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Diffstat (limited to 'framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/WeakishReference.java')
-rw-r--r-- | framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/WeakishReference.java | 91 |
1 files changed, 91 insertions, 0 deletions
diff --git a/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/WeakishReference.java b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/WeakishReference.java new file mode 100644 index 00000000..92f322fb --- /dev/null +++ b/framework/src/ant/apache-ant-1.9.6/src/main/org/apache/tools/ant/util/WeakishReference.java @@ -0,0 +1,91 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (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.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + */ + +package org.apache.tools.ant.util; + + +import java.lang.ref.WeakReference; + +/** + * These classes are part of some code to reduce memory leaks by only + * retaining weak references to things + * on Java1.2+, and yet still work (with leaky hard references) on Java1.1. + * Now that Ant is 1.2+ only, + * life is simpler and none of the classes are needed any more. + * + * They are only retained in case a third-party task uses them + * @since ant1.6 + * @see org.apache.tools.ant.util.optional.WeakishReference12 + * @deprecated deprecated 1.7; will be removed in Ant1.8 + * Just use {@link java.lang.ref.WeakReference} directly. + */ +public class WeakishReference { + + + private WeakReference weakref; + + /** + * create a new soft reference, which is bound to a + * Weak reference inside + * + * @param reference + * @see java.lang.ref.WeakReference + */ + WeakishReference(Object reference) { + this.weakref = new WeakReference(reference); + } + + /** + * Returns this reference object's referent. If this reference object has + * been cleared, then this method returns <code>null</code>. + * + * @return The object to which this reference refers, or + * <code>null</code> if this reference object has been cleared. + */ + public Object get() { + return weakref.get(); + } + + /** + * create the appropriate type of reference for the java version + * @param object the object that the reference will refer to. + * @return reference to the Object. + */ + public static WeakishReference createReference(Object object) { + return new WeakishReference(object); + } + + + /** + * This was a hard reference for Java 1.1. Since Ant1.7, + * @deprecated since 1.7. + * Hopefully nobody is using this. + */ + public static class HardReference extends WeakishReference { + + /** + * constructor. + * @param object the object that the reference will refer to. + */ + public HardReference(Object object) { + super(object); + } + + } + +} |