com.ricemap.spateDB.io.MemoryInputStream.java Source code

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Here is the source code for com.ricemap.spateDB.io.MemoryInputStream.java

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/*
 * 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.
 */
package com.ricemap.spateDB.io;

import java.io.ByteArrayInputStream;
import java.io.IOException;

import org.apache.hadoop.fs.PositionedReadable;
import org.apache.hadoop.fs.Seekable;

public class MemoryInputStream extends ByteArrayInputStream implements Seekable, PositionedReadable {

    int originalOffset;

    public MemoryInputStream(byte[] buf, int offset, int length) {
        super(buf, offset, length);
        originalOffset = offset;
    }

    public MemoryInputStream(byte[] buf) {
        super(buf);
    }

    public long getPos() {
        return pos - originalOffset;
    }

    @Override
    public void seek(long pos) throws IOException {
        this.mark = originalOffset;
        this.reset();
        this.skip(pos);
    }

    @Override
    public boolean seekToNewSource(long targetPos) throws IOException {
        return false;
    }

    @Override
    public int read(long position, byte[] buffer, int offset, int length) throws IOException {
        // TODO Auto-generated method stub
        return 0;
    }

    @Override
    public void readFully(long position, byte[] buffer, int offset, int length) throws IOException {
        System.arraycopy(buf, (int) (originalOffset + position), buffer, offset, length);
    }

    @Override
    public void readFully(long position, byte[] buffer) throws IOException {
        readFully(position, buffer, 0, buffer.length);
    }
}