added semanticpropertyutilities

stratosphere-java/src/main/java/eu/stratosphere/api/java/functions/SemanticPropUtil.java

+package eu.stratosphere.api.java.functions;
+
+import java.lang.annotation.Annotation;
+import java.util.Iterator;
+import java.util.Set;
+
+import eu.stratosphere.api.common.operators.DualInputSemanticProperties;
+import eu.stratosphere.api.common.operators.SingleInputSemanticProperties;
+import eu.stratosphere.api.java.functions.FunctionAnnotation.ConstantFields;
+import eu.stratosphere.api.java.functions.FunctionAnnotation.ConstantFieldsExcept;
+import eu.stratosphere.api.java.functions.FunctionAnnotation.ReadFields;
+import eu.stratosphere.api.java.typeutils.TypeInformation;
+
+public class SemanticPropUtil {
+	public SingleInputSemanticProperties getSemanticPropsSingle(Set<Annotation> set, TypeInformation<?> inType, TypeInformation<?> outType) {
+		Iterator<Annotation> it = set.iterator();
+		SingleInputSemanticProperties result = null;
+		
+		while (it.hasNext()) {
+			if (result == null) {
+				result = new SingleInputSemanticProperties();
+			}
+			
+			Annotation ann = it.next();
+			
+			if (ann instanceof ConstantFields) {
+				ConstantFields cf = (ConstantFields) ann;
+			} else if (ann instanceof ConstantFieldsExcept) {
+				ConstantFieldsExcept cfe = (ConstantFieldsExcept) ann;
+			} else if (ann instanceof ReadFields) {
+				ReadFields rf = (ReadFields) ann;
+			}
+		}
+		return null;
+	}
+	
+	private void parseConstantFields(ConstantFields cf, SingleInputSemanticProperties sm) {
+		
+	}
+	
+	private void parseConstantFieldsExcept(ConstantFieldsExcept cfe, SingleInputSemanticProperties sm) {
+		
+	}
+	
+	private void parseReadFields(ReadFields rf, SingleInputSemanticProperties sm) {
+	
+	}
+	
+	public DualInputSemanticProperties getSemanticPropsDua(Set<Annotation> set, TypeInformation<?> inType1, TypeInformation<?> inType2, TypeInformation<?> outType) {
+		return null;
+	}
+}