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 * Licensed to the Apache Software Foundation (ASF) under one or more
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 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
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package com.sun.org.apache.xalan.internal.xsltc.compiler;

import java.util.StringTokenizer;
import java.util.Vector;

import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.INVOKESPECIAL;
import com.sun.org.apache.bcel.internal.generic.InstructionList;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;

Author:Jacek Ambroziak, Santiago Pericas-Geertsen, Morten Jorgensen
/** * @author Jacek Ambroziak * @author Santiago Pericas-Geertsen * @author Morten Jorgensen */
final class UseAttributeSets extends Instruction { // Only error that can occur: private final static String ATTR_SET_NOT_FOUND = ""; // Contains the names of all references attribute sets private final Vector _sets = new Vector(2);
Constructur - define initial attribute sets to use
/** * Constructur - define initial attribute sets to use */
public UseAttributeSets(String setNames, Parser parser) { setParser(parser); addAttributeSets(setNames); }
This method is made public to enable an AttributeSet object to merge itself with another AttributeSet (including any other AttributeSets the two may inherit from).
/** * This method is made public to enable an AttributeSet object to merge * itself with another AttributeSet (including any other AttributeSets * the two may inherit from). */
public void addAttributeSets(String setNames) { if ((setNames != null) && (!setNames.equals(Constants.EMPTYSTRING))) { final StringTokenizer tokens = new StringTokenizer(setNames); while (tokens.hasMoreTokens()) { final QName qname = getParser().getQNameIgnoreDefaultNs(tokens.nextToken()); _sets.add(qname); } } }
Do nada.
/** * Do nada. */
public Type typeCheck(SymbolTable stable) throws TypeCheckError { return Type.Void; }
Generate a call to the method compiled for this attribute set
/** * Generate a call to the method compiled for this attribute set */
public void translate(ClassGenerator classGen, MethodGenerator methodGen) { final ConstantPoolGen cpg = classGen.getConstantPool(); final InstructionList il = methodGen.getInstructionList(); final SymbolTable symbolTable = getParser().getSymbolTable(); // Go through each attribute set and generate a method call for (int i=0; i<_sets.size(); i++) { // Get the attribute set name final QName name = (QName)_sets.elementAt(i); // Get the AttributeSet reference from the symbol table final AttributeSet attrs = symbolTable.lookupAttributeSet(name); // Compile the call to the set's method if the set exists if (attrs != null) { final String methodName = attrs.getMethodName(); il.append(classGen.loadTranslet()); il.append(methodGen.loadDOM()); il.append(methodGen.loadIterator()); il.append(methodGen.loadHandler()); il.append(methodGen.loadCurrentNode()); final int method = cpg.addMethodref(classGen.getClassName(), methodName, ATTR_SET_SIG); il.append(new INVOKESPECIAL(method)); } // Generate an error if the attribute set does not exist else { final Parser parser = getParser(); final String atrs = name.toString(); reportError(this, parser, ErrorMsg.ATTRIBSET_UNDEF_ERR, atrs); } } } }