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/*
 * Copyright 2012-2013 the original author or authors.
 *
 * 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.
 */

package io.joshworks.snappy.loader.data;

import java.io.ByteArrayInputStream;
import java.io.InputStream;

/**
 * {@link RandomAccessData} implementation backed by a byte array.
 *
 * @author Phillip Webb
 */
public class ByteArrayRandomAccessData implements RandomAccessData {

    private final byte[] bytes;

    private final long offset;

    private final long length;

    public ByteArrayRandomAccessData(byte[] bytes) {
        this(bytes, 0, (bytes == null ? 0 : bytes.length));
    }

    public ByteArrayRandomAccessData(byte[] bytes, long offset, long length) {
        this.bytes = (bytes == null ? new byte[0] : bytes);
        this.offset = offset;
        this.length = length;
    }

    @Override
    public InputStream getInputStream(ResourceAccess access) {
        return new ByteArrayInputStream(this.bytes, (int) this.offset, (int) this.length);
    }

    @Override
    public RandomAccessData getSubsection(long offset, long length) {
        return new ByteArrayRandomAccessData(this.bytes, this.offset + offset, length);
    }

    @Override
    public long getSize() {
        return this.length;
    }

}