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Common functionality for HBase
/*
* 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.hadoop.hbase.util;
import org.apache.yetus.audience.InterfaceAudience;
/**
*
* Extends {@link ByteRange} with additional methods to support tracking a
* consumers position within the viewport. The API is extended with methods
* {@link #get()} and {@link #put(byte)} for interacting with the backing
* array from the current position forward. This frees the caller from managing
* their own index into the array.
*
*
* Designed to be a slimmed-down, mutable alternative to {@link java.nio.ByteBuffer}.
*
*/
@InterfaceAudience.Public
public interface PositionedByteRange extends ByteRange {
// net new API is here.
/**
* The current {@code position} marker. This valuae is 0-indexed, relative to
* the beginning of the range.
*/
public int getPosition();
/**
* Update the {@code position} index. May not be greater than {@code length}.
* @param position the new position in this range.
* @return this.
*/
public PositionedByteRange setPosition(int position);
/**
* The number of bytes remaining between position and the end of the range.
*/
public int getRemaining();
/**
* Retrieve the next byte from this range without incrementing position.
*/
public byte peek();
/**
* Retrieve the next byte from this range.
*/
public byte get();
/**
* Retrieve the next short value from this range.
*/
public short getShort();
/**
* Retrieve the next int value from this range.
*/
public int getInt();
/**
* Retrieve the next long value from this range.
*/
public long getLong();
/**
* Retrieve the next long value, which is stored as VLong, from this range
* @return the long value which is stored as VLong
*/
public long getVLong();
/**
* Fill {@code dst} with bytes from the range, starting from {@code position}.
* This range's {@code position} is incremented by the length of {@code dst},
* the number of bytes copied.
* @param dst the destination of the copy.
* @return this.
*/
public PositionedByteRange get(byte[] dst);
/**
* Fill {@code dst} with bytes from the range, starting from the current
* {@code position}. {@code length} bytes are copied into {@code dst},
* starting at {@code offset}. This range's {@code position} is incremented
* by the number of bytes copied.
* @param dst the destination of the copy.
* @param offset the offset into {@code dst} to start the copy.
* @param length the number of bytes to copy into {@code dst}.
* @return this.
*/
public PositionedByteRange get(byte[] dst, int offset, int length);
/**
* Store {@code val} at the next position in this range.
* @param val the new value.
* @return this.
*/
public PositionedByteRange put(byte val);
/**
* Store short {@code val} at the next position in this range.
* @param val the new value.
* @return this.
*/
public PositionedByteRange putShort(short val);
/**
* Store int {@code val} at the next position in this range.
* @param val the new value.
* @return this.
*/
public PositionedByteRange putInt(int val);
/**
* Store long {@code val} at the next position in this range.
* @param val the new value.
* @return this.
*/
public PositionedByteRange putLong(long val);
/**
* Store the long {@code val} at the next position as a VLong
* @param val the value to store
* @return number of bytes written
*/
public int putVLong(long val);
/**
* Store the content of {@code val} in this range, starting at the next position.
* @param val the new value.
* @return this.
*/
public PositionedByteRange put(byte[] val);
/**
* Store {@code length} bytes from {@code val} into this range. Bytes from
* {@code val} are copied starting at {@code offset} into the range, starting at
* the current position.
* @param val the new value.
* @param offset the offset in {@code val} from which to start copying.
* @param length the number of bytes to copy from {@code val}.
* @return this.
*/
public PositionedByteRange put(byte[] val, int offset, int length);
/**
* Limits the byte range upto a specified value. Limit cannot be greater than
* capacity
*
* @param limit
* @return PositionedByteRange
*/
public PositionedByteRange setLimit(int limit);
/**
* Return the current limit
*
* @return limit
*/
public int getLimit();
// override parent interface declarations to return this interface.
@Override
public PositionedByteRange unset();
@Override
public PositionedByteRange set(int capacity);
@Override
public PositionedByteRange set(byte[] bytes);
@Override
public PositionedByteRange set(byte[] bytes, int offset, int length);
@Override
public PositionedByteRange setOffset(int offset);
@Override
public PositionedByteRange setLength(int length);
@Override
public PositionedByteRange get(int index, byte[] dst);
@Override
public PositionedByteRange get(int index, byte[] dst, int offset, int length);
@Override
public PositionedByteRange put(int index, byte val);
@Override
public PositionedByteRange putShort(int index, short val);
@Override
public PositionedByteRange putInt(int index, int val);
@Override
public PositionedByteRange putLong(int index, long val);
@Override
public PositionedByteRange put(int index, byte[] val);
@Override
public PositionedByteRange put(int index, byte[] val, int offset, int length);
@Override
public PositionedByteRange deepCopy();
@Override
public PositionedByteRange shallowCopy();
@Override
public PositionedByteRange shallowCopySubRange(int innerOffset, int copyLength);
}