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1   /*
2    * reserved comment block
3    * DO NOT REMOVE OR ALTER!
4    */
5   /*
6    * Copyright 2001-2004 The Apache Software Foundation.
7    *
8    * Licensed under the Apache License, Version 2.0 (the "License");
9    * you may not use this file except in compliance with the License.
10   * You may obtain a copy of the License at
11   *
12   *     http://www.apache.org/licenses/LICENSE-2.0
13   *
14   * Unless required by applicable law or agreed to in writing, software
15   * distributed under the License is distributed on an "AS IS" BASIS,
16   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17   * See the License for the specific language governing permissions and
18   * limitations under the License.
19   */
20  /*
21   * $Id: CopyOf.java,v 1.2.4.1 2005/09/01 12:16:22 pvedula Exp $
22   */
23  
24  package com.sun.org.apache.xalan.internal.xsltc.compiler;
25  
26  import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
27  import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
28  import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
29  import com.sun.org.apache.bcel.internal.generic.INVOKEVIRTUAL;
30  import com.sun.org.apache.bcel.internal.generic.InstructionList;
31  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
32  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
33  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
34  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.NodeSetType;
35  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.NodeType;
36  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ReferenceType;
37  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ResultTreeType;
38  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
39  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
40  import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Util;
41  
42  /**
43   * @author Jacek Ambroziak
44   * @author Santiago Pericas-Geertsen
45   */
46  final class CopyOf extends Instruction {
47      private Expression _select;
48  
49      public void display(int indent) {
50          indent(indent);
51          Util.println("CopyOf");
52          indent(indent + IndentIncrement);
53          Util.println("select " + _select.toString());
54      }
55  
56      public void parseContents(Parser parser) {
57          _select = parser.parseExpression(this, "select", null);
58          // make sure required attribute(s) have been set
59          if (_select.isDummy()) {
60              reportError(this, parser, ErrorMsg.REQUIRED_ATTR_ERR, "select");
61              return;
62          }
63      }
64  
65      public Type typeCheck(SymbolTable stable) throws TypeCheckError {
66          final Type tselect = _select.typeCheck(stable);
67          if (tselect instanceof NodeType ||
68              tselect instanceof NodeSetType ||
69              tselect instanceof ReferenceType ||
70              tselect instanceof ResultTreeType) {
71              // falls through
72          }
73          else {
74              _select = new CastExpr(_select, Type.String);
75          }
76          return Type.Void;
77      }
78  
79      public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
80          final ConstantPoolGen cpg = classGen.getConstantPool();
81          final InstructionList il = methodGen.getInstructionList();
82          final Type tselect = _select.getType();
83  
84          final String CPY1_SIG = "("+NODE_ITERATOR_SIG+TRANSLET_OUTPUT_SIG+")V";
85          final int cpy1 = cpg.addInterfaceMethodref(DOM_INTF, "copy", CPY1_SIG);
86  
87          final String CPY2_SIG = "("+NODE_SIG+TRANSLET_OUTPUT_SIG+")V";
88          final int cpy2 = cpg.addInterfaceMethodref(DOM_INTF, "copy", CPY2_SIG);
89  
90          final String getDoc_SIG = "()"+NODE_SIG;
91          final int getDoc = cpg.addInterfaceMethodref(DOM_INTF, "getDocument", getDoc_SIG);
92  
93  
94          if (tselect instanceof NodeSetType) {
95              il.append(methodGen.loadDOM());
96  
97              // push NodeIterator
98              _select.translate(classGen, methodGen);
99              _select.startIterator(classGen, methodGen);
100 
101             // call copy from the DOM 'library'
102             il.append(methodGen.loadHandler());
103             il.append(new INVOKEINTERFACE(cpy1, 3));
104         }
105         else if (tselect instanceof NodeType) {
106             il.append(methodGen.loadDOM());
107             _select.translate(classGen, methodGen);
108             il.append(methodGen.loadHandler());
109             il.append(new INVOKEINTERFACE(cpy2, 3));
110         }
111         else if (tselect instanceof ResultTreeType) {
112             _select.translate(classGen, methodGen);
113             // We want the whole tree, so we start with the root node
114             il.append(DUP); //need a pointer to the DOM ;
115             il.append(new INVOKEINTERFACE(getDoc,1)); //ICONST_0);
116             il.append(methodGen.loadHandler());
117             il.append(new INVOKEINTERFACE(cpy2, 3));
118         }
119         else if (tselect instanceof ReferenceType) {
120             _select.translate(classGen, methodGen);
121             il.append(methodGen.loadHandler());
122             il.append(methodGen.loadCurrentNode());
123             il.append(methodGen.loadDOM());
124             final int copy = cpg.addMethodref(BASIS_LIBRARY_CLASS, "copy",
125                                               "("
126                                               + OBJECT_SIG
127                                               + TRANSLET_OUTPUT_SIG
128                                               + NODE_SIG
129                                               + DOM_INTF_SIG
130                                               + ")V");
131             il.append(new INVOKESTATIC(copy));
132         }
133         else {
134             il.append(classGen.loadTranslet());
135             _select.translate(classGen, methodGen);
136             il.append(methodGen.loadHandler());
137             il.append(new INVOKEVIRTUAL(cpg.addMethodref(TRANSLET_CLASS,
138                                                          CHARACTERSW,
139                                                          CHARACTERSW_SIG)));
140         }
141 
142     }
143 }