Bug 384646: Improves the performance of the install software filter.v20121119-205721

This changeset results in caching the children in a category, so each
time a key is typed we don't need to compute it. 

1 files changed, 7 insertions, 0 deletions

diff --git a/bundles/org.eclipse.equinox.p2.ui/src/org/eclipse/equinox/internal/p2/ui/model/QueriedElement.java b/bundles/org.eclipse.equinox.p2.ui/src/org/eclipse/equinox/internal/p2/ui/model/QueriedElement.java
index a478e683f..451cfc74b 100644
--- a/bundles/org.eclipse.equinox.p2.ui/src/org/eclipse/equinox/internal/p2/ui/model/QueriedElement.java
+++ b/bundles/org.eclipse.equinox.p2.ui/src/org/eclipse/equinox/internal/p2/ui/model/QueriedElement.java
@@ -66,6 +66,10 @@ public abstract class QueriedElement extends ProvElement {
 	}
 
 	public Object[] getChildren(Object o) {
+		Object[] cache = getCachedChildren();
+		if (cache.length > 0) {
+			return getCachedChildren();
+		}
 		return fetchChildren(o, new NullProgressMonitor());
 	}
 
@@ -159,6 +163,9 @@ public abstract class QueriedElement extends ProvElement {
 	}
 
 	public Object[] getCachedChildren() {
+		if (cachedChildren == null) {
+			return new Object[0];
+		}
 		return cachedChildren.toArray();
 	}