/*
 * 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: ParameterRef.java,v 1.2.4.1 2005/09/02 11:05:08 pvedula Exp $
 */

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

import com.sun.org.apache.bcel.internal.generic.CHECKCAST;
import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
import com.sun.org.apache.bcel.internal.generic.GETFIELD;
import com.sun.org.apache.bcel.internal.generic.INVOKEINTERFACE;
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.NodeSetType;
import com.sun.org.apache.xalan.internal.xsltc.runtime.BasisLibrary;

/**
 * @author Jacek Ambroziak
 * @author Santiago Pericas-Geertsen
 * @author Morten Jorgensen
 * @author Erwin Bolwidt <ejb@klomp.org>
 */
final class ParameterRef extends VariableRefBase {

    /**
     * Name of param being referenced.
     */
    QName _name = null;

    public ParameterRef(Param param) {
        super(param);
        _name = param._name;

    }

    public String toString() {
        return "parameter-ref("+_variable.getName()+'/'+_variable.getType()+')';
    }

    public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
        final ConstantPoolGen cpg = classGen.getConstantPool();
        final InstructionList il = methodGen.getInstructionList();

        /*
         * To fix bug 24518 related to setting parameters of the form
         * {namespaceuri}localName, which will get mapped to an instance
         * variable in the class.
         */
        final String name = BasisLibrary.mapQNameToJavaName (_name.toString());
        final String signature = _type.toSignature();

        if (_variable.isLocal()) {
            if (classGen.isExternal()) {
                Closure variableClosure = _closure;
                while (variableClosure != null) {
                    if (variableClosure.inInnerClass()) break;
                    variableClosure = variableClosure.getParentClosure();
                }

                if (variableClosure != null) {
                    il.append(ALOAD_0);
                    il.append(new GETFIELD(
                        cpg.addFieldref(variableClosure.getInnerClassName(),
                            name, signature)));
                }
                else {
                    il.append(_variable.loadInstruction());
                }
            }
            else {
                il.append(_variable.loadInstruction());
            }
        }
        else {
            final String className = classGen.getClassName();
            il.append(classGen.loadTranslet());
            if (classGen.isExternal()) {
                il.append(new CHECKCAST(cpg.addClass(className)));
            }
            il.append(new GETFIELD(cpg.addFieldref(className,name,signature)));
        }

        if (_variable.getType() instanceof NodeSetType) {
            // The method cloneIterator() also does resetting
            final int clone = cpg.addInterfaceMethodref(NODE_ITERATOR,
                                                       "cloneIterator",
                                                       "()" +
                                                        NODE_ITERATOR_SIG);
            il.append(new INVOKEINTERFACE(clone, 1));
        }
    }
}
