/*
* 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: NodeType.java,v 1.12 2004/02/16 22:26:45 minchau Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler.util;
import com.sun.org.apache.bcel.internal.generic.BranchHandle;
import com.sun.org.apache.bcel.internal.generic.CHECKCAST;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.GETFIELD;
import com.sun.org.apache.bcel.internal.generic.GOTO;
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.INVOKESPECIAL;
import com.sun.org.apache.bcel.internal.generic.ISTORE;
import com.sun.org.apache.bcel.internal.generic.Instruction;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.bcel.internal.generic.NEW;
import com.sun.org.apache.bcel.internal.generic.PUSH;
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.xalan.internal.xsltc.compiler.NodeTest;
/**
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*/
public final class NodeType extends Type {
private final int _type;
protected NodeType() {
this(NodeTest.ANODE);
}
protected NodeType(int type) {
_type = type;
}
public int getType() {
return _type;
}
public String toString() {
return "node-type";
}
public boolean identicalTo(Type other) {
return other instanceof NodeType;
}
public int hashCode() {
return _type;
}
public String toSignature() {
return "I";
}
public com.sun.org.apache.bcel.internal.generic.Type toJCType() {
return com.sun.org.apache.bcel.internal.generic.Type.INT;
}
/**
* Translates a node into an object of internal type <code>type</code>.
* The translation to int is undefined since nodes 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.Boolean) {
translateTo(classGen, methodGen, (BooleanType) type);
}
else if (type == Type.Real) {
translateTo(classGen, methodGen, (RealType) type);
}
else if (type == Type.NodeSet) {
translateTo(classGen, methodGen, (NodeSetType) type);
}
else if (type == Type.Reference) {
translateTo(classGen, methodGen, (ReferenceType) type);
}
else if (type == Type.Object) {
translateTo(classGen, methodGen, (ObjectType) type);
}
else {
ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
toString(), type.toString());
classGen.getParser().reportError(Constants.FATAL, err);
}
}
/**
* Expects a node on the stack and pushes its string value.
*
* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
StringType type) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
switch (_type) {
case NodeTest.ROOT:
case NodeTest.ELEMENT:
il.append(methodGen.loadDOM());
il.append(SWAP); // dom ref must be below node index
int index = cpg.addInterfaceMethodref(DOM_INTF,
GET_ELEMENT_VALUE,
GET_ELEMENT_VALUE_SIG);
il.append(new INVOKEINTERFACE(index, 2));
break;
case NodeTest.ANODE:
case NodeTest.COMMENT:
case NodeTest.ATTRIBUTE:
case NodeTest.PI:
il.append(methodGen.loadDOM());
il.append(SWAP); // dom ref must be below node index
index = cpg.addInterfaceMethodref(DOM_INTF,
GET_NODE_VALUE,
GET_NODE_VALUE_SIG);
il.append(new INVOKEINTERFACE(index, 2));
break;
default:
ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
toString(), type.toString());
classGen.getParser().reportError(Constants.FATAL, err);
break;
}
}
/**
* Translates a node into a synthesized boolean.
* If the expression is "@attr",
* then "true" is pushed iff "attr" is an attribute of the current node.
* If the expression is ".", the result is always "true".
*
* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
BooleanType type) {
final InstructionList il = methodGen.getInstructionList();
FlowList falsel = translateToDesynthesized(classGen, methodGen, type);
il.append(ICONST_1);
final BranchHandle truec = il.append(new GOTO(null));
falsel.backPatch(il.append(ICONST_0));
truec.setTarget(il.append(NOP));
}
/**
* Expects a node on the stack and pushes a real.
* First the node is converted to string, and from string to real.
*
* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
RealType type) {
translateTo(classGen, methodGen, Type.String);
Type.String.translateTo(classGen, methodGen, Type.Real);
}
/**
* Expects a node on the stack and pushes a singleton node-set. Singleton
* iterators are already started after construction.
*
* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
NodeSetType type) {
ConstantPoolGen cpg = classGen.getConstantPool();
InstructionList il = methodGen.getInstructionList();
// Create a new instance of SingletonIterator
il.append(new NEW(cpg.addClass(SINGLETON_ITERATOR)));
il.append(DUP_X1);
il.append(SWAP);
final int init = cpg.addMethodref(SINGLETON_ITERATOR, "<init>",
"(" + NODE_SIG +")V");
il.append(new INVOKESPECIAL(init));
}
/**
* Subsume Node 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 node into 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) {
final InstructionList il = methodGen.getInstructionList();
return new FlowList(il.append(new IFEQ(null)));
}
/**
* Expects a node on the stack and pushes a boxed node. Boxed nodes
* are represented by an instance of <code>com.sun.org.apache.xalan.internal.xsltc.dom.Node</code>.
*
* @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
ReferenceType type) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
il.append(new NEW(cpg.addClass(RUNTIME_NODE_CLASS)));
il.append(DUP_X1);
il.append(SWAP);
il.append(new PUSH(cpg, _type));
il.append(new INVOKESPECIAL(cpg.addMethodref(RUNTIME_NODE_CLASS,
"<init>", "(II)V")));
}
/**
* Translates a node into the Java type denoted by <code>clazz</code>.
* Expects a node on the stack and pushes an object of the appropriate
* type after coercion.
*/
public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
Class clazz) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
String className = clazz.getName();
if (className.equals("java.lang.String")) {
translateTo(classGen, methodGen, Type.String);
return;
}
il.append(methodGen.loadDOM());
il.append(SWAP); // dom ref must be below node index
if (className.equals("org.w3c.dom.Node") ||
className.equals("java.lang.Object")) {
int index = cpg.addInterfaceMethodref(DOM_INTF,
MAKE_NODE,
MAKE_NODE_SIG);
il.append(new INVOKEINTERFACE(index, 2));
}
else if (className.equals("org.w3c.dom.NodeList")) {
int index = cpg.addInterfaceMethodref(DOM_INTF,
MAKE_NODE_LIST,
MAKE_NODE_LIST_SIG);
il.append(new INVOKEINTERFACE(index, 2));
}
else {
ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
toString(), className);
classGen.getParser().reportError(Constants.FATAL, err);
}
}
/**
* Translates an object of this type to its boxed representation.
*/
public void translateBox(ClassGenerator classGen,
MethodGenerator methodGen) {
translateTo(classGen, methodGen, Type.Reference);
}
/**
* Translates an object of this type to its unboxed representation.
*/
public void translateUnBox(ClassGenerator classGen,
MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
il.append(new CHECKCAST(cpg.addClass(RUNTIME_NODE_CLASS)));
il.append(new GETFIELD(cpg.addFieldref(RUNTIME_NODE_CLASS,
NODE_FIELD,
NODE_FIELD_SIG)));
}
/**
* Returns the class name of an internal type's external representation.
*/
public String getClassName() {
return(RUNTIME_NODE_CLASS);
}
public Instruction LOAD(int slot) {
return new ILOAD(slot);
}
public Instruction STORE(int slot) {
return new ISTORE(slot);
}
}
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