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   *  AndroidIDE is distributed in the hope that it will be useful,
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   *  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/>.
   */
  
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   * 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: NodeType.java,v 1.2.4.1 2005/09/05 11:24:25 pvedula Exp $
   */
  
  package jaxp.sun.org.apache.xalan.internal.xsltc.compiler.util;
  
  import jaxp.sun.org.apache.bcel.internal.generic.BranchHandle;
  import jaxp.sun.org.apache.bcel.internal.generic.CHECKCAST;
  import jaxp.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
  import jaxp.sun.org.apache.bcel.internal.generic.GETFIELD;
  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.ILOAD;
  import jaxp.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
  import jaxp.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
  import jaxp.sun.org.apache.bcel.internal.generic.ISTORE;
  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.NEW;
  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;
  import jaxp.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 jaxp.sun.org.apache.bcel.internal.generic.Type toJCType() {
          return jaxp.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     Type#translateTo
       */
      public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                              Type type) {
          if (type == String) {
              translateTo(classGen, methodGen, (StringType) type);
          }
          else if (type == Boolean) {
              translateTo(classGen, methodGen, (BooleanType) type);
          }
          else if (type == Real) {
              translateTo(classGen, methodGen, (RealType) type);
          }
          else if (type == NodeSet) {
              translateTo(classGen, methodGen, (NodeSetType) type);
          }
          else if (type == Reference) {
              translateTo(classGen, methodGen, (ReferenceType) type);
          }
          else if (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     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     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     Type#translateTo
       */
      public void translateTo(ClassGenerator classGen, MethodGenerator methodGen,
                              RealType type) {
          translateTo(classGen, methodGen, String);
          translateTo(classGen, methodGen, Real);
      }
  
      /**
       * Expects a node on the stack and pushes a singleton node-set. Singleton
       * iterators are already started after construction.
       *
       * @see     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     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     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     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, 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, 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);
      }
  }
  