Migrated source code from Simantics SVN

[simantics/platform.git] / bundles / org.simantics.layer0.utils / src / org / simantics / layer0 / utils / predicates / Conjunction.java

diff --git a/bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/predicates/Conjunction.java b/bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/predicates/Conjunction.java
new file mode 100644 (file)
index 0000000..034ecbf
--- /dev/null
+++ b/bundles/org.simantics.layer0.utils/src/org/simantics/layer0/utils/predicates/Conjunction.java
@@ -0,0 +1,117 @@
+/*******************************************************************************\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.layer0.utils.predicates;\r
+\r
+import java.util.ArrayList;\r
+import java.util.Arrays;\r
+import java.util.Collection;\r
+\r
+import org.simantics.db.Resource;\r
+import org.simantics.db.ReadGraph;\r
+import org.simantics.db.WriteGraph;\r
+import org.simantics.db.exception.DatabaseException;\r
+\r
+public class Conjunction extends UnaryPredicate {\r
+\r
+       Collection<IUnaryPredicate> predicates;\r
+       IUnaryPredicate support;\r
+\r
+       public Conjunction(Collection<IUnaryPredicate> predicates) {\r
+               for(IUnaryPredicate pred : predicates)\r
+                       if(pred.supportsUnboundedQuery()) {\r
+                               this.support = pred;\r
+                               this.predicates = new ArrayList<IUnaryPredicate>(predicates.size()-1);\r
+                               for(IUnaryPredicate pred2 : predicates)\r
+                                       if(pred != pred2)\r
+                                               this.predicates.add(pred2);\r
+                               return;\r
+                       }\r
+               this.predicates = predicates;\r
+               this.support = null;\r
+       }\r
+       \r
+       public Conjunction(IUnaryPredicate ... predicates) {\r
+        this(Arrays.asList(predicates));\r
+    }\r
+\r
+       @Override\r
+       public Collection<Resource> getResources(ReadGraph g) throws DatabaseException {\r
+               Collection<Resource> result = new ArrayList<Resource>();\r
+               ll:     for(Resource r : support.getResources(g)) {                     \r
+                       for(IUnaryPredicate pred : predicates)\r
+                               if(!pred.has(g, r))\r
+                                       continue ll;\r
+                       result.add(r);\r
+               }\r
+               return result;\r
+       }\r
+\r
+       @Override\r
+       public boolean has(ReadGraph g, Resource resource) throws DatabaseException {\r
+               for(IUnaryPredicate pred : predicates)\r
+                       if(!pred.has(g, resource))\r
+                               return false;\r
+               return support == null || support.has(g, resource);\r
+       }\r
+\r
+       @Override\r
+       public boolean supportsUnboundedQuery() {               \r
+               return support != null;\r
+       }       \r
+       \r
+       @Override\r
+       public void add(WriteGraph g, Resource r) {\r
+               throw new UnsupportedOperationException();\r
+       }\r
+\r
+       @Override\r
+       public void remove(WriteGraph g, Resource r) {\r
+               throw new UnsupportedOperationException();\r
+       }\r
+\r
+       @Override\r
+       public boolean supportsAddition() {\r
+               return false;\r
+       }\r
+\r
+       @Override\r
+       public boolean supportsRemoval() {              \r
+               return false;\r
+       }\r
+\r
+       @Override\r
+       public int hashCode() {\r
+               final int prime = 31;\r
+               int result = 1;\r
+               result = prime * result\r
+                               + ((predicates == null) ? 0 : predicates.hashCode());\r
+               return result;\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 (getClass() != obj.getClass())\r
+                       return false;\r
+               Conjunction other = (Conjunction) obj;\r
+               if (predicates == null) {\r
+                       if (other.predicates != null)\r
+                               return false;\r
+               } else if (!predicates.equals(other.predicates))\r
+                       return false;\r
+               return true;\r
+       }\r
+               \r
+}\r