/*
 * Copyright (c) 2017, Oracle and/or its affiliates. All rights reserved.
 */
/*
 * 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.
 */

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

import com.sun.org.apache.bcel.internal.generic.ConstantPoolGen;
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 java.util.List;

/**
 * @author Morten Jorgensen
 * @LastModified: Oct 2017
 */
final class NamespaceUriCall extends NameBase {

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

    /**
     * Handles calls with one parameter (either node or node-set).
     */
    public NamespaceUriCall(QName fname, List<Expression> arguments) {
        super(fname, arguments);
    }

    /**
     * Translate code that leaves a node's namespace URI (as a String)
     * on the stack
     */
    public void translate(ClassGenerator classGen,
                          MethodGenerator methodGen) {
        final ConstantPoolGen cpg = classGen.getConstantPool();
        final InstructionList il = methodGen.getInstructionList();

        // Returns the string value for a node in the DOM
        final int getNamespace = cpg.addInterfaceMethodref(DOM_INTF,
                                                           "getNamespaceName",
                                                           "(I)"+STRING_SIG);
        super.translate(classGen, methodGen);
        il.append(new INVOKEINTERFACE(getNamespace, 2));
    }
}
