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BooleanType.java
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BooleanType.java
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/*
*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (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.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1997-1999
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Bob Jervis
* Google Inc.
*
* Alternatively, the contents of this file may be used under the terms of
* the GNU General Public License Version 2 or later (the "GPL"), in which
* case the provisions of the GPL are applicable instead of those above. If
* you wish to allow use of your version of this file only under the terms of
* the GPL and not to allow others to use your version of this file under the
* MPL, indicate your decision by deleting the provisions above and replacing
* them with the notice and other provisions required by the GPL. If you do
* not delete the provisions above, a recipient may use your version of this
* file under either the MPL or the GPL.
*
* ***** END LICENSE BLOCK ***** */
package com.google.javascript.rhino.jstype;
import static com.google.javascript.rhino.jstype.TernaryValue.FALSE;
import static com.google.javascript.rhino.jstype.TernaryValue.UNKNOWN;
/**
* Boolean type.
*/
public class BooleanType extends ValueType {
private static final long serialVersionUID = 1L;
BooleanType(JSTypeRegistry registry) {
super(registry);
}
@Override
public TernaryValue testForEquality(JSType that) {
TernaryValue result = super.testForEquality(that);
if (result != null) {
return result;
}
if (that.isUnknownType() || that.isSubtypeOf(
getNativeType(JSTypeNative.NUMBER_STRING_BOOLEAN)) ||
that.isObject()) {
return UNKNOWN;
}
return FALSE;
}
@Override
public boolean isBooleanValueType() {
return true;
}
@Override
public boolean matchesNumberContext() {
return true;
}
@Override
public boolean matchesStringContext() {
return true;
}
@Override
public boolean matchesObjectContext() {
// TODO(user): Revisit this for ES4, which is stricter.
return true;
}
@Override
public JSType autoboxesTo() {
return getNativeType(JSTypeNative.BOOLEAN_OBJECT_TYPE);
}
@Override
StringBuilder appendTo(StringBuilder sb, boolean forAnnotations) {
return sb.append(getDisplayName());
}
@Override
public String getDisplayName() {
return "boolean";
}
@Override
public BooleanLiteralSet getPossibleToBooleanOutcomes() {
return BooleanLiteralSet.BOTH;
}
@Override
public <T> T visit(Visitor<T> visitor) {
return visitor.caseBooleanType();
}
}