1 files changed, 120 insertions, 0 deletions
diff --git a/org.eclipse.ui.genericeditor/src/org/eclipse/ui/internal/genericeditor/hover/CompositeInformationControlCreator.java b/org.eclipse.ui.genericeditor/src/org/eclipse/ui/internal/genericeditor/hover/CompositeInformationControlCreator.java
new file mode 100644
index 00000000000..ddeee67056c
--- /dev/null
+++ b/org.eclipse.ui.genericeditor/src/org/eclipse/ui/internal/genericeditor/hover/CompositeInformationControlCreator.java
@@ -0,0 +1,120 @@
+/*******************************************************************************
+ * Copyright (c) 2017 Red Hat Inc. 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:
+ * - Mickael Istria (Red Hat Inc.)
+ *******************************************************************************/
+package org.eclipse.ui.internal.genericeditor.hover;
+
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map.Entry;
+
+import org.eclipse.jface.text.AbstractReusableInformationControlCreator;
+import org.eclipse.jface.text.DefaultInformationControl;
+import org.eclipse.jface.text.IInformationControl;
+import org.eclipse.jface.text.IInformationControlCreator;
+import org.eclipse.jface.text.IInformationControlCreatorExtension;
+import org.eclipse.jface.text.ITextHover;
+import org.eclipse.jface.text.ITextHoverExtension;
+import org.eclipse.swt.widgets.Shell;
+
+public class CompositeInformationControlCreator
+		implements IInformationControlCreator, IInformationControlCreatorExtension {
+
+	private final LinkedHashMap<ITextHover, IInformationControlCreator> creators;
+
+	public CompositeInformationControlCreator(List<ITextHover> hovers) {
+		this.creators = new LinkedHashMap<>();
+		for (ITextHover hover : hovers) {
+			creators.put(hover, getInformationControlCreator(hover));
+		}
+	}
+
+	public CompositeInformationControlCreator(LinkedHashMap<ITextHover, IInformationControlCreator> creators) {
+		this.creators = creators;
+	}
+
+	private static IInformationControlCreator getInformationControlCreator(ITextHover hover) {
+		IInformationControlCreator controlCreator = null;
+		if (hover instanceof ITextHoverExtension) {
+			controlCreator = ((ITextHoverExtension)hover).getHoverControlCreator();
+		}
+		if (controlCreator == null) {
+			controlCreator = new AbstractReusableInformationControlCreator() {
+				@Override
+				protected IInformationControl doCreateInformationControl(Shell parent) {
+					return new DefaultInformationControl(parent, true);
+				}
+			};
+		}
+		return controlCreator;
+	}
+
+
+	@Override
+	public boolean canReuse(IInformationControl control) {
+		if (control.getClass() != CompositeInformationControl.class) {
+			return false;
+		}
+		CompositeInformationControl other = (CompositeInformationControl)control;
+		if (!other.creators.equals(this.creators)) {
+			return false;
+		}
+		Iterator<Entry<ITextHover, IInformationControlCreator>> thisIterator = this.creators.entrySet().iterator();
+		Iterator<Entry<ITextHover, IInformationControl>> otherIterator = other.controls.entrySet().iterator();
+		do {
+			Entry<ITextHover, IInformationControlCreator> thisEntry = thisIterator.next();
+			Entry<ITextHover, IInformationControl> otherEntry = otherIterator.next();
+			if (!thisEntry.getKey().equals(otherEntry.getKey())) {
+				return false;
+			}
+			if (!(thisEntry.getValue() instanceof IInformationControlCreatorExtension)) {
+				return false;
+			}
+			if (!((IInformationControlCreatorExtension)thisEntry.getValue()).canReuse(otherEntry.getValue())) {
+				return false;
+			}
+		} while (thisIterator.hasNext());
+		return true;
+	}
+
+	@Override
+	public boolean canReplace(IInformationControlCreator creator) {
+		if (creator.getClass() != this.getClass()) {
+			return false;
+		}
+		CompositeInformationControlCreator other = (CompositeInformationControlCreator)creator;
+		if (other.creators.size() != this.creators.size()) {
+			return false;
+		}
+		Iterator<Entry<ITextHover, IInformationControlCreator>> thisIterator = this.creators.entrySet().iterator();
+		Iterator<Entry<ITextHover, IInformationControlCreator>> otherIterator = other.creators.entrySet().iterator();
+		do {
+			Entry<ITextHover, IInformationControlCreator> thisEntry = thisIterator.next();
+			Entry<ITextHover, IInformationControlCreator> otherEntry = otherIterator.next();
+			if (!thisEntry.getKey().equals(otherEntry.getKey())) {
+				return false;
+			}
+			if (!(thisEntry.getValue() instanceof IInformationControlCreatorExtension)) {
+				return false;
+			}
+			if (!((IInformationControlCreatorExtension)thisEntry.getValue()).canReplace(otherEntry.getValue())) {
+				return false;
+			}
+		} while (thisIterator.hasNext());
+		return true;
+	}
+	
+
+	@Override
+	public IInformationControl createInformationControl(Shell parent) {
+		return new CompositeInformationControl(parent, this.creators);
+	}
+
+}