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/*
  *
  *  *  Copyright 2014 Orient Technologies LTD (info(at)orientechnologies.com)
  *  *
  *  *  Licensed 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.
  *  *
  *  * For more information: http://www.orientechnologies.com
  *
  */
package com.orientechnologies.common.util;

import java.util.ArrayList;
import java.util.Collection;

/**
 *
 * Multiple key container that is used as key for {@link java.util.Map}.
 * Despite of the {@link java.util.List} order of keys does not matter, but unlike {@link java.util.Set} can contain
 * duplicate values.
 *
 */
public class OMultiKey {
    private final Collection keys;
    private final int hash;

    public OMultiKey(final Collection keys) {
        this.keys = new ArrayList(keys);
        hash = generateHashCode(keys);
    }

    private int generateHashCode(final Collection objects) {
        int total = 0;
        for (final Object object : objects) {
            total ^= object.hashCode();
        }
        return total;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public int hashCode() {
        return hash;
    }

    /**
     * Objects are equals if they contain the same amount of keys and these keys are equals.
     * Order of keys does not matter.
     *
     * @param o obj the reference object with which to compare.
     * @return  true if this object is the same as the obj
     *          argument; false otherwise.
     */
    @Override
    public boolean equals(final Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        final OMultiKey oMultiKey = (OMultiKey) o;

        if(keys.size() != oMultiKey.keys.size())
            return false;

        for (final Object inKey : keys) {
            if (!oMultiKey.keys.contains(inKey))
                return false;
        }
        return true;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String toString() {
        return "OMultiKey " + keys + "";
    }
}
 















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