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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.ctakes.dictionary.lookup;

import java.util.Collection;

/**
 * Base impl for a MetaDataHit implementation.
 * 
 * @author Mayo Clinic
 */
public abstract class AbstractBaseMetaDataHit implements MetaDataHit {
   private int _hashCode = Integer.MIN_VALUE;

   /**
    * Two MetaDataHits are equal if their Meta field name/value pairs
    * are equal.
    */
    public boolean equals( final MetaDataHit mdh ) {
       if ( getMetaFieldNames().size() != mdh.getMetaFieldNames().size()
             || getMetaFieldValues().size() != mdh.getMetaFieldValues().size()
             || !getMetaFieldNames().containsAll( mdh.getMetaFieldNames() ) ) {
          return false;
       }
       final Collection thisMetaFieldNames = getMetaFieldNames();
       for ( String name : thisMetaFieldNames ) {
          if ( !getMetaFieldValue( name ).equals( mdh.getMetaFieldValue( name ) ) ) {
             return false;
          }
       }
       return true;
    }

   // Added 12-17-2012 to increase duplicate filtering in DictionaryLookupAnnotator
   @Override
   public int hashCode() {
      if ( _hashCode == Integer.MIN_VALUE ) {
         _hashCode = 27 * getMetaFieldNames().hashCode() + getMetaFieldValues().hashCode();
      }
      return _hashCode;
   }

}