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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.
 */
package org.apache.woden.internal.wsdl20;

import javax.xml.namespace.QName;

import org.apache.woden.types.NCName;
import org.apache.woden.wsdl20.Binding;
import org.apache.woden.wsdl20.BindingMessageReference;
import org.apache.woden.wsdl20.BindingOperation;
import org.apache.woden.wsdl20.InterfaceMessageReference;
import org.apache.woden.wsdl20.InterfaceOperation;
import org.apache.woden.wsdl20.enumeration.Direction;
import org.apache.woden.wsdl20.fragids.BindingMessageReferencePart;
import org.apache.woden.wsdl20.fragids.FragmentIdentifier;
import org.apache.woden.wsdl20.xml.BindingMessageReferenceElement;
import org.apache.woden.wsdl20.xml.BindingOperationElement;
import org.apache.woden.wsdl20.xml.InterfaceMessageReferenceElement;
import org.apache.woden.wsdl20.xml.InterfaceOperationElement;
/**
 * This class represents the BindingMessageReference component of the 
 * WSDL 2.0 Component model and the <input> and <output> 
 * child elements of a WSDL binding <operation>. 
 * 
 * @author [email protected]
 */
public class BindingMessageReferenceImpl extends NestedImpl
                                         implements BindingMessageReference, 
                                                    BindingMessageReferenceElement 
{
    private Direction fDirection = null;
    private NCName fMessageLabel = null;

    /* ************************************************************
     *  BindingMessageReference interface methods (i.e. WSDL Component model)
     * ************************************************************/
    
    /* (non-Javadoc)
     * @see org.apache.woden.wsdl20.BindingMessageReference#getInterfaceMessageReference()
     * 
     * The "effective" message label of the binding message reference message must be equal to the 
     * message label of an interface message reference.
     * 
     * The WSDL 2.0 Part 1 spec says " Define the effective message label of a binding message reference 
     * element information item  to be either the actual value of the messageLabel attribute information 
     * item if it is present, or the {message label} of the unique placeholder message with {direction} equal 
     * to the message direction if the attribute information item is absent."
     * 
     * The code in this method currently just supports the first type of "effective" message label,
     * where the message label property IS present in the binding msg reference.
     * 
     */
    public InterfaceMessageReference getInterfaceMessageReference() 
    {
        InterfaceMessageReference intMsgRef = null;
        BindingOperation bindOp = (BindingOperation)getParent();
        InterfaceOperation intOp = bindOp.getInterfaceOperation();
        if(intOp != null)
        {
            //Determine the "effective" msg label for this binding msg ref.
            NCName effectiveMsgLabel = null;
            if(fMessageLabel != null) 
            {
                effectiveMsgLabel = fMessageLabel;
            } 
            else 
            {
                //TODO implement placeholder effective msg label, as per Part 1 of spec section 2.10.3
            }
            
            //Now match the effective msg label against the msg label of an interface msg reference.
            if(effectiveMsgLabel != null)
            {
                InterfaceMessageReference[] intMsgRefs = intOp.getInterfaceMessageReferences();
                for(int i=0; i