/*
* @(#)$Id: IdKeyPattern.java,v 1.8 2003/01/30 18:46:00 mkwan Exp $
*
* The Apache Software License, Version 1.1
*
*
* Copyright (c) 2001-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution,
* if any, must include the following acknowledgment:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xalan" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache",
* nor may "Apache" appear in their name, without prior written
* permission of the Apache Software Foundation.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 2001, Sun
* Microsystems., http://www.sun.com. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*
* @author Jacek Ambroziak
* @author Santiago Pericas-Geertsen
*
*/
package org.apache.xalan.xsltc.compiler;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.GOTO;
import org.apache.bcel.generic.IFNE;
import org.apache.bcel.generic.INVOKEVIRTUAL;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.PUSH;
import org.apache.xalan.xsltc.compiler.util.ClassGenerator;
import org.apache.xalan.xsltc.compiler.util.MethodGenerator;
import org.apache.xalan.xsltc.compiler.util.Type;
import org.apache.xalan.xsltc.compiler.util.TypeCheckError;
abstract class IdKeyPattern extends LocationPathPattern {
protected RelativePathPattern _left = null;;
private String _index = null;
private String _value = null;;
public IdKeyPattern(String index, String value) {
_index = index;
_value = value;
}
public String getIndexName() {
return(_index);
}
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
return Type.NodeSet;
}
public boolean isWildcard() {
return false;
}
public void setLeft(RelativePathPattern left) {
_left = left;
}
public StepPattern getKernelPattern() {
return(null);
}
public void reduceKernelPattern() { }
public String toString() {
return "id/keyPattern(" + _index + ", " + _value + ')';
}
/**
* This method is called when the constructor is compiled in
* Stylesheet.compileConstructor() and not as the syntax tree is traversed.
*/
public void translate(ClassGenerator classGen,
MethodGenerator methodGen) {
final ConstantPoolGen cpg = classGen.getConstantPool();
final InstructionList il = methodGen.getInstructionList();
// Returns the KeyIndex object of a given name
final int getKeyIndex = cpg.addMethodref(TRANSLET_CLASS,
"getKeyIndex",
"(Ljava/lang/String;)"+
KEY_INDEX_SIG);
// Initialises a KeyIndex to return nodes with specific values
final int lookupId = cpg.addMethodref(KEY_INDEX_CLASS,
"containsID",
"(ILjava/lang/Object;)I");
final int lookupKey = cpg.addMethodref(KEY_INDEX_CLASS,
"containsKey",
"(ILjava/lang/Object;)I");
// Call getKeyIndex in AbstractTranslet with the name of the key
// to get the index for this key (which is also a node iterator).
il.append(classGen.loadTranslet());
il.append(new PUSH(cpg,_index));
il.append(new INVOKEVIRTUAL(getKeyIndex));
// Now use the value in the second argument to determine what nodes
// the iterator should return.
il.append(SWAP);
il.append(new PUSH(cpg,_value));
if (this instanceof IdPattern)
il.append(new INVOKEVIRTUAL(lookupId));
else
il.append(new INVOKEVIRTUAL(lookupKey));
_trueList.add(il.append(new IFNE(null)));
_falseList.add(il.append(new GOTO(null)));
}
}