/*
 * 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.CachingDataRecord

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

import java.io.InputStream;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * CachingDataRecord which stores reference to {@link CachingDataStore}. This
 * class doesn't store any references to attributes but attributes are fetched
 * on demand from {@link CachingDataStore}.
 */
public class CachingDataRecord extends AbstractDataRecord {

    private static final Logger LOG = LoggerFactory.getLogger(CachingDataRecord.class);

    private final CachingDataStore store;

    public CachingDataRecord(CachingDataStore store, DataIdentifier identifier) {
        super(store, identifier);
        this.store = store;
    }

    @Override
    public long getLastModified() {
        try {
            return store.getLastModified(getIdentifier());
        } catch (DataStoreException dse) {
            LOG.info("exception in getLastModified for identifier ["
                + getIdentifier() + "]. returning 0.", dse);
            return 0;
        }
    }

    @Override
    public long getLength() throws DataStoreException {
        return store.getLength(getIdentifier());
    }

    @Override
    public InputStream getStream() throws DataStoreException {
        return store.getStream(getIdentifier());
    }

}
