2 Copyright 2011 frank asseg
4 Licensed under the Apache License, Version 2.0 (the "License");
5 you may not use this file except in compliance with the License.
6 You may obtain a copy of the License at
8 http://www.apache.org/licenses/LICENSE-2.0
10 Unless required by applicable law or agreed to in writing, software
11 distributed under the License is distributed on an "AS IS" BASIS,
12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 See the License for the specific language governing permissions and
14 limitations under the License.
17 package de.congrace.exp4j;
20 import java.util.Stack;
23 * A {@link Token} for Numbers
25 * @author fas@congrace.de
28 class NumberToken extends CalculationToken {
30 private final double doubleValue;
33 * construct a new {@link NumberToken}
36 * the value of the number as a {@link String}
38 NumberToken(String value) {
40 this.doubleValue = Double.parseDouble(value);
44 public boolean equals(Object obj) {
45 if (obj instanceof NumberToken) {
46 final NumberToken t = (NumberToken) obj;
47 return t.getValue().equals(this.getValue());
53 public int hashCode() {
54 return getValue().hashCode();
58 void mutateStackForCalculation(Stack<Variable> stack, VariableSet variables) {
59 stack.push(new Variable("From number "+getValue()+" : "+hashCode(), this.doubleValue));
63 void mutateStackForInfixTranslation(Stack<Token> operatorStack, StringBuilder output) {
64 output.append(this.getValue()).append(' ');