Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.diagram / src / org / simantics / diagram / symbolcontribution / AbstractSymbolProvider.java

diff --git a/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/AbstractSymbolProvider.java b/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/AbstractSymbolProvider.java
new file mode 100644 (file)
index 0000000..efe766a
--- /dev/null
+++ b/bundles/org.simantics.diagram/src/org/simantics/diagram/symbolcontribution/AbstractSymbolProvider.java
@@ -0,0 +1,77 @@
+/*******************************************************************************\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.diagram.symbolcontribution;\r
+\r
+import java.util.Collection;\r
+import java.util.Collections;\r
+import java.util.HashSet;\r
+import java.util.Set;\r
+\r
+import org.simantics.diagram.symbollibrary.ISymbolGroup;\r
+\r
+public abstract class AbstractSymbolProvider implements ISymbolProvider {\r
+    protected volatile boolean         disposed = false;\r
+    protected Runnable                 listener;\r
+    protected Collection<ISymbolGroup> groups   = Collections.emptyList();\r
+    private Set<ISymbolGroup>          groupSet = null;\r
+\r
+    public Collection<ISymbolGroup> getSymbolGroups() {\r
+        return groups;\r
+    }\r
+\r
+    public void setListener(Runnable listener) {\r
+        this.listener = listener;\r
+    }\r
+\r
+    public void dispose() {\r
+        disposed = true;\r
+    }\r
+\r
+    void setSymbolGroup(Collection<ISymbolGroup> groups) {\r
+        if (groups == null)\r
+            throw new NullPointerException("null groups");\r
+        this.groups = groups;\r
+    }\r
+\r
+    protected Set<ISymbolGroup> getSymbolGroupSet() {\r
+        synchronized (this) {\r
+            if (groupSet != null)\r
+                return groupSet;\r
+            groupSet = new HashSet<ISymbolGroup>(getSymbolGroups());\r
+            return groupSet;\r
+        }\r
+    }\r
+\r
+    void lockGroups() {\r
+        groups = Collections.unmodifiableCollection(groups);\r
+        groupSet = null;\r
+        getSymbolGroupSet();\r
+    }\r
+\r
+    @Override\r
+    public int hashCode() {\r
+        return getSymbolGroupSet().hashCode();\r
+    }\r
+\r
+    @Override\r
+    public boolean equals(Object obj) {\r
+        if (this == obj)\r
+            return true;\r
+        if (obj == null)\r
+            return false;\r
+        if (!(obj instanceof AbstractSymbolProvider))\r
+            return false;\r
+        AbstractSymbolProvider other = (AbstractSymbolProvider) obj;\r
+        return getSymbolGroupSet().equals( other.getSymbolGroupSet() );\r
+    }\r
+\r
+}\r