Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.db.impl / src / org / simantics / db / impl / query / ListenerEntry.java

diff --git a/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/ListenerEntry.java b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/ListenerEntry.java
new file mode 100644 (file)
index 0000000..3162129
--- /dev/null
+++ b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/query/ListenerEntry.java
@@ -0,0 +1,76 @@
+/*******************************************************************************\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.db.impl.query;\r
+\r
+import org.simantics.db.procedure.ListenerBase;\r
+\r
+class ListenerEntry {\r
+    \r
+    public static final Object NO_VALUE = new Object() {\r
+        \r
+        public String toString() { return "NO_VALUE"; };\r
+        \r
+    };\r
+    public static final Object NOT_CHANGED = new Object() {\r
+      \r
+        public String toString() { return "NOT_CHANGED"; };\r
+        \r
+    };\r
+    \r
+    public ListenerBase base;\r
+    public Object procedure;\r
+    public CacheEntry entry;\r
+    \r
+    private Object lastKnownResult;\r
+    \r
+    public ListenerEntry(CacheEntry entry, ListenerBase base, Object procedure) {\r
+        this.entry = entry;\r
+        this.base = base;\r
+        this.procedure = procedure;\r
+        if(entry.isReady()) {\r
+            this.lastKnownResult = entry.getResult();\r
+        } else {\r
+            this.lastKnownResult = NO_VALUE;\r
+        }\r
+    }\r
+    \r
+    public void setLastKnown(Object object) {\r
+       lastKnownResult = object;\r
+    }\r
+    \r
+    public Object getLastKnown() {\r
+       return lastKnownResult;\r
+    }\r
+\r
+    @Override\r
+    public String toString() {\r
+//     return "[ListenerEntry last = " + lastKnownResult + ", procedure = " + procedure + "]";\r
+       return "[ListenerEntry " + ", procedure = " + procedure + " base=" + base + "]";\r
+    }\r
+    \r
+    @Override\r
+    public int hashCode() {\r
+        return base.hashCode();\r
+    }\r
+    \r
+       @Override\r
+    public boolean equals(Object obj) {\r
+\r
+        if(obj == this) return true;\r
+        if(obj == null) return false;\r
+        if(obj.getClass() != this.getClass()) return false;\r
+        ListenerEntry other = (ListenerEntry)obj;\r
+        return base.equals(other.base);\r
+        \r
+    }\r
+    \r
+}\r