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NoResolvedType.java
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NoResolvedType.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;
/**
* An unresolved type that was forward declared. So we know it exists,
* but that it wasn't pulled into this binary.
*
* In most cases, it behaves like a bottom type in the type lattice:
* no real type should be assigned to a NoResolvedType, but the
* NoResolvedType is a subtype of everything. In a few cases, it behaves
* like the unknown type: properties of this type are also NoResolved types,
* and comparisons to other types always have an unknown result.
*
* @author nicksantos@google.com (Nick Santos)
*/
class NoResolvedType extends NoType {
private static final long serialVersionUID = 1L;
NoResolvedType(JSTypeRegistry registry) {
super(registry);
}
@Override
public boolean isNoResolvedType() {
return true;
}
@Override
public boolean isNoType() {
return false;
}
@Override
public boolean isConstructor() {
return false;
}
@Override
public boolean isSubtype(JSType that) {
return isSubtype(that, ImplCache.create(), SubtypingMode.NORMAL);
}
@Override
protected boolean isSubtype(JSType that,
ImplCache implicitImplCache, SubtypingMode subtypingMode) {
if (JSType.isSubtypeHelper(this, that, implicitImplCache, subtypingMode)) {
return true;
} else {
return !that.isNoType();
}
}
@Override
StringBuilder appendTo(StringBuilder sb, boolean forAnnotations) {
return sb.append(forAnnotations ? "?" : "NoResolvedType");
}
}