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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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/*
* 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.
*/
/*
 * Created on May 8, 2005
 *
 */
package org.apache.poi.ss.formula.eval;

import org.apache.poi.ss.formula.ptg.IntPtg;
import org.apache.poi.ss.formula.ptg.NumberPtg;
import org.apache.poi.ss.formula.ptg.Ptg;
import org.apache.poi.ss.util.NumberToTextConverter;

/**
 * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
 *  
 */
public final class NumberEval implements NumericValueEval, StringValueEval {
    
    public static final NumberEval ZERO = new NumberEval(0);

    private final double _value;
    private String _stringValue;

    public NumberEval(Ptg ptg) {
        if (ptg == null) {
            throw new IllegalArgumentException("ptg must not be null");
        }
        if (ptg instanceof IntPtg) {
            _value = ((IntPtg) ptg).getValue();
        } else if (ptg instanceof NumberPtg) {
            _value = ((NumberPtg) ptg).getValue();
        } else {
            throw new IllegalArgumentException("bad argument type (" + ptg.getClass().getName() + ")");
        }
    }

    public NumberEval(double value) {
        _value = value;
    }

    public double getNumberValue() {
        return _value;
    }

    public String getStringValue() {
        if (_stringValue == null) {
            _stringValue = NumberToTextConverter.toText(_value);
        }
        return _stringValue;
    }
    public final String toString() {
        return getClass().getName() + " [" +
                getStringValue() +
                "]";
    }
}