Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.utils.datastructures / src / org / simantics / utils / datastructures / EssentiallyIterableCollection.java

diff --git a/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/EssentiallyIterableCollection.java b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/EssentiallyIterableCollection.java
new file mode 100644 (file)
index 0000000..af92cb0
--- /dev/null
+++ b/bundles/org.simantics.utils.datastructures/src/org/simantics/utils/datastructures/EssentiallyIterableCollection.java
@@ -0,0 +1,57 @@
+/*******************************************************************************\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;\r
+\r
+import java.util.Collection;\r
+import java.util.Iterator;\r
+\r
+\r
+/**\r
+ * Immutable Collection adapter that uses iterator method to implement all \r
+ * its methods. \r
+ */\r
+public abstract class EssentiallyIterableCollection<E> extends ImmutableCollection<E> {\r
+\r
+    @Override\r
+    public boolean contains(Object o) {\r
+        Iterator<E> iterator = iterator();\r
+        while(iterator.hasNext()) \r
+            if(iterator.next().equals(o))\r
+                return true;\r
+        return false;\r
+    }\r
+\r
+    @Override\r
+    public boolean containsAll(Collection<?> c) {\r
+        for(Object o : c)\r
+            if(!contains(o))\r
+                return false;\r
+        return true;\r
+    }\r
+\r
+    @Override\r
+    public boolean isEmpty() {\r
+        return iterator().hasNext();\r
+    }\r
+\r
+    @Override\r
+    public int size() {\r
+        int count = 0;\r
+        Iterator<E> iterator = iterator();\r
+        while(iterator.hasNext()) {\r
+            ++ count;\r
+            iterator.next();\r
+        }\r
+        return count;\r
+    }\r
+\r
+}\r