X-Git-Url: https://gerrit.simantics.org/r/gitweb?a=blobdiff_plain;f=bundles%2Forg.simantics.db.common%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fcommon%2Frequest%2FAdapt.java;fp=bundles%2Forg.simantics.db.common%2Fsrc%2Forg%2Fsimantics%2Fdb%2Fcommon%2Frequest%2FAdapt.java;h=3ca5a7362052b9a685d6968c93073c2af71ffe32;hb=969bd23cab98a79ca9101af33334000879fb60c5;hp=0000000000000000000000000000000000000000;hpb=866dba5cd5a3929bbeae85991796acb212338a08;p=simantics%2Fplatform.git

diff --git a/bundles/org.simantics.db.common/src/org/simantics/db/common/request/Adapt.java b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/Adapt.java
new file mode 100644
index 000000000..3ca5a7362
--- /dev/null
+++ b/bundles/org.simantics.db.common/src/org/simantics/db/common/request/Adapt.java
@@ -0,0 +1,78 @@
+package org.simantics.db.common.request;
+
+import org.simantics.db.ReadGraph;
+import org.simantics.db.Resource;
+import org.simantics.db.exception.AdaptionException;
+import org.simantics.db.exception.ServiceException;
+import org.simantics.db.exception.ValidationException;
+
+/**
+ * @author Tuukka Lehtonen
+ * 
+ * @param <T> the adaption target interface
+ */
+public class Adapt<T> extends ResourceRead<T> {
+
+    final protected Class<T> target;
+    final protected boolean  allowNull;
+    final protected boolean  uniqueResult;
+
+    public Adapt(Resource resource, Class<T> target) {
+        this(resource, target, false, false);
+    }
+
+    public Adapt(Resource resource, Class<T> target, boolean allowNull) {
+        this(resource, target, allowNull, false);
+    }
+
+    public Adapt(Resource resource, Class<T> target, boolean allowNull, boolean uniqueResult) {
+        super(resource);
+        assert target != null;
+        this.target = target;
+        this.allowNull = allowNull;
+        this.uniqueResult = uniqueResult;
+    }
+
+    @Override
+    public T perform(ReadGraph graph) throws AdaptionException, ValidationException, ServiceException {
+        if (allowNull) {
+            if (uniqueResult)
+                return graph.getPossibleUniqueAdapter(resource, target);
+            return graph.getPossibleAdapter(resource, target);
+        }
+        if (uniqueResult)
+            return graph.adaptUnique(resource, target);
+        return graph.adapt(resource, target);
+    }
+
+    @Override
+    public int hashCode() {
+        final int prime = 31;
+        int result = super.hashCode();
+        result = prime * result + (allowNull ? 1231 : 1237);
+        result = prime * result + (target.hashCode());
+        result = prime * result + (uniqueResult ? 1303 : 1319);
+        return result;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (obj == null)
+            return false;
+        if (this == obj)
+            return true;
+        if (getClass() != obj.getClass())
+            return false;
+        Adapt<?> other = (Adapt<?>) obj;
+        if (!resource.equals(other.resource))
+            return false;
+        if (allowNull != other.allowNull)
+            return false;
+        if (!target.equals(other.target))
+            return false;
+        if (uniqueResult != other.uniqueResult)
+            return false;
+        return true;
+    }
+
+}
\ No newline at end of file