diff options
Diffstat (limited to 'common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/Filter.java')
-rw-r--r-- | common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/Filter.java | 125 |
1 files changed, 0 insertions, 125 deletions
diff --git a/common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/Filter.java b/common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/Filter.java deleted file mode 100644 index 222185940e..0000000000 --- a/common/plugins/org.eclipse.jpt.common.utility/src/org/eclipse/jpt/common/utility/Filter.java +++ /dev/null @@ -1,125 +0,0 @@ -/******************************************************************************* - * Copyright (c) 2005, 2010 Oracle. All rights reserved. - * This program and the accompanying materials are made available under the - * terms of the Eclipse Public License v1.0, which accompanies this distribution - * and is available at http://www.eclipse.org/legal/epl-v10.html. - * - * Contributors: - * Oracle - initial API and implementation - ******************************************************************************/ -package org.eclipse.jpt.common.utility; - -import java.io.Serializable; - -/** - * Used by various "pluggable" classes to filter objects. - * <p> - * Provisional API: This interface is part of an interim API that is still - * under development and expected to change significantly before reaching - * stability. It is available at this early stage to solicit feedback from - * pioneering adopters on the understanding that any code that uses this API - * will almost certainly be broken (repeatedly) as the API evolves. - * - * @param <T> the type of objects to be filtered - */ -public interface Filter<T> { - - /** - * Return whether the specified object is "accepted" by the - * filter. The semantics of "accept" is determined by the - * contract between the client and the server. - */ - boolean accept(T o); - - - /** - * Singleton implemetation of the filter interface that accepts all the - * objects (i.e. it does no filtering). - */ - final class Null<S> implements Filter<S>, Serializable { - @SuppressWarnings("rawtypes") - public static final Filter INSTANCE = new Null(); - @SuppressWarnings("unchecked") - public static <R> Filter<R> instance() { - return INSTANCE; - } - // ensure single instance - private Null() { - super(); - } - // nothing is filtered - everything is accepted - public boolean accept(S o) { - return true; - } - @Override - public String toString() { - return "Filter.Null"; //$NON-NLS-1$ - } - private static final long serialVersionUID = 1L; - private Object readResolve() { - // replace this object with the singleton - return INSTANCE; - } - } - - /** - * Singleton implemetation of the filter interface that accepts none of the - * objects (i.e. it filters out all the objects). - */ - final class Opaque<S> implements Filter<S>, Serializable { - @SuppressWarnings("rawtypes") - public static final Filter INSTANCE = new Opaque(); - @SuppressWarnings("unchecked") - public static <R> Filter<R> instance() { - return INSTANCE; - } - // ensure single instance - private Opaque() { - super(); - } - // everything is filtered - nothing is accepted - public boolean accept(S o) { - return false; - } - @Override - public String toString() { - return "Filter.Opaque"; //$NON-NLS-1$ - } - private static final long serialVersionUID = 1L; - private Object readResolve() { - // replace this object with the singleton - return INSTANCE; - } - } - - /** - * Singleton implemetation of the filter interface that throws an exception - * if called. - */ - final class Disabled<S> implements Filter<S>, Serializable { - @SuppressWarnings("rawtypes") - public static final Filter INSTANCE = new Disabled(); - @SuppressWarnings("unchecked") - public static <R> Filter<R> instance() { - return INSTANCE; - } - // ensure single instance - private Disabled() { - super(); - } - // throw an exception - public boolean accept(S o) { - throw new UnsupportedOperationException(); - } - @Override - public String toString() { - return "Filter.Disabled"; //$NON-NLS-1$ - } - private static final long serialVersionUID = 1L; - private Object readResolve() { - // replace this object with the singleton - return INSTANCE; - } - } - -} |