try {
      theEnvelope = (LwsEnvelope)con.newInstance(args);
      hasEnvelope = true;
        }
        catch (InstantiationException e3) {
      // Ignore
        }
        catch (IllegalAccessException e3) {
      // Ignore
        }
        catch (InvocationTargetException e3) {
      // Ignore
        }
    }
    catch (ClassNotFoundException e2) {
        // Ignore
    }
      }
  }
    }
}
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