Java tutorial
/* * Copyright 2011 Facebook, Inc. * * 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.facebook.tsdb.tsdash.server.model; import org.apache.hadoop.hbase.util.Bytes; import org.json.simple.JSONArray; import com.facebook.tsdb.tsdash.server.data.hbase.DataPointQualifier; public class DataPoint implements Comparable<DataPoint> { public long ts; public double value; public DataPoint(long ts, double value) { this.ts = ts; this.value = value; } public int intValue() { return (int) value; } @Override public String toString() { return "(" + ts + " -> " + String.format("%.3f", value) + ")"; } public static double decodeValue(byte[] encoded, byte[] qualifier) { if (DataPointQualifier.isFloat(qualifier)) { if (encoded.length == 8) { return Float.intBitsToFloat(Bytes.toInt(encoded, 4)); } else { // length is 4 return Float.intBitsToFloat(Bytes.toInt(encoded)); } } return Bytes.toLong(encoded); } @Override public int compareTo(DataPoint other) { return (int) (ts - other.ts); } @SuppressWarnings("unchecked") public JSONArray toJSONObject() { JSONArray obj = new JSONArray(); obj.add(ts); obj.add(value); return obj; } }