1 /*--------------------------------------------------------------------------
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2 * Copyright 2009 Taro L. Saito
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4 * Licensed under the Apache License, Version 2.0 (the "License");
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5 * you may not use this file except in compliance with the License.
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6 * You may obtain a copy of the License at
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8 * http://www.apache.org/licenses/LICENSE-2.0
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10 * Unless required by applicable law or agreed to in writing, software
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11 * distributed under the License is distributed on an "AS IS" BASIS,
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12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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13 * See the License for the specific language governing permissions and
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14 * limitations under the License.
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15 *--------------------------------------------------------------------------*/
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16 //--------------------------------------
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19 // TernaryBoolean.java
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20 // Since: Jan 7, 2009 2:19:26 PM
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22 // $URL: http://www.xerial.org/svn/project/XerialJ/trunk/xerial-core/src/main/java/org/xerial/util/TernaryBoolean.java $
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24 //--------------------------------------
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25 package org.xerial.util;
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27 import org.xerial.core.XerialError;
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28 import org.xerial.core.XerialErrorCode;
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31 * Ternary boolean value (UNKNOWN, TRUE, FALSE)
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36 public enum TernaryBoolean {
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37 UNKNOWN, TRUE, FALSE;
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39 public boolean getBoolean()
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41 if (this == UNKNOWN)
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42 throw new XerialError(XerialErrorCode.NOT_INITIALIZED);
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44 return this == TRUE ? true : false;
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