/*
 * 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.
 */
// copied from Apache Jackrabbit jackrabbit-data module; original class org.apache.jackrabbit.core.data.AbstractDataRecord

package org.apache.jackrabbit.oak.spi.blob.data;


/**
 * Abstract data record base class. This base class contains only
 * a reference to the data identifier of the record and implements
 * the standard {@link Object} equality, hash code, and string
 * representation methods based on the identifier.
 */
public abstract class AbstractDataRecord implements DataRecord {

    /**
     * The data store that contains this record.
     */
    private final AbstractDataStore store;

    /**
     * The binary identifier;
     */
    private final DataIdentifier identifier;

    /**
     * Creates a data record with the given identifier.
     *
     * @param identifier data identifier
     */
    public AbstractDataRecord(
            AbstractDataStore store, DataIdentifier identifier) {
        this.store = store;
        this.identifier = identifier;
    }

    /**
     * Returns the data identifier.
     *
     * @return data identifier
     */
    public DataIdentifier getIdentifier() {
        return identifier;
    }

    public String getReference() {
        return store.getReferenceFromIdentifier(identifier);
    }

    /**
     * Returns the string representation of the data identifier.
     *
     * @return string representation
     */
    public String toString() {
        return identifier.toString();
    }

    /**
     * Checks if the given object is a data record with the same identifier
     * as this one.
     *
     * @param object other object
     * @return <code>true</code> if the other object is a data record and has
     *         the same identifier as this one, <code>false</code> otherwise
     */
    public boolean equals(Object object) {
        return (object instanceof DataRecord)
            && identifier.equals(((DataRecord) object).getIdentifier());
    }

    /**
     * Returns the hash code of the data identifier.
     *
     * @return hash code
     */
    public int hashCode() {
        return identifier.hashCode();
    }

}
