booleval.java

来自「EXCEL read and write」· Java 代码 · 共 75 行

/*
* 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.hssf.record.formula.eval;

import org.apache.poi.hssf.record.formula.BoolPtg;
import org.apache.poi.hssf.record.formula.Ptg;

/**
 * @author Amol S. Deshmukh < amolweb at ya hoo dot com >
 *  
 */
public class BoolEval implements NumericValueEval, StringValueEval {

    private boolean value;
    
    public static final BoolEval FALSE = new BoolEval(false);
    
    public static final BoolEval TRUE = new BoolEval(true);
    
    /**
     * Convenience method for the following:<br/>
     * <code>(b ? BoolEval.TRUE : BoolEval.FALSE)</code>
     * @return a <tt>BoolEval</tt> instance representing <tt>b</tt>.
     */
    public static final BoolEval valueOf(boolean b) {
        // TODO - find / replace all occurrences
        return b ? TRUE : FALSE;
    }

    public BoolEval(Ptg ptg) {
        this.value = ((BoolPtg) ptg).getValue();
    }

    private BoolEval(boolean value) {
        this.value = value;
    }

    public boolean getBooleanValue() {
        return value;
    }

    public double getNumberValue() {
        return value ? 1 : 0;
    }

    public String getStringValue() {
        return value ? "TRUE" : "FALSE";
    }
    public String toString() {
        StringBuffer sb = new StringBuffer(64);
        sb.append(getClass().getName()).append(" [");
        sb.append(getStringValue());
        sb.append("]");
        return sb.toString();
    }
}