- /*
- * 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: ObjectType.java,v 1.9 2004/02/23 10:29:35 aruny Exp $
- */
-
- package com.sun.org.apache.xalan.internal.xsltc.compiler.util;
-
- 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.BranchHandle;
- import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
- import com.sun.org.apache.bcel.internal.generic.GOTO;
- import com.sun.org.apache.bcel.internal.generic.IFNULL;
- import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
- 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.PUSH;
- import com.sun.org.apache.xalan.internal.xsltc.compiler.Constants;
-
- /**
- * @author Todd Miller
- * @author Santiago Pericas-Geertsen
- */
- public final class ObjectType extends Type {
-
- private String _javaClassName = "java.lang.Object";
- private Class _clazz = java.lang.Object.class;
-
- /**
- * 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'
- */
- protected ObjectType(String javaClassName) {
- _javaClassName = javaClassName;
-
- try {
- _clazz = ObjectFactory.findProviderClass(
- javaClassName, ObjectFactory.findClassLoader(), true);
- }
- catch (ClassNotFoundException e) {
- _clazz = null;
- }
- }
-
- protected 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 _javaClassName;
- }
-
- 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 com.sun.org.apache.bcel.internal.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 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 {
- 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 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();
-
- 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);
- }
- }