This commit was manufactured by cvs2svn to create tag 'v20090204-1930'.v20090204-1930

Sprout from master 2009-02-04 22:59:53 UTC Boris Bokowski <bbokowski> 'Had to fix problems after merge with Paul's changes - Bug 263710 Get rid of weird IHasInput interface'
Cherrypick from master 2009-02-04 18:56:24 UTC John Arthorne <johna> 'API cleanup':
    bundles/org.eclipse.e4.core.services/src/org/eclipse/e4/core/services/internal/context/ActiveChildValue.java

1 files changed, 38 insertions, 0 deletions

diff --git a/bundles/org.eclipse.e4.core.services/src/org/eclipse/e4/core/services/internal/context/ActiveChildValue.java b/bundles/org.eclipse.e4.core.services/src/org/eclipse/e4/core/services/internal/context/ActiveChildValue.java
new file mode 100644
index 000000000..89d49f3b5
--- /dev/null
+++ b/bundles/org.eclipse.e4.core.services/src/org/eclipse/e4/core/services/internal/context/ActiveChildValue.java
@@ -0,0 +1,38 @@
+/*******************************************************************************
+ * Copyright (c) 2009 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+
+package org.eclipse.e4.core.services.internal.context;
+
+import org.eclipse.e4.core.services.context.IEclipseContext;
+import org.eclipse.e4.core.services.context.spi.IComputedValue;
+
+/**
+ * A computed value that delegates lookup to a child context.
+ * TODO: There might be different bundles with their own notion of "active child",
+ * so to make this more reusable the "activeChild" constant should likely be pulled
+ * out and live in the UI ("activeChildControl" or some such), allowing others to store 
+ * their own notion of child under a different key.
+ */
+public final class ActiveChildValue implements IComputedValue {
+	private final String attr;
+
+	public ActiveChildValue(String attr) {
+		this.attr = attr;
+	}
+
+	public Object compute(IEclipseContext context, String[] arguments) {
+		if (context.isSet("activeChild")) {
+			IEclipseContext childContext = (IEclipseContext) context.get("activeChild");
+			return childContext.get(attr);
+		}
+		return null;
+	}
+}
\ No newline at end of file