Package org.apache.xalan.xsltc.compiler.util

Source Code of org.apache.xalan.xsltc.compiler.util.ObjectType

/*
* @(#)$Id: ObjectType.java,v 1.4 2003/01/30 18:46:09 mkwan Exp $
*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2001-2003 The Apache Software Foundation.  All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions 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.
*
* 3. The end-user documentation included with the redistribution,
*    if any, must include the following acknowledgment:
*       "This product includes software developed by the
*        Apache Software Foundation (http://www.apache.org/)."
*    Alternately, this acknowledgment may appear in the software itself,
*    if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
*    not be used to endorse or promote products derived from this
*    software without prior written permission. For written
*    permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
*    nor may "Apache" appear in their name, without prior written
*    permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2001, Sun
* Microsystems., http://www.sun.com.  For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* @author Todd Miller
* @author Santiago Pericas-Geertsen
*
*/

package org.apache.xalan.xsltc.compiler.util;

import org.apache.bcel.generic.ALOAD;
import org.apache.bcel.generic.ASTORE;
import org.apache.bcel.generic.BranchHandle;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.GOTO;
import org.apache.bcel.generic.IFNULL;
import org.apache.bcel.generic.INVOKEVIRTUAL;
import org.apache.bcel.generic.Instruction;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.PUSH;
import org.apache.xalan.xsltc.compiler.Constants;
import org.apache.xalan.xsltc.runtime.TransletLoader;

public final class ObjectType extends Type {

    private String _javaClassName = "java.lang.Object";
    private Class  _clazz = java.lang.Object.class;

    /**
     * Used to represent an 'any' type.
     */
    protected ObjectType() {}

    /**
     * Used to represent a Java Class type such is required to support
     * non-static java functions.
     * @param javaClassName name of the class such as 'com.foo.Processor'
     */
    public ObjectType(String javaClassName) {
  _javaClassName = javaClassName;
   
  try {
    TransletLoader loader = new TransletLoader();
    _clazz = loader.loadClass(javaClassName);
  }
  catch (ClassNotFoundException e) {
    _clazz = null;
  }
    }
   
    public ObjectType(Class clazz) {
        _clazz = clazz;
        _javaClassName = clazz.getName()
    }

    public int hashCode() {
        return toString().hashCode();
    }

    public boolean equals(Object obj) {
        return (obj instanceof ObjectType);
    }

    public String getJavaClassName() {
  return _javaClassName;
    }
   
    public Class getJavaClass() {
        return _clazz; 
    }

    public String toString() {
  return "object";
    }

    public boolean identicalTo(Type other) {
  return this == other;
    }

    public String toSignature() {
  final StringBuffer result = new StringBuffer("L");
  result.append(_javaClassName.replace('.', '/')).append(';');
  return result.toString();
    }

    public org.apache.bcel.generic.Type toJCType() {
  return Util.getJCRefType(toSignature());
    }

    /**
     * Translates a void into an object of internal type <code>type</code>.
     * This translation is needed when calling external functions
     * that return void.
     *
     * @see  org.apache.xalan.xsltc.compiler.util.Type#translateTo
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
          Type type) {
  if (type == Type.String) {
      translateTo(classGen, methodGen, (StringType) type);
  }
  else {
      ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
          toString(), type.toString());
      classGen.getParser().reportError(Constants.FATAL, err);
  }
    }

    /**
     * Expects an integer on the stack and pushes its string value by calling
     * <code>Integer.toString(int i)</code>.
     *
     * @see  org.apache.xalan.xsltc.compiler.util.Type#translateTo
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
          StringType type) {
  final ConstantPoolGen cpg = classGen.getConstantPool();
  final InstructionList il = methodGen.getInstructionList();

  il.append(DUP);
  final BranchHandle ifNull = il.append(new IFNULL(null));
  il.append(new INVOKEVIRTUAL(cpg.addMethodref(_javaClassName,
                "toString",
                "()" + STRING_SIG)));
  final BranchHandle gotobh = il.append(new GOTO(null));
  ifNull.setTarget(il.append(POP));
  il.append(new PUSH(cpg, ""));
  gotobh.setTarget(il.append(NOP));
    }

    /**
     * Translates an object of this type to the external (Java) type denoted
     * by <code>clazz</code>. This method is used to translate parameters
     * when external functions are called.
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
          Class clazz) {
        if (clazz.isAssignableFrom(_clazz))
      methodGen.getInstructionList().append(NOP);
  else {
      ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
             toString(), clazz.getClass().toString());
      classGen.getParser().reportError(Constants.FATAL, err);     
  }
    }
 
    /**
     * Translates an external Java type into an Object type
     */
    public void translateFrom(ClassGenerator classGen,
            MethodGenerator methodGen, Class clazz) {
  methodGen.getInstructionList().append(NOP);
    }

    public Instruction LOAD(int slot) {
  return new ALOAD(slot);
    }
 
    public Instruction STORE(int slot) {
  return new ASTORE(slot);
    }
}
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