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Xalan-Java is an XSLT processor for transforming XML documents into HTML, text, or other XML document types. It implements XSL Transformations (XSLT) Version 1.0 and XML Path Language (XPath) Version 1.0 and can be used from the command line, in an applet or a servlet, or as a module in other program.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. 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 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: NameBase.java 468650 2006-10-28 07:03:30Z minchau $
 */

package org.apache.xalan.xsltc.compiler;

import java.util.Vector;

import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.INVOKESTATIC;
import org.apache.bcel.generic.InstructionList;
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;

/**
 * @author Morten Jorgensen
 * @author Erwin Bolwidt 
 */
class NameBase extends FunctionCall {

    private Expression _param = null;
    private Type       _paramType = Type.Node;

    /**
     * Handles calls with no parameter (current node is implicit parameter).
     */
    public NameBase(QName fname) {
	super(fname);
    }

    /**
     * Handles calls with one parameter (either node or node-set).
     */
    public NameBase(QName fname, Vector arguments) {
	super(fname, arguments);
	_param = argument(0);
    }


    /**
     * Check that we either have no parameters or one parameter that is
     * either a node or a node-set.
     */
    public Type typeCheck(SymbolTable stable) throws TypeCheckError {

	// Check the argument type (if any)
	switch(argumentCount()) {
	case 0:
	    _paramType = Type.Node;
	    break;
	case 1:
	    _paramType = _param.typeCheck(stable);
	    break;
	default:
	    throw new TypeCheckError(this);
	}

	// The argument has to be a node, a node-set or a node reference
	if ((_paramType != Type.NodeSet) &&
	    (_paramType != Type.Node) &&
	    (_paramType != Type.Reference)) {
	    throw new TypeCheckError(this);
	}

	return (_type = Type.String);
    }

    public Type getType() {
	return _type;
    }

    /**
     * Translate the code required for getting the node for which the
     * QName, local-name or namespace URI should be extracted.
     */
    public void translate(ClassGenerator classGen,
			  MethodGenerator methodGen) {
	final ConstantPoolGen cpg = classGen.getConstantPool();
	final InstructionList il = methodGen.getInstructionList();

	il.append(methodGen.loadDOM());
	
	// Function was called with no parameters
	if (argumentCount() == 0) {
	    il.append(methodGen.loadContextNode());
	}
	// Function was called with node parameter
	else if (_paramType == Type.Node) {
	    _param.translate(classGen, methodGen);
	}
	else if (_paramType == Type.Reference) {
	    _param.translate(classGen, methodGen);
	    il.append(new INVOKESTATIC(cpg.addMethodref
				       (BASIS_LIBRARY_CLASS,
					"referenceToNodeSet",
					"("
					+ OBJECT_SIG
					+ ")"
					+ NODE_ITERATOR_SIG)));
	    il.append(methodGen.nextNode());
	}
	// Function was called with node-set parameter
	else {
	    _param.translate(classGen, methodGen);
	    _param.startIterator(classGen, methodGen);
	    il.append(methodGen.nextNode());
	}
    }
}