| /** |
| * |
| * 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.regionserver.querymatcher; |
| |
| import org.apache.hadoop.hbase.classification.InterfaceAudience; |
| |
| /** |
| * Simple wrapper for a byte buffer and a counter. Does not copy. |
| * <p> |
| * NOT thread-safe because it is not used in a multi-threaded context, yet. |
| */ |
| @InterfaceAudience.Private |
| class ColumnCount { |
| private final byte[] bytes; |
| private final int offset; |
| private final int length; |
| private int count; |
| |
| /** |
| * Constructor |
| * @param column the qualifier to count the versions for |
| */ |
| public ColumnCount(byte[] column) { |
| this(column, 0); |
| } |
| |
| /** |
| * Constructor |
| * @param column the qualifier to count the versions for |
| * @param count initial count |
| */ |
| public ColumnCount(byte[] column, int count) { |
| this(column, 0, column.length, count); |
| } |
| |
| /** |
| * Constuctor |
| * @param column the qualifier to count the versions for |
| * @param offset in the passed buffer where to start the qualifier from |
| * @param length of the qualifier |
| * @param count initial count |
| */ |
| public ColumnCount(byte[] column, int offset, int length, int count) { |
| this.bytes = column; |
| this.offset = offset; |
| this.length = length; |
| this.count = count; |
| } |
| |
| /** |
| * @return the buffer |
| */ |
| public byte[] getBuffer() { |
| return this.bytes; |
| } |
| |
| /** |
| * @return the offset |
| */ |
| public int getOffset() { |
| return this.offset; |
| } |
| |
| /** |
| * @return the length |
| */ |
| public int getLength() { |
| return this.length; |
| } |
| |
| /** |
| * Decrement the current version count |
| * @return current count |
| */ |
| public int decrement() { |
| return --count; |
| } |
| |
| /** |
| * Increment the current version count |
| * @return current count |
| */ |
| public int increment() { |
| return ++count; |
| } |
| |
| /** |
| * Set the current count to a new count |
| * @param count new count to set |
| */ |
| public void setCount(int count) { |
| this.count = count; |
| } |
| } |