/*

* 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 org.apache.orc.impl;

import org.apache.hadoop.hive.common.io.DiskRange;

import org.apache.hadoop.hive.common.io.DiskRangeList;

import java.nio.ByteBuffer;

/**

* The sections of stripe that we have read.

* This might not match diskRange - 1 disk range can be multiple buffer chunks,

* depending on DFS block boundaries.

* @since 1.1.0

*/

public class BufferChunk extends DiskRangeList {

private ByteBuffer chunk;

public BufferChunk(long offset, int length) {

super(offset, offset + length);

chunk = null;

}

public BufferChunk(ByteBuffer chunk, long offset) {

super(offset, offset + chunk.remaining());

this.chunk = chunk;

}

public void setChunk(ByteBuffer chunk) {

this.chunk = chunk;

}

@Override

public boolean hasData() {

return chunk != null;

}

@Override

public final String toString() {

if (chunk == null) {

return "data range[" + offset + ", " + end +")";

} else {

boolean makesSense = chunk.remaining() == (end - offset);

return "data range [" + offset + ", " + end + "), size: " + chunk.remaining()

+ (makesSense ? "" : "(!)") + " type: " +

(chunk.isDirect() ? "direct" : "array-backed");

}

}

@Override

public DiskRange sliceAndShift(long offset, long end, long shiftBy) {

assert offset <= end && offset >= this.offset && end <= this.end;

assert offset + shiftBy >= 0;

ByteBuffer sliceBuf = chunk.slice();

int newPos = (int) (offset - this.offset);

int newLimit = newPos + (int) (end - offset);

try {

sliceBuf.position(newPos);

sliceBuf.limit(newLimit);

} catch (Throwable t) {

throw new RuntimeException(

"Failed to slice buffer chunk with range" + " [" + this.offset + ", " + this.end

+ "), position: " + chunk.position() + " limit: " + chunk.limit() + ", "

+ (chunk.isDirect() ? "direct" : "array") + "; to [" + offset + ", " + end + ") "

+ t.getClass(), t);

}

return new BufferChunk(sliceBuf, offset + shiftBy);

}

@Override

public boolean equals(Object other) {

if (other == null || other.getClass() != getClass()) {

return false;

}

BufferChunk ob = (BufferChunk) other;

return chunk.equals(ob.chunk);

}

@Override

public int hashCode() {

return chunk.hashCode();

}

@Override

public ByteBuffer getData() {

return chunk;

}

}