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/*
 * Licensed to The Apereo Foundation under one or more contributor license
 * agreements. See the NOTICE file distributed with this work for additional
 * information regarding copyright ownership.
 *
 *
 * The Apereo Foundation licenses this file to you under the Educational
 * Community 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://opensource.org/licenses/ecl2.txt
 *
 * 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.opencastproject.util;

import static org.opencastproject.util.EqualsUtil.eq;
import static org.opencastproject.util.EqualsUtil.hash;

import java.io.Serializable;

/**
 * Declaration of an XML namespace binding which is the association of a prefix to a namespace URI (namespace name).
 * 
 * See W3C specification for details.
 */
public final class XmlNamespaceBinding implements Serializable {
  private static final long serialVersionUID = -3189348197739705012L;

  private final String prefix;
  private final String namespaceURI;

  /**
   * Bind a prefix to a namespace URI (namespace name).
   *
   * @param prefix a prefix or the empty string ({@link javax.xml.XMLConstants#DEFAULT_NS_PREFIX}) to bind
   *          the default namespace
   * @param namespaceURI Either a URI or the empty string ({@link javax.xml.XMLConstants#NULL_NS_URI}).
   *          See Declaring Namespaces
   *          for details about namespace declarations.
   */
  public XmlNamespaceBinding(String prefix, String namespaceURI) {
    this.prefix = RequireUtil.notNull(prefix, "prefix");
    this.namespaceURI = RequireUtil.notNull(namespaceURI, "namespaceURI");
  }

  /**
   * Constructor method.
   *
   * @see org.opencastproject.util.XmlNamespaceBinding#XmlNamespaceBinding(String, String)
   */
  public static XmlNamespaceBinding mk(String prefix, String namespaceURI) {
    return new XmlNamespaceBinding(prefix, namespaceURI);
  }

  public String getPrefix() {
    return prefix;
  }

  public String getNamespaceURI() {
    return namespaceURI;
  }

  @Override public int hashCode() {
    return hash(prefix, namespaceURI);
  }

  @Override public boolean equals(Object that) {
    return (this == that) || (that instanceof XmlNamespaceBinding && eqFields((XmlNamespaceBinding) that));
  }

  private boolean eqFields(XmlNamespaceBinding that) {
    return eq(prefix, that.prefix) && eq(namespaceURI, that.namespaceURI);
  }
}