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Various Java Utils

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/**
 * commons - Various Java Utils
 * Copyright (C) 2009  Adrian Cristian Ionescu - https://github.com/acionescu
 *
 * 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 net.segoia.util.calculator.operators;

import java.util.HashMap;
import java.util.Map;

public class ConstantOperator extends SingleArgumentOperator{
    private Map constants = new HashMap();
    
    public ConstantOperator(){
	constants.put("pi", Math.PI);
	constants.put("e", Math.E);
    }
    
    @Override
    public OperatorOutput doOperation(OperatorInput input) {
	return new OperatorOutput(constants.get(input.getStringArgument(0)));
    }

}