content: /*
   *  This file is part of AndroidIDE.
   *
   *  AndroidIDE is free software: you can redistribute it and/or modify
   *  it under the terms of the GNU General Public License as published by
   *  the Free Software Foundation, either version 3 of the License, or
   *  (at your option) any later version.
   *
   *  AndroidIDE is distributed in the hope that it will be useful,
   *  but WITHOUT ANY WARRANTY; without even the implied warranty of
   *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   *  GNU General Public License for more details.
   *
   *  You should have received a copy of the GNU General Public License
   *   along with AndroidIDE.  If not, see <https://www.gnu.org/licenses/>.
   */
  
  /*
   * reserved comment block
   * DO NOT REMOVE OR ALTER!
   */
  /*
   * 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 1.2.4.1 2005/09/05 11:35:57 pvedula Exp $
   */
  
  package jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util;
  
  import jaxp.sun.org.apache.bcel.internal.generic.ALOAD;
  import jaxp.sun.org.apache.bcel.internal.generic.ASTORE;
  import jaxp.sun.org.apache.bcel.internal.generic.BranchHandle;
  import jaxp.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
  import jaxp.sun.org.apache.bcel.internal.generic.GOTO;
  import jaxp.sun.org.apache.bcel.internal.generic.IFEQ;
  import jaxp.sun.org.apache.bcel.internal.generic.IFNONNULL;
  import jaxp.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
  import jaxp.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
  import jaxp.sun.org.apache.bcel.internal.generic.Instruction;
  import jaxp.sun.org.apache.bcel.internal.generic.InstructionList;
  import jaxp.sun.org.apache.bcel.internal.generic.PUSH;
  import jaxp.sun.org.apache.xalan.internal.xsltc.compiler.Constants;
  import jaxp.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 jaxp.sun.org.apache.bcel.internal.generic.Type toJCType() {
          return jaxp.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     Type#translateTo
       */
      public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                              Type type) {
          if (type == Boolean) {
              translateTo(classGen, methodGen, (BooleanType) type);
          }
          else if (type == Real) {
              translateTo(classGen, methodGen, (RealType) type);
          }
          else if (type == Reference) {
              translateTo(classGen, methodGen, (ReferenceType) type);
          }
          else if (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     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     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     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     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     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(FATAL, err);
          }
      }
  
      /**
       * Translates an external (primitive) Java type into a string.
       *
       * @see     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(FATAL, err);
          }
      }
  
      /**
       * Translates an object of this type to its boxed representation.
       */
      public void translateBox(ClassGenerator classGen,
                               MethodGenerator methodGen) {
          translateTo(classGen, methodGen, 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);
      }
  }
  