+/**
+ *
+ */
+package eu.etaxonomy.taxeditor.editor.view.derivate;
+
+import java.util.Arrays;
+
+import org.eclipse.core.expressions.PropertyTester;
+import org.eclipse.jface.viewers.IStructuredSelection;
+
+import eu.etaxonomy.cdm.model.occurrence.DerivedUnit;
+import eu.etaxonomy.cdm.model.occurrence.FieldUnit;
+
+/**
+ * Property tester used by the DerivateView tree menu.
+ *
+ */
+public class DerivateMenuPropertyTester extends PropertyTester {
+
+ private static final String IS_FIELD_UNIT = "isFieldUnit";
+ private static final String IS_SPECIMEN = "isSpecimen";
+
+ /* (non-Javadoc)
+ * @see org.eclipse.core.expressions.IPropertyTester#test(java.lang.Object, java.lang.String, java.lang.Object[], java.lang.Object)
+ */
+ /** {@inheritDoc} */
+ @Override
+ public boolean test(Object receiver, String property, Object[] args, Object expectedValue) {
+ System.out.println(receiver.toString() + receiver.getClass().toString());
+ System.out.println(property);
+ System.out.println(Arrays.asList(args));
+ System.out.println(expectedValue);
+
+ Object[] selectedElements = ((IStructuredSelection) receiver).toArray();
+
+ if(selectedElements.length == 0){
+ // nothing selected so all tests should fail
+ return false;
+ }
+
+ if(IS_FIELD_UNIT.equals(property)){
+ return isFieldUnit(selectedElements);
+ }
+ else if(IS_SPECIMEN.equals(property)){
+ return isSpecimen(selectedElements);
+ }
+ else{
+ return false;
+ }
+ }
+
+ private boolean isFieldUnit(Object[] selectedElements) {
+ for (Object object : selectedElements){
+ if(!(object instanceof FieldUnit)){
+ return false;
+ }
+ }
+ return true;
+ }
+
+ private boolean isSpecimen(Object[] selectedElements) {
+ for (Object object : selectedElements){
+ if(!(object instanceof DerivedUnit)){
+ return false;
+ }
+ }
+ return true;
+ }
+}