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Java example source code file (NameBase.java)

This example Java source code file (NameBase.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

basis_library_class, constantpoolgen, expression, functioncall, instructionlist, methodgenerator, namebase, node_iterator_sig, object_sig, type, typecheckerror, util, vector

The NameBase.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed 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,v 1.2.4.1 2005/09/02 10:17:31 pvedula Exp $
 */

package com.sun.org.apache.xalan.internal.xsltc.compiler;

import java.util.Vector;

import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.INVOKESTATIC;
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.MethodGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;

/**
 * @author Morten Jorgensen
 * @author Erwin Bolwidt <ejb@klomp.org>
 */
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());
        }
    }
}

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