X-Git-Url: https://git.argeo.org/?p=gpl%2Fargeo-suite.git;a=blobdiff_plain;f=org.argeo.suite.core%2Fsrc%2Forg%2Fargeo%2Fsuite%2FRankedObject.java;fp=org.argeo.suite.core%2Fsrc%2Forg%2Fargeo%2Fsuite%2FRankedObject.java;h=bfba46e449879f6cfa717daafc70d4d815c064a2;hp=0000000000000000000000000000000000000000;hb=3440f51df3e4c015972c7b6a0efb3ce16188b89b;hpb=752a7b2614895002a3d184be166ef4162caf0d05

diff --git a/org.argeo.suite.core/src/org/argeo/suite/RankedObject.java b/org.argeo.suite.core/src/org/argeo/suite/RankedObject.java
new file mode 100644
index 0000000..bfba46e
--- /dev/null
+++ b/org.argeo.suite.core/src/org/argeo/suite/RankedObject.java
@@ -0,0 +1,98 @@
+package org.argeo.suite;
+
+import java.util.Map;
+
+import org.apache.commons.logging.Log;
+import org.apache.commons.logging.LogFactory;
+
+/**
+ * A container for an object whose relevance can be ranked. Typically used in an
+ * OSGi context with the service.ranking property.
+ */
+public class RankedObject<T> {
+	private final static Log log = LogFactory.getLog(RankedObject.class);
+
+	private final static String SERVICE_RANKING = "service.ranking";
+//	private final static String SERVICE_ID = "service.id";
+
+	private T object;
+	private Map<String, Object> properties;
+	private final Long rank;
+
+	public RankedObject(T object, Map<String, Object> properties) {
+		this(object, properties, extractRanking(properties));
+	}
+
+	public RankedObject(T object, Map<String, Object> properties, Long rank) {
+		super();
+		this.object = object;
+		this.properties = properties;
+		this.rank = rank;
+	}
+
+	private static Long extractRanking(Map<String, Object> properties) {
+		if (properties == null)
+			return 0l;
+		if (properties.containsKey(SERVICE_RANKING))
+			return Long.valueOf(properties.get(SERVICE_RANKING).toString());
+//		else if (properties.containsKey(SERVICE_ID))
+//			return (Long) properties.get(SERVICE_ID);
+		else
+			return 0l;
+	}
+
+	public T get() {
+		return object;
+	}
+
+	public Map<String, Object> getProperties() {
+		return properties;
+	}
+
+	public Long getRank() {
+		return rank;
+	}
+
+	@Override
+	public int hashCode() {
+		return object.hashCode();
+	}
+
+	@Override
+	public boolean equals(Object obj) {
+		if (!(obj instanceof RankedObject))
+			return false;
+		RankedObject<?> other = (RankedObject<?>) obj;
+		return rank.equals(other.rank) && object.equals(other.object);
+	}
+
+	@Override
+	public String toString() {
+		return object.getClass().getName() + " with rank " + rank;
+	}
+
+	public static <K, T> RankedObject<T> putIfHigherRank(Map<K, RankedObject<T>> map, K key, T object,
+			Map<String, Object> properties) {
+		RankedObject<T> rankedObject = new RankedObject<>(object, properties);
+		if (!map.containsKey(key)) {
+			map.put(key, rankedObject);
+			if (log.isTraceEnabled())
+				log.trace(
+						"Added " + key + " as " + object.getClass().getName() + " with rank " + rankedObject.getRank());
+			return rankedObject;
+		} else {
+			RankedObject<T> current = map.get(key);
+			if (current.getRank() <= rankedObject.getRank()) {
+				map.put(key, rankedObject);
+				if (log.isTraceEnabled())
+					log.trace("Replaced " + key + " by " + object.getClass().getName() + " with rank "
+							+ rankedObject.getRank());
+				return rankedObject;
+			} else {
+				return current;
+			}
+		}
+
+	}
+
+}