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Diffstat (limited to 'engine/src/networking/com/jme3/network/Filters.java')
-rw-r--r-- | engine/src/networking/com/jme3/network/Filters.java | 159 |
1 files changed, 159 insertions, 0 deletions
diff --git a/engine/src/networking/com/jme3/network/Filters.java b/engine/src/networking/com/jme3/network/Filters.java new file mode 100644 index 0000000..c255201 --- /dev/null +++ b/engine/src/networking/com/jme3/network/Filters.java @@ -0,0 +1,159 @@ +/* + * Copyright (c) 2011 jMonkeyEngine + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions are + * met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * * Neither the name of 'jMonkeyEngine' nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED + * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +package com.jme3.network; + +import java.util.Arrays; +import java.util.Collection; +import java.util.HashSet; + +/** + * Static utility methods pertaining to Filter instances. + * + * @version $Revision: 8843 $ + * @author Paul Speed + */ +public class Filters +{ + /** + * Creates a filter that returns true for any value in the specified + * list of values and false for all other cases. + */ + public static <T> Filter<T> in( T... values ) + { + return in( new HashSet<T>(Arrays.asList(values)) ); + } + + /** + * Creates a filter that returns true for any value in the specified + * collection and false for all other cases. + */ + public static <T> Filter<T> in( Collection<? extends T> collection ) + { + return new InFilter<T>(collection); + } + + /** + * Creates a filter that returns true for any value NOT in the specified + * list of values and false for all other cases. This is the equivalent + * of calling not(in(values)). + */ + public static <T> Filter<T> notIn( T... values ) + { + return not( in( values ) ); + } + + /** + * Creates a filter that returns true for any value NOT in the specified + * collection and false for all other cases. This is the equivalent + * of calling not(in(collection)). + */ + public static <T> Filter<T> notIn( Collection<? extends T> collection ) + { + return not( in( collection ) ); + } + + /** + * Creates a filter that returns true for inputs that are .equals() + * equivalent to the specified value. + */ + public static <T> Filter<T> equalTo( T value ) + { + return new EqualToFilter<T>(value); + } + + /** + * Creates a filter that returns true for inputs that are NOT .equals() + * equivalent to the specified value. This is the equivalent of calling + * not(equalTo(value)). + */ + public static <T> Filter<T> notEqualTo( T value ) + { + return not(equalTo(value)); + } + + /** + * Creates a filter that returns true when the specified delegate filter + * returns false, and vice versa. + */ + public static <T> Filter<T> not( Filter<T> f ) + { + return new NotFilter<T>(f); + } + + private static class EqualToFilter<T> implements Filter<T> + { + private T value; + + public EqualToFilter( T value ) + { + this.value = value; + } + + public boolean apply( T input ) + { + return value == input || (value != null && value.equals(input)); + } + } + + private static class InFilter<T> implements Filter<T> + { + private Collection<? extends T> collection; + + public InFilter( Collection<? extends T> collection ) + { + this.collection = collection; + } + + public boolean apply( T input ) + { + return collection.contains(input); + } + } + + private static class NotFilter<T> implements Filter<T> + { + private Filter<T> delegate; + + public NotFilter( Filter<T> delegate ) + { + this.delegate = delegate; + } + + public boolean apply( T input ) + { + return !delegate.apply(input); + } + } +} + + |