/*
 * 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.ode.jbi;

import javax.jbi.servicedesc.ServiceEndpoint;
import javax.xml.namespace.QName;

import org.w3c.dom.Document;
import org.w3c.dom.DocumentFragment;
import org.w3c.dom.Element;

import org.apache.ode.bpel.iapi.ContextException;
import org.apache.ode.bpel.iapi.Endpoint;
import org.apache.ode.bpel.iapi.EndpointReference;
import org.apache.ode.utils.DOMUtils;

/**
 * JBI-based implementation of the ODE {@link org.apache.ode.bpel.iapi.EndpointReference}
 * interface. This is basically a wrapper around the 
 * {@link javax.jbi.servicedesc.ServiceEndpoint} interface. 
 */
class JbiEndpointReference implements EndpointReference {

  private OdeContext _ode;
  private Endpoint _initialPartnerEndpoint;
  private ServiceEndpoint _se;
  private QName _type;
  
  JbiEndpointReference(Endpoint initialPartnerEndpoint, OdeContext ode) {
    _initialPartnerEndpoint = initialPartnerEndpoint;
    _ode = ode;
  }
  

  JbiEndpointReference(ServiceEndpoint se) {
    if (se == null)
      throw new NullPointerException("Null ServiceEndpoint");
    _se = se;
  }
  
  public JbiEndpointReference(ServiceEndpoint se, QName eprType) {
      this(se);
      _type = eprType;
  }

public Document toXML() {
    DocumentFragment fragment = getServiceEndpoint().getAsReference(_type);
    if (fragment == null)
      return null;
    Document doc = DOMUtils.newDocument();
    Element root = doc.createElementNS(SERVICE_REF_QNAME.getNamespaceURI(),SERVICE_REF_QNAME.getLocalPart());
    root.appendChild(doc.importNode(fragment,true));
    doc.appendChild(root);
    return doc;
  }

  public boolean equals(Object other) {
    if (other instanceof JbiEndpointReference)
      return getServiceEndpoint().getServiceName().equals(((JbiEndpointReference)other).getServiceEndpoint().getServiceName());
    return false;
  }
  
  public int hashCode() {
    return getServiceEndpoint().getServiceName().hashCode();
  }
  
  public String toString() {
      if (_se != null) {
          return "JbiEndpointReference[" + _se.getServiceName() + ":" + _se.getEndpointName() + "]";
      } else if (_initialPartnerEndpoint != null) {
          return "JbiEndpointReference[" + _initialPartnerEndpoint.serviceName + ":" + _initialPartnerEndpoint.portName + "]";
      } else {
          return "JbiEndpointReference[unknown]";
      }
  }

  ServiceEndpoint getServiceEndpoint() {
    if (_se == null) {
        if (_initialPartnerEndpoint != null) {
            _se = _ode.getContext().getEndpoint(_initialPartnerEndpoint.serviceName, _initialPartnerEndpoint.portName);
            if (_se == null) {
                throw new ContextException("Unknown endpoint: "  + _initialPartnerEndpoint, null);
            }
        }
    }
    return _se;
  }
}