/*
* Copyright 2001-2004 The Apache Software Foundation.
*
* Licensed 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,v 1.2.4.1 2005/09/05 11:29:12 pvedula Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler.util;
import com.sun.org.apache.bcel.internal.generic.PUSH;
import com.sun.org.apache.bcel.internal.generic.ALOAD;
import com.sun.org.apache.bcel.internal.generic.ASTORE;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.IFEQ;
import com.sun.org.apache.bcel.internal.generic.ILOAD;
import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
import com.sun.org.apache.bcel.internal.generic.Instruction;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.xalan.internal.xsltc.compiler.Constants;
import com.sun.org.apache.xalan.internal.xsltc.compiler.FlowList;
import com.sun.org.apache.xml.internal.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 com.sun.org.apache.bcel.internal.generic.Type toJCType() {
return com.sun.org.apache.bcel.internal.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 com.sun.org.apache.xalan.internal.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 com.sun.org.apache.xalan.internal.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 com.sun.org.apache.xalan.internal.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 com.sun.org.apache.xalan.internal.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 com.sun.org.apache.xalan.internal.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 com.sun.org.apache.xalan.internal.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 com.sun.org.apache.xalan.internal.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 com.sun.org.apache.xalan.internal.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("com.sun.org.apache.xalan.internal.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 com.sun.org.apache.xalan.internal.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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