001: /*
002: * Copyright 2001-2004 The Apache Software Foundation.
003: *
004: * Licensed under the Apache License, Version 2.0 (the "License");
005: * you may not use this file except in compliance with the License.
006: * You may obtain a copy of the License at
007: *
008: * http://www.apache.org/licenses/LICENSE-2.0
009: *
010: * Unless required by applicable law or agreed to in writing, software
011: * distributed under the License is distributed on an "AS IS" BASIS,
012: * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013: * See the License for the specific language governing permissions and
014: * limitations under the License.
015: */
016: /*
017: * $Id: UseAttributeSets.java,v 1.12 2004/02/16 22:25:10 minchau Exp $
018: */
019:
020: package org.apache.xalan.xsltc.compiler;
021:
022: import java.util.StringTokenizer;
023: import java.util.Vector;
024:
025: import org.apache.bcel.generic.ConstantPoolGen;
026: import org.apache.bcel.generic.INVOKESPECIAL;
027: import org.apache.bcel.generic.InstructionList;
028: import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
029: import org.apache.xalan.xsltc.compiler.util.ErrorMsg;
030: import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
031: import org.apache.xalan.xsltc.compiler.util.Type;
032: import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
033:
034: /**
035: * @author Jacek Ambroziak
036: * @author Santiago Pericas-Geertsen
037: * @author Morten Jorgensen
038: */
039: final class UseAttributeSets extends Instruction {
040:
041: // Only error that can occur:
042: private final static String ATTR_SET_NOT_FOUND = "";
043:
044: // Contains the names of all references attribute sets
045: private final Vector _sets = new Vector(2);
046:
047: /**
048: * Constructur - define initial attribute sets to use
049: */
050: public UseAttributeSets(String setNames, Parser parser) {
051: setParser(parser);
052: addAttributeSets(setNames);
053: }
054:
055: /**
056: * This method is made public to enable an AttributeSet object to merge
057: * itself with another AttributeSet (including any other AttributeSets
058: * the two may inherit from).
059: */
060: public void addAttributeSets(String setNames) {
061: if ((setNames != null)
062: && (!setNames.equals(Constants.EMPTYSTRING))) {
063: final StringTokenizer tokens = new StringTokenizer(setNames);
064: while (tokens.hasMoreTokens()) {
065: final QName qname = getParser()
066: .getQNameIgnoreDefaultNs(tokens.nextToken());
067: _sets.add(qname);
068: }
069: }
070: }
071:
072: /**
073: * Do nada.
074: */
075: public Type typeCheck(SymbolTable stable) throws TypeCheckError {
076: return Type.Void;
077: }
078:
079: /**
080: * Generate a call to the method compiled for this attribute set
081: */
082: public void translate(ClassGenerator classGen,
083: MethodGenerator methodGen) {
084:
085: final ConstantPoolGen cpg = classGen.getConstantPool();
086: final InstructionList il = methodGen.getInstructionList();
087: final SymbolTable symbolTable = getParser().getSymbolTable();
088:
089: // Go through each attribute set and generate a method call
090: for (int i = 0; i < _sets.size(); i++) {
091: // Get the attribute set name
092: final QName name = (QName) _sets.elementAt(i);
093: // Get the AttributeSet reference from the symbol table
094: final AttributeSet attrs = symbolTable
095: .lookupAttributeSet(name);
096: // Compile the call to the set's method if the set exists
097: if (attrs != null) {
098: final String methodName = attrs.getMethodName();
099: il.append(classGen.loadTranslet());
100: il.append(methodGen.loadDOM());
101: il.append(methodGen.loadIterator());
102: il.append(methodGen.loadHandler());
103: final int method = cpg.addMethodref(classGen
104: .getClassName(), methodName, ATTR_SET_SIG);
105: il.append(new INVOKESPECIAL(method));
106: }
107: // Generate an error if the attribute set does not exist
108: else {
109: final Parser parser = getParser();
110: final String atrs = name.toString();
111: reportError(this, parser, ErrorMsg.ATTRIBSET_UNDEF_ERR,
112: atrs);
113: }
114: }
115: }
116: }
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