Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.db.impl / src / org / simantics / db / impl / graph / InternalStatement.java

diff --git a/bundles/org.simantics.db.impl/src/org/simantics/db/impl/graph/InternalStatement.java b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/graph/InternalStatement.java
new file mode 100644 (file)
index 0000000..264ea1e
--- /dev/null
+++ b/bundles/org.simantics.db.impl/src/org/simantics/db/impl/graph/InternalStatement.java
@@ -0,0 +1,88 @@
+/*******************************************************************************\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.graph;\r
+\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.Statement;\r
+import org.simantics.db.impl.ResourceImpl;\r
+import org.simantics.db.impl.support.ResourceSupport;\r
+\r
+public final class InternalStatement implements Statement, Comparable<Statement> {\r
+       \r
+       final ResourceSupport support;\r
+    final int s;\r
+    final int p;\r
+    final int o;\r
+    \r
+    public InternalStatement(ResourceSupport support, final int s, final int p, final int o) {\r
+       this.support = support;\r
+        this.s = s;\r
+        this.p = p;\r
+        this.o = o;\r
+    }\r
+    \r
+       @Override\r
+       public Resource getSubject() {\r
+               return new ResourceImpl(support, s);\r
+       }\r
+\r
+       @Override\r
+       public Resource getPredicate() {\r
+               return new ResourceImpl(support, p);\r
+       }\r
+\r
+       @Override\r
+       public Resource getObject() {\r
+               return new ResourceImpl(support, o);\r
+       }\r
+\r
+       @Override\r
+       public boolean isAsserted(Resource subject) {\r
+               return ((ResourceImpl)subject).id != s;\r
+       }\r
+    \r
+    @Override\r
+    final public int hashCode() {\r
+        return 41 * ( 31 * s + p) + o;\r
+    }\r
+\r
+    final private int id(Resource r) {\r
+       return ((ResourceImpl)r).id;\r
+    }\r
+    \r
+    @Override\r
+    public boolean equals(Object object) {\r
+        if (this == object)\r
+            return true;\r
+        else if (object == null)\r
+            return false;\r
+        else if (!(object instanceof Statement))\r
+            return false;\r
+        Statement r = (Statement)object;\r
+        return s == id(r.getSubject()) && p == id(r.getPredicate()) && o== id(r.getObject());\r
+    }\r
+    \r
+    @Override\r
+    public int compareTo(Statement other) {\r
+        int result = compare(s,id(other.getSubject()));\r
+        if(result != 0) return result;\r
+        result = compare(p,id(other.getPredicate()));\r
+        if(result != 0) return result;\r
+        return compare(o,id(other.getObject()));\r
+    }\r
+\r
+    private int compare(int x, int y) {\r
+        return (x < y) ? -1 : ((x == y) ? 0 : 1);\r
+    }\r
+\r
+}\r
+\r