/*
 * Copyright 2006 Amazon Technologies, Inc. or its affiliates.
 * Amazon, Amazon.com and Carbonado are trademarks or registered trademarks
 * of Amazon Technologies, Inc. or its affiliates.  All rights reserved.
 *
 * 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 com.amazon.carbonado.spi;

import java.io.InputStream;
import java.io.IOException;
import java.io.RandomAccessFile;

/**
 * InputStream that wraps a RandomAccessFile. A stream can be obtained for a
 * RandomAccessFile by getting the file descriptor and creating a
 * FileInputStream on it. Problem is that FileInputStream has a finalizer that
 * closes the RandomAccessFile.
 *
 * @author Brian S O'Neill
 */
public class RAFInputStream extends InputStream {
    private final RandomAccessFile mRAF;

    public RAFInputStream(RandomAccessFile raf) {
        mRAF = raf;
    }

    public int read() throws IOException {
        return mRAF.read();
    }

    public int read(byte[] b) throws IOException {
        return mRAF.read(b);
    }

    public int read(byte[] b, int offset, int length) throws IOException {
        return mRAF.read(b, offset, length);
    }

    public long skip(long n) throws IOException {
        if (n > Integer.MAX_VALUE) {
            n = Integer.MAX_VALUE;
        }
        return mRAF.skipBytes((int) n);
    }

    public void close() throws IOException {
        mRAF.close();
    }
}