- /*
- * 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: StringType.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.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.IFEQ;
- import com.sun.org.apache.bcel.internal.generic.IFNONNULL;
- import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
- 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;
- import com.sun.org.apache.xalan.internal.xsltc.compiler.FlowList;
-
- /**
- * @author Jacek Ambroziak
- * @author Santiago Pericas-Geertsen
- */
- public class StringType extends Type {
- protected StringType() {}
-
- public String toString() {
- return "string";
- }
-
- public boolean identicalTo(Type other) {
- return this == other;
- }
-
- public String toSignature() {
- return "Ljava/lang/String;";
- }
-
- public boolean isSimple() {
- return true;
- }
-
- public com.sun.org.apache.bcel.internal.generic.Type toJCType() {
- return com.sun.org.apache.bcel.internal.generic.Type.STRING;
- }
-
- /**
- * Translates a string into an object of internal type <code>type</code>.
- * The translation to int is undefined since strings 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.Boolean) {
- translateTo(classGen, methodGen, (BooleanType) type);
- }
- else if (type == Type.Real) {
- translateTo(classGen, methodGen, (RealType) type);
- }
- else if (type == Type.Reference) {
- translateTo(classGen, methodGen, (ReferenceType) type);
- }
- else if (type == Type.ObjectString) {
- // NOP -> same representation
- }
- else {
- ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
- toString(), type.toString());
- classGen.getParser().reportError(Constants.FATAL, err);
- }
- }
-
- /**
- * Translates a string into a synthesized boolean.
- *
- * @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));
- }
-
- /**
- * Translates a string into a real by calling stringToReal() from the
- * basis library.
- *
- * @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(new INVOKESTATIC(cpg.addMethodref(BASIS_LIBRARY_CLASS,
- STRING_TO_REAL,
- STRING_TO_REAL_SIG)));
- }
-
- /**
- * Translates a string 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 ConstantPoolGen cpg = classGen.getConstantPool();
- final InstructionList il = methodGen.getInstructionList();
-
- il.append(new INVOKEVIRTUAL(cpg.addMethodref(STRING_CLASS,
- "length", "()I")));
- return new FlowList(il.append(new IFEQ(null)));
- }
-
- /**
- * Expects a string on the stack and pushes a boxed string.
- * Strings are already boxed so the translation is just a NOP.
- *
- * @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateTo
- */
- public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
- ReferenceType type) {
- methodGen.getInstructionList().append(NOP);
- }
-
- /**
- * Translates a internal string into an external (Java) string.
- *
- * @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateFrom
- */
- public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
- Class clazz)
- {
- // Is String <: clazz? I.e. clazz in { String, Object }
- if (clazz.isAssignableFrom(java.lang.String.class)) {
- methodGen.getInstructionList().append(NOP);
- }
- else {
- ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
- toString(), clazz.getName());
- classGen.getParser().reportError(Constants.FATAL, err);
- }
- }
-
- /**
- * Translates an external (primitive) Java type into a string.
- *
- * @see com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type#translateFrom
- */
- public void translateFrom(ClassGenerator classGen,
- MethodGenerator methodGen, Class clazz)
- {
- final ConstantPoolGen cpg = classGen.getConstantPool();
- final InstructionList il = methodGen.getInstructionList();
-
- if (clazz.getName().equals("java.lang.String")) {
- // same internal representation, convert null to ""
- il.append(DUP);
- final BranchHandle ifNonNull = il.append(new IFNONNULL(null));
- il.append(POP);
- il.append(new PUSH(cpg, ""));
- ifNonNull.setTarget(il.append(NOP));
- }
- else {
- ErrorMsg err = new ErrorMsg(ErrorMsg.DATA_CONVERSION_ERR,
- toString(), clazz.getName());
- 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) {
- methodGen.getInstructionList().append(NOP);
- }
-
- /**
- * Returns the class name of an internal type's external representation.
- */
- public String getClassName() {
- return(STRING_CLASS);
- }
-
-
- public Instruction LOAD(int slot) {
- return new ALOAD(slot);
- }
-
- public Instruction STORE(int slot) {
- return new ASTORE(slot);
- }
- }