| /** |
| * 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.ratis.examples.arithmetic.expression; |
| |
| import org.apache.ratis.util.Preconditions; |
| |
| import java.util.Map; |
| import java.util.Objects; |
| |
| public class DoubleValue implements Expression { |
| public static final DoubleValue ZERO = new DoubleValue(0); |
| public static final DoubleValue ONE = new DoubleValue(1); |
| |
| private final double value; |
| |
| public DoubleValue(double value) { |
| this.value = value; |
| } |
| |
| DoubleValue(byte[] buf, int offset) { |
| this(Utils.bytes2double(buf, offset + 1)); |
| Preconditions.assertTrue(buf[offset] == Type.DOUBLE.byteValue()); |
| } |
| |
| @Override |
| public int toBytes(byte[] buf, int offset) { |
| Preconditions.assertTrue(offset + length() <= buf.length); |
| buf[offset++] = Type.DOUBLE.byteValue(); |
| Utils.double2bytes(value, buf, offset); |
| return length(); |
| } |
| |
| @Override |
| public int length() { |
| return 9; |
| } |
| |
| @Override |
| public Double evaluate(Map<String, Double> variableMap) { |
| return value; |
| } |
| |
| @Override |
| public String toString() { |
| final long n = (long)value; |
| return n == value? String.valueOf(n): String.valueOf(value); |
| } |
| |
| @Override |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| if (o == null || getClass() != o.getClass()) { |
| return false; |
| } |
| DoubleValue that = (DoubleValue) o; |
| return Double.compare(that.value, value) == 0; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Objects.hash(value); |
| } |
| } |