author | bpatel |
Sat, 29 Mar 2014 11:06:33 -0700 | |
changeset 23799 | daa645653200 |
parent 14260 | 727a84636f12 |
permissions | -rw-r--r-- |
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/* |
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* Copyright (c) 2000, 2012, Oracle and/or its affiliates. All rights reserved. |
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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* |
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* This code is free software; you can redistribute it and/or modify it |
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* under the terms of the GNU General Public License version 2 only, as |
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* published by the Free Software Foundation. Oracle designates this |
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* particular file as subject to the "Classpath" exception as provided |
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* by Oracle in the LICENSE file that accompanied this code. |
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* |
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* This code is distributed in the hope that it will be useful, but WITHOUT |
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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* version 2 for more details (a copy is included in the LICENSE file that |
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* accompanied this code). |
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* |
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* You should have received a copy of the GNU General Public License version |
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* 2 along with this work; if not, write to the Free Software Foundation, |
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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* |
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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* or visit www.oracle.com if you need additional information or have any |
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* questions. |
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*/ |
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package com.sun.tools.javadoc; |
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import static com.sun.tools.javac.code.Flags.*; |
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/** |
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* A class whose instances are filters over Modifier bits. |
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* Filtering is done by returning boolean values. |
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* Classes, methods and fields can be filtered, or filtering |
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* can be done directly on modifier bits. |
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* |
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* <p><b>This is NOT part of any supported API. |
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* If you write code that depends on this, you do so at your own risk. |
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* This code and its internal interfaces are subject to change or |
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* deletion without notice.</b> |
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* |
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* @see com.sun.tools.javac.code.Flags |
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* @author Robert Field |
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*/ |
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public class ModifierFilter { |
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/** |
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* Package private access. |
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* A "pseudo-" modifier bit that can be used in the |
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* constructors of this class to specify package private |
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* access. This is needed since there is no Modifier.PACKAGE. |
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*/ |
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public static final long PACKAGE = 0x8000000000000000L; |
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/** |
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* All access modifiers. |
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* A short-hand set of modifier bits that can be used in the |
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* constructors of this class to specify all access modifiers, |
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* Same as PRIVATE | PROTECTED | PUBLIC | PACKAGE. |
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*/ |
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public static final long ALL_ACCESS = |
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PRIVATE | PROTECTED | PUBLIC | PACKAGE; |
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private long oneOf; |
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private long must; |
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private long cannot; |
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private static final int ACCESS_BITS = PRIVATE | PROTECTED | PUBLIC; |
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/** |
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* Constructor - Specify a filter. |
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* |
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* @param oneOf If zero, everything passes the filter. |
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* If non-zero, at least one of the specified |
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* bits must be on in the modifier bits to |
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* pass the filter. |
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*/ |
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public ModifierFilter(long oneOf) { |
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this(oneOf, 0, 0); |
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} |
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/** |
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* Constructor - Specify a filter. |
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* For example, the filter below will only pass synchronized |
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* methods that are private or package private access and are |
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* not native or static. |
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* <pre> |
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* ModifierFilter( Modifier.PRIVATE | ModifierFilter.PACKAGE, |
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* Modifier.SYNCHRONIZED, |
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* Modifier.NATIVE | Modifier.STATIC) |
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* </pre><p> |
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* Each of the three arguments must either be |
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* zero or the or'ed combination of the bits specified in the |
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* class Modifier or this class. During filtering, these values |
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* are compared against the modifier bits as follows: |
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* |
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* @param oneOf If zero, ignore this argument. |
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* If non-zero, at least one of the bits must be on. |
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* @param must All bits specified must be on. |
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* @param cannot None of the bits specified can be on. |
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*/ |
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public ModifierFilter(long oneOf, long must, long cannot) { |
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this.oneOf = oneOf; |
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this.must = must; |
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this.cannot = cannot; |
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} |
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/** |
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* Filter on modifier bits. |
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* |
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* @param modifierBits Bits as specified in the Modifier class |
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* |
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* @return Whether the modifierBits pass this filter. |
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*/ |
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public boolean checkModifier(int modifierBits) { |
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// Add in the "pseudo-" modifier bit PACKAGE, if needed |
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long fmod = ((modifierBits & ACCESS_BITS) == 0) ? |
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modifierBits | PACKAGE : |
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modifierBits; |
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return ((oneOf == 0) || ((oneOf & fmod) != 0)) && |
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((must & fmod) == must) && |
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((cannot & fmod) == 0); |
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} |
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} // end ModifierFilter |