001package votorola.g.lang; // Copyright 2003-2005, 2012, Michael Allan. Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Votorola Software"), to deal in the Votorola Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicence, and/or sell copies of the Votorola Software, and to permit persons to whom the Votorola Software is furnished to do so, subject to the following conditions: The preceding copyright notice and this permission notice shall be included in all copies or substantial portions of the Votorola Software. THE VOTOROLA SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE VOTOROLA SOFTWARE OR THE USE OR OTHER DEALINGS IN THE VOTOROLA SOFTWARE. 002 003 004/** Object utilities. 005 */ 006public final class ObjectX 007{ 008 009 private ObjectX() {} 010 011 012 013 /** An equator that uses the {@linkplain Object#equals(Object) #equals}() method of 014 * the first object, if it is not null. Its thread safety is that of 015 * <code>o1.equals(object)</code>. 016 */ 017 public static final Equator<Object> EQUATOR = new Equator<Object>() 018 { 019 // changing? change also in g/web/gwt/super/ 020 public boolean equals( final Object o1, final Object o2 ) 021 { 022 if( o1 == null ) return o2 == null; 023 024 return o1.equals( o2 ); 025 } 026 }; 027 028 029 030 // /** Returns null if o is null; o.clone() otherwise. 031 // */ 032 // public static Object nullClone( Object o ) 033 // { 034 // if( o == null ) return o; 035 // else return o.clone(); 036 // } 037 //////// sorry, clone() is protected 038 039 040 041 /** Returns true iff the objects are either 'equal', or both null. This does the same 042 * thing as {@linkplain #EQUATOR EQUATOR} and will eventually be deprecated. The 043 * thread safety is that of <code>o1.equals(object)</code>. 044 */ 045 public static boolean nullEquals( final Object o1, final Object o2 ) 046 { 047 // changing? change also in g/web/gwt/super/ 048 if( o1 == null ) return o2 == null; 049 050 return o1.equals( o2 ); 051 } 052 053 054 055 // /** Returns o.toString() if o is non-null; null otherwise. 056 // */ 057 // public static String nullToString( Object o ) 058 // { 059 // if( o == null ) return null; 060 // 061 // return o.toString(); 062 // } 063 //////// this sort of thing would have to be done everywhere 064 065 066 067 /** Same as object.wait(), but returns normally if interrupted. 068 * 069 * @return true if the wait ended normally; false if an InterruptedException occured 070 */ 071 public static @ThreadSafe boolean tryWait( final Object object ) 072 { 073 try 074 { 075 object.wait(); 076 return true; 077 } 078 catch( InterruptedException x ) { return false; } 079 } 080 081 082 083 /** Same as object.wait(milliseconds), but returns normally if interrupted. 084 * 085 * @return true if the wait ended normally; false if an InterruptedException occured 086 */ 087 public static @ThreadSafe boolean tryWait( final Object object, final long timeout ) 088 { 089 try 090 { 091 object.wait( timeout ); 092 return true; 093 } 094 catch( InterruptedException x ) { return false; } 095 } 096 097 098 099}