Migrated source code from Simantics SVN

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

diff --git a/bundles/org.simantics.utils/src/org/simantics/utils/DataContainer.java b/bundles/org.simantics.utils/src/org/simantics/utils/DataContainer.java
new file mode 100644 (file)
index 0000000..89b5763
--- /dev/null
+++ b/bundles/org.simantics.utils/src/org/simantics/utils/DataContainer.java
@@ -0,0 +1,149 @@
+/*******************************************************************************\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
+/*\r
+ * Created on 16.12.2005\r
+ * \r
+ */\r
+package org.simantics.utils;\r
+\r
+import java.lang.reflect.Array;\r
+import java.util.Collection;\r
+import java.util.Iterator;\r
+\r
+\r
+/**\r
+ * DataContainer is used as return argument\r
+ * \r
+ * @author Toni Kalajainen\r
+ */\r
+public final class DataContainer<T> implements Container<T>, Collection<T> {\r
+\r
+    private T data;\r
+\r
+    public static <T> DataContainer<T> make(T t) {\r
+        return new DataContainer<T>(t);\r
+    }\r
+\r
+    public DataContainer() {\r
+    }\r
+\r
+    public DataContainer(T initialData) {\r
+        this.data = initialData;\r
+    }\r
+\r
+    public boolean isEmpty() {\r
+        return data == null;\r
+    }\r
+\r
+    public void set(T value) {\r
+        data = value;\r
+    }\r
+\r
+    public T get() {\r
+        return data;\r
+    }\r
+\r
+    public boolean hasContent() {\r
+        return data != null;\r
+    }\r
+\r
+    @Override\r
+    public boolean add(T arg0) {\r
+        throw new UnsupportedOperationException();\r
+    }\r
+\r
+    @Override\r
+    public boolean addAll(Collection<? extends T> arg0) {\r
+        throw new UnsupportedOperationException();\r
+    }\r
+\r
+    @Override\r
+    public void clear() {\r
+        throw new UnsupportedOperationException();\r
+    }\r
+\r
+    @Override\r
+    public boolean contains(Object arg0) {\r
+        throw new UnsupportedOperationException();\r
+    }\r
+\r
+    @Override\r
+    public boolean containsAll(Collection<?> arg0) {\r
+        throw new UnsupportedOperationException();\r
+    }\r
+\r
+    @Override\r
+    public Iterator<T> iterator() {\r
+\r
+        return new Iterator<T>() {\r
+\r
+            private T value = data;\r
+\r
+            @Override\r
+            public boolean hasNext() {\r
+                return value != null;\r
+            }\r
+\r
+            @Override\r
+            public T next() {\r
+                T result = value;\r
+                value = null;\r
+                return result;\r
+            }\r
+\r
+            @Override\r
+            public void remove() {\r
+                throw new UnsupportedOperationException();\r
+            }\r
+        };\r
+\r
+    }\r
+\r
+    @Override\r
+    public boolean remove(Object arg0) {\r
+        throw new UnsupportedOperationException();\r
+    }\r
+\r
+    @Override\r
+    public boolean removeAll(Collection<?> arg0) {\r
+        throw new UnsupportedOperationException();\r
+    }\r
+\r
+    @Override\r
+    public boolean retainAll(Collection<?> arg0) {\r
+        throw new UnsupportedOperationException();\r
+    }\r
+\r
+    @Override\r
+    public int size() {\r
+        return data != null ? 1 : 0;\r
+    }\r
+\r
+    @Override\r
+    public Object[] toArray() {\r
+        return new Object[] { data };\r
+    }\r
+\r
+    @SuppressWarnings("unchecked")\r
+    @Override\r
+    public <K> K[] toArray(K[] a) {\r
+        int size = size();\r
+        if (a.length < size)\r
+            a = (K[]) Array.newInstance(a.getClass().getComponentType(), 1);\r
+        if (size > 0)\r
+            a[0] = (K) data;\r
+        for (int i = size; i < a.length; ++i)\r
+            a[i] = null;\r
+        return a;\r
+    }\r
+\r
+}\r