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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() +
                "]";
    }
}