106 lines
No EOL
2.8 KiB
Java
106 lines
No EOL
2.8 KiB
Java
// ESBoolean.java
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// FESI Copyright (c) Jean-Marc Lugrin, 1999
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package FESI.Data;
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import FESI.Exceptions.*;
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import FESI.Interpreter.Evaluator;
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/**
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* Boolean primitive value
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*/
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public final class ESBoolean extends ESPrimitive {
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// There is only one true and one false value (allowing
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// efficient comparisons)
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private static ESBoolean trueValue = new ESBoolean();
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private static ESBoolean falseValue = new ESBoolean();
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private ESBoolean() {
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}
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/**
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* Create a boolean primitive (either true or false)
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* by returning the predefined (unique) true or false values
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*
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* @return either trueValue or falseValue
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*/
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static public ESBoolean makeBoolean(boolean value) {
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return value ? trueValue: falseValue;
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}
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// overrides
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public String toDetailString() {
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return "ES:<" + (this==trueValue ? "true" : "false") + ">";
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}
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// overrides
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public int getTypeOf() {
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return EStypeBoolean;
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}
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// overrides
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public String getTypeofString() {
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return "boolean";
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}
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// overrides
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public String toString() {
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return this==trueValue ? "true" : "false";
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}
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// overrides
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public double doubleValue() {
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return this==trueValue ? 1 : 0;
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}
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// overrides
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public boolean booleanValue() {
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return this==trueValue;
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}
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// overrides
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public ESValue toESBoolean() {
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return this;
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}
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// overrides
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public ESValue toESObject(Evaluator evaluator) throws EcmaScriptException {
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BooleanPrototype theObject = null;
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ESObject bp = evaluator.getBooleanPrototype();
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theObject = new BooleanPrototype(bp, evaluator);
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theObject.value = this;
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return theObject;
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}
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// overrides
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public Object toJavaObject() {
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return new Boolean(this==trueValue);
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}
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// overrides
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/**
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* returns true as we implement booleanValue without an evaluator.
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* @return true
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*/
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public boolean isBooleanValue() {
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return true;
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}
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} |