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

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

/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the  "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
*     http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: ReferenceType.java 468649 2006-10-28 07:00:55Z minchau $
*/

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

import org.apache.bcel.generic.PUSH;
import org.apache.bcel.generic.ALOAD;
import org.apache.bcel.generic.ASTORE;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.IFEQ;
import org.apache.bcel.generic.ILOAD;
import org.apache.bcel.generic.INVOKEINTERFACE;
import org.apache.bcel.generic.INVOKESTATIC;
import org.apache.bcel.generic.Instruction;
import org.apache.bcel.generic.InstructionList;

import org.apache.xalan.xsltc.compiler.Constants;
import org.apache.xalan.xsltc.compiler.FlowList;

import org.apache.xml.dtm.DTM;

/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
* @author Erwin Bolwidt <ejb@klomp.org>
*/
public final class ReferenceType extends Type {
    protected ReferenceType() {}

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

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

    public String toSignature() {
  return "Ljava/lang/Object;";
    }

    public org.apache.bcel.generic.Type toJCType() {
  return org.apache.bcel.generic.Type.OBJECT;
    }

    /**
     * Translates a reference to an object of internal type <code>type</code>.
     * The translation to int is undefined since references
     * are always converted to reals in arithmetic expressions.
     *
     * @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 if (type == Type.Real) {
      translateTo(classGen, methodGen, (RealType) type);
  }
  else if (type == Type.Boolean) {
      translateTo(classGen, methodGen, (BooleanType) type);
  }
  else if (type == Type.NodeSet) {
      translateTo(classGen, methodGen, (NodeSetType) type);
  }
  else if (type == Type.Node) {
      translateTo(classGen, methodGen, (NodeType) type);
  }
  else if (type == Type.ResultTree) {
      translateTo(classGen, methodGen, (ResultTreeType) type);
  }
  else if (type == Type.Object) {
      translateTo(classGen, methodGen, (ObjectType) type);
  }
  else if (type == Type.Reference ) {
        } 
  else {
      ErrorMsg err = new ErrorMsg(ErrorMsg.INTERNAL_ERR, type.toString());
      classGen.getParser().reportError(Constants.FATAL, err);
  }
    }

    /**
     * Translates reference into object of internal type <code>type</code>.
     *
     * @see  org.apache.xalan.xsltc.compiler.util.Type#translateTo
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
          StringType type) {
  final int current = methodGen.getLocalIndex("current");
  ConstantPoolGen cpg = classGen.getConstantPool();
  InstructionList il = methodGen.getInstructionList();

  // If no current, conversion is a top-level
  if (current < 0) {
      il.append(new PUSH(cpg, DTM.ROOT_NODE))// push root node
  }
  else {
      il.append(new ILOAD(current));
  }
  il.append(methodGen.loadDOM());
  final int stringF = cpg.addMethodref(BASIS_LIBRARY_CLASS,
               "stringF",
               "("
               + OBJECT_SIG
               + NODE_SIG
               + DOM_INTF_SIG
               + ")" + STRING_SIG);
  il.append(new INVOKESTATIC(stringF));
    }

    /**
     * Translates a reference into an object of internal type <code>type</code>.
     *
     * @see  org.apache.xalan.xsltc.compiler.util.Type#translateTo
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
          RealType type) {
  final ConstantPoolGen cpg = classGen.getConstantPool();
  final InstructionList il = methodGen.getInstructionList();

  il.append(methodGen.loadDOM());
  int index = cpg.addMethodref(BASIS_LIBRARY_CLASS, "numberF",
             "("
             + OBJECT_SIG
             + DOM_INTF_SIG
             + ")D");
  il.append(new INVOKESTATIC(index));
    }

    /**
     * Translates a reference to an object of internal type <code>type</code>.
     *
     * @see  org.apache.xalan.xsltc.compiler.util.Type#translateTo
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
          BooleanType type) {
  final ConstantPoolGen cpg = classGen.getConstantPool();
  final InstructionList il = methodGen.getInstructionList();

  int index = cpg.addMethodref(BASIS_LIBRARY_CLASS, "booleanF",
             "("
             + OBJECT_SIG
             + ")Z");
  il.append(new INVOKESTATIC(index));
    }

    /**
     * Casts a reference into a NodeIterator.
     *
     * @see  org.apache.xalan.xsltc.compiler.util.Type#translateTo
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
          NodeSetType type) {
  final ConstantPoolGen cpg = classGen.getConstantPool();
  final InstructionList il = methodGen.getInstructionList();
  int index = cpg.addMethodref(BASIS_LIBRARY_CLASS, "referenceToNodeSet",
             "("
             + OBJECT_SIG
             + ")"
             + NODE_ITERATOR_SIG);
  il.append(new INVOKESTATIC(index));

  // Reset this iterator
  index = cpg.addInterfaceMethodref(NODE_ITERATOR, RESET, RESET_SIG);
  il.append(new INVOKEINTERFACE(index, 1));
    }

    /**
     * Casts a reference into a Node.
     *
     * @see org.apache.xalan.xsltc.compiler.util.Type#translateTo
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
          NodeType type) {
  translateTo(classGen, methodGen, Type.NodeSet);
  Type.NodeSet.translateTo(classGen, methodGen, type);
    }

    /**
     * Casts a reference into a ResultTree.
     *
     * @see  org.apache.xalan.xsltc.compiler.util.Type#translateTo
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
          ResultTreeType type) {
  final ConstantPoolGen cpg = classGen.getConstantPool();
  final InstructionList il = methodGen.getInstructionList();
  int index = cpg.addMethodref(BASIS_LIBRARY_CLASS, "referenceToResultTree",
             "(" + OBJECT_SIG + ")" + DOM_INTF_SIG);
  il.append(new INVOKESTATIC(index));
    }

    /**
     * Subsume reference into ObjectType.
     *
     * @see  org.apache.xalan.xsltc.compiler.util.Type#translateTo
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
          ObjectType type) {
  methodGen.getInstructionList().append(NOP);
    }

    /**
     * Translates a reference into the Java type denoted by <code>clazz</code>.
     */
    public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
          Class clazz) {
  final ConstantPoolGen cpg = classGen.getConstantPool();
  final InstructionList il = methodGen.getInstructionList();

        int referenceToLong = cpg.addMethodref(BASIS_LIBRARY_CLASS,
                                               "referenceToLong",
                                               "(" + OBJECT_SIG + ")J");
        int referenceToDouble = cpg.addMethodref(BASIS_LIBRARY_CLASS,
                                                 "referenceToDouble",
                                                "(" + OBJECT_SIG + ")D");     
        int referenceToBoolean = cpg.addMethodref(BASIS_LIBRARY_CLASS,
                                                  "referenceToBoolean",
                                                 "(" + OBJECT_SIG + ")Z");
       
  if (clazz.getName().equals("java.lang.Object")) {
      il.append(NOP);
  }
  else if (clazz == Double.TYPE) {
      il.append(new INVOKESTATIC(referenceToDouble));
  }
  else if (clazz.getName().equals("java.lang.Double")) {
      il.append(new INVOKESTATIC(referenceToDouble));
            Type.Real.translateTo(classGen, methodGen, Type.Reference);
  }
  else if (clazz == Float.TYPE) {
      il.append(new INVOKESTATIC(referenceToDouble));
            il.append(D2F);
  }
  else if (clazz.getName().equals("java.lang.String")) {
      int index = cpg.addMethodref(BASIS_LIBRARY_CLASS, "referenceToString",
                 "("
                 + OBJECT_SIG
                 + DOM_INTF_SIG
                 + ")"
                 + "Ljava/lang/String;");
      il.append(methodGen.loadDOM());
      il.append(new INVOKESTATIC(index));
  }
  else if (clazz.getName().equals("org.w3c.dom.Node")) {
      int index = cpg.addMethodref(BASIS_LIBRARY_CLASS, "referenceToNode",
                 "("
                 + OBJECT_SIG
                 + DOM_INTF_SIG
                 + ")"
                 + "Lorg/w3c/dom/Node;");
      il.append(methodGen.loadDOM());
      il.append(new INVOKESTATIC(index));
  }
  else if (clazz.getName().equals("org.w3c.dom.NodeList")) {
      int index = cpg.addMethodref(BASIS_LIBRARY_CLASS, "referenceToNodeList",
                 "("
                 + OBJECT_SIG
                 + DOM_INTF_SIG
                 + ")"
                 + "Lorg/w3c/dom/NodeList;");
      il.append(methodGen.loadDOM());
      il.append(new INVOKESTATIC(index));
  }
  else if (clazz.getName().equals("org.apache.xalan.xsltc.DOM")) {
      translateTo(classGen, methodGen, Type.ResultTree);
  }
  else if (clazz == Long.TYPE) {
      il.append(new INVOKESTATIC(referenceToLong));
        }
  else if (clazz == Integer.TYPE) {
      il.append(new INVOKESTATIC(referenceToLong));
            il.append(L2I);
  }
        else if (clazz == Short.TYPE) {
      il.append(new INVOKESTATIC(referenceToLong));
            il.append(L2I);
            il.append(I2S);
        }
        else if (clazz == Byte.TYPE) {
      il.append(new INVOKESTATIC(referenceToLong));
            il.append(L2I);
            il.append(I2B);
        }
        else if (clazz == Character.TYPE) {
      il.append(new INVOKESTATIC(referenceToLong));
            il.append(L2I);
            il.append(I2C);
        }
  else if (clazz == java.lang.Boolean.TYPE) {
      il.append(new INVOKESTATIC(referenceToBoolean));
  }
  else if (clazz.getName().equals("java.lang.Boolean")) {
      il.append(new INVOKESTATIC(referenceToBoolean));
            Type.Boolean.translateTo(classGen, methodGen, Type.Reference);
  }
  else {
      ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
          toString(), clazz.getName());
      classGen.getParser().reportError(Constants.FATAL, err);
  }
    }

    /**
     * Translates an external Java type into a reference. Only conversion
     * allowed is from java.lang.Object.
     */
    public void translateFrom(ClassGenerator classGen, MethodGenerator methodGen,
            Class clazz) {
  if (clazz.getName().equals("java.lang.Object")) {
      methodGen.getInstructionList().append(NOP);
  }
  else {
      ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
        toString(), clazz.getName());
      classGen.getParser().reportError(Constants.FATAL, err);
        }
    }

    /**
     * Expects a reference on the stack and translates it to a non-synthesized
     * boolean. It does not push a 0 or a 1 but instead returns branchhandle
     * list to be appended to the false list.
     *
     * @see org.apache.xalan.xsltc.compiler.util.Type#translateToDesynthesized
     */
    public FlowList translateToDesynthesized(ClassGenerator classGen,
               MethodGenerator methodGen,
               BooleanType type) {
  InstructionList il = methodGen.getInstructionList();
  translateTo(classGen, methodGen, type);
  return new FlowList(il.append(new IFEQ(null)));
    }

    /**
     * Translates an object of this type to its boxed representation.
     */
    public void translateBox(ClassGenerator classGen,
           MethodGenerator methodGen) {
    }

    /**
     * Translates an object of this type to its unboxed representation.
     */
    public void translateUnBox(ClassGenerator classGen,
             MethodGenerator methodGen) {
    }


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

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

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