-/*******************************************************************************\r
- * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
- * in Industry THTH ry.\r
- * All rights reserved. This program and the accompanying materials\r
- * are made available under the terms of the Eclipse Public License v1.0\r
- * which accompanies this distribution, and is available at\r
- * http://www.eclipse.org/legal/epl-v10.html\r
- *\r
- * Contributors:\r
- * VTT Technical Research Centre of Finland - initial API and implementation\r
- *******************************************************************************/\r
-package org.simantics.utils.datastructures.cache;\r
-\r
-import java.lang.ref.WeakReference;\r
-\r
-/**\r
- * Caches the value provided by provider until the value has been garbage collected.\r
- * <p>\r
- * Cached IProvider provides the same instance as long as it is in memory.\r
- * <p>\r
- * Cached version is equal to original in hashCode/equals wise.\r
- * \r
- * @author Toni Kalajainen\r
- */\r
-public class WeakCachedProvider<V> implements IProvider<V> {\r
-\r
- public static final <V> IProvider<V> cache(IProvider<V> provider)\r
- {\r
- if (provider instanceof WeakCachedProvider<?>)\r
- return provider;\r
- return new WeakCachedProvider<V>(provider);\r
- }\r
-\r
- IProvider<V> provider;\r
- WeakReference<V> ref;\r
-\r
- WeakCachedProvider(IProvider<V> orig)\r
- {\r
- this.provider = orig;\r
- }\r
-\r
- @Override\r
- public synchronized V get() throws ProvisionException {\r
- if (ref!=null) {\r
- V x = ref.get();\r
- if (x==null) ref=null;\r
- else return x;\r
- }\r
- V x = provider.get();\r
- ref = new WeakReference<V>(x);\r
- return x;\r
- }\r
-\r
- @Override\r
- public int hashCode() {\r
- return provider.hashCode();\r
- }\r
-\r
- @Override\r
- public boolean equals(Object obj) {\r
- return provider.equals(obj);\r
- }\r
-\r
-}\r
+/*******************************************************************************
+ * Copyright (c) 2007, 2010 Association for Decentralized Information Management
+ * in Industry THTH ry.
+ * 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:
+ * VTT Technical Research Centre of Finland - initial API and implementation
+ *******************************************************************************/
+package org.simantics.utils.datastructures.cache;
+
+import java.lang.ref.WeakReference;
+
+/**
+ * Caches the value provided by provider until the value has been garbage collected.
+ * <p>
+ * Cached IProvider provides the same instance as long as it is in memory.
+ * <p>
+ * Cached version is equal to original in hashCode/equals wise.
+ *
+ * @author Toni Kalajainen
+ */
+public class WeakCachedProvider<V> implements IProvider<V> {
+
+ public static final <V> IProvider<V> cache(IProvider<V> provider)
+ {
+ if (provider instanceof WeakCachedProvider<?>)
+ return provider;
+ return new WeakCachedProvider<V>(provider);
+ }
+
+ IProvider<V> provider;
+ WeakReference<V> ref;
+
+ WeakCachedProvider(IProvider<V> orig)
+ {
+ this.provider = orig;
+ }
+
+ @Override
+ public synchronized V get() throws ProvisionException {
+ if (ref!=null) {
+ V x = ref.get();
+ if (x==null) ref=null;
+ else return x;
+ }
+ V x = provider.get();
+ ref = new WeakReference<V>(x);
+ return x;
+ }
+
+ @Override
+ public int hashCode() {
+ return provider.hashCode();
+ }
+
+ @Override
+ public boolean equals(Object obj) {
+ return provider.equals(obj);
+ }
+
+}