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/*******************************************************************************
* Copyright (c) 2004, 2007 Boeing.
* 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:
* Boeing - initial API and implementation
*******************************************************************************/
package org.eclipse.osee.framework.ui.skynet;
import java.util.Collections;
import java.util.List;
import java.util.logging.Level;
import org.eclipse.jface.viewers.IContentProvider;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.osee.framework.db.connection.exception.OseeCoreException;
import org.eclipse.osee.framework.logging.OseeLog;
import org.eclipse.osee.framework.skynet.core.artifact.Artifact;
import org.eclipse.osee.framework.skynet.core.relation.RelationLink;
import org.eclipse.osee.framework.skynet.core.relation.RelationSide;
import org.eclipse.osee.framework.skynet.core.relation.RelationType;
import org.eclipse.osee.framework.skynet.core.relation.RelationTypeManager;
import org.eclipse.osee.framework.skynet.core.relation.RelationTypeSide;
/**
* The basis for the comments in this class can be found at
* http://www.eclipse.org/articles/treeviewer-cg/TreeViewerArticle.htm
*
* @author Ryan D. Brooks
*/
public class RelationContentProvider implements ITreeContentProvider {
private static Object[] EMPTY_ARRAY = new Object[0];
private Artifact artifact;
/*
* @see IContentProvider#dispose()
*/
public void dispose() {
}
/**
* Notifies this content provider that the given viewer's input has been switched to a different element.
* <p>
* A typical use for this method is registering the content provider as a listener to changes on the new input (using
* model-specific means), and deregistering the viewer from the old input. In response to these change notifications,
* the content provider propagates the changes to the viewer.
* </p>
*
* @param viewer the viewer
* @param oldInput the old input element, or <code>null</code> if the viewer did not previously have an input
* @param newInput the new input element, or <code>null</code> if the viewer does not have an input
* @see IContentProvider#inputChanged(Viewer, Object, Object)
*/
public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {
this.artifact = (Artifact) newInput;
}
/**
* The tree viewer calls its content provider’s getChildren method when it needs to create or display the child
* elements of the domain object, <b>parent </b>. This method should answer an array of domain objects that represent
* the unfiltered children of <b>parent </b>
*
* @see ITreeContentProvider#getChildren(Object)
*/
public Object[] getChildren(Object parentElement) {
try {
if (parentElement instanceof Artifact) {
Artifact artifact = (Artifact) parentElement;
List<RelationType> relationTypes =
RelationTypeManager.getValidTypes(artifact.getArtifactType(), artifact.getBranch());
return relationTypes.toArray();
} else if (parentElement instanceof RelationType) {
RelationType relationType = (RelationType) parentElement;
int sideAMax =
RelationTypeManager.getRelationSideMax(relationType, artifact.getArtifactType(), RelationSide.SIDE_A);
int sideBMax =
RelationTypeManager.getRelationSideMax(relationType, artifact.getArtifactType(), RelationSide.SIDE_B);
RelationTypeSide sideA = new RelationTypeSide(relationType, RelationSide.SIDE_A, artifact);
RelationTypeSide sideB = new RelationTypeSide(relationType, RelationSide.SIDE_B, artifact);
boolean onSideA = sideBMax > 0;
boolean onSideB = sideAMax > 0;
if (onSideA && onSideB) {
return new Object[] {sideA, sideB};
} else if (onSideA) {
return new Object[] {sideA};
} else if (onSideB) {
return new Object[] {sideB};
}
} else if (parentElement instanceof RelationTypeSide) {
RelationTypeSide relationTypeSide = (RelationTypeSide) parentElement;
artifact.getRelatedArtifacts(relationTypeSide); // ensure the artifacts are bulk loaded; otherwise the sort will be slower
List<RelationLink> relations = artifact.getRelations(relationTypeSide);
if (!relationTypeSide.getRelationType().isOrdered()) {
Collections.sort(relations, new AlphabeticalRelationComparator(relationTypeSide.getSide()));
}
return relations.toArray();
}
} catch (OseeCoreException ex) {
OseeLog.log(SkynetGuiPlugin.class, Level.SEVERE, ex);
}
return EMPTY_ARRAY;
}
/*
* @see ITreeContentProvider#getParent(Object)
*/
public Object getParent(Object element) {
return null;
}
/**
* The tree viewer asks its content provider if the domain object represented by <b>element </b> has any children.
* This method is used by the tree viewer to determine whether or not a plus or minus should appear on the tree
* widget.
*
* @see ITreeContentProvider#hasChildren(Object)
*/
public boolean hasChildren(Object element) {
if (element instanceof RelationTypeSide) {
try {
return artifact.getRelatedArtifactsCount((RelationTypeSide) element) > 0;
} catch (OseeCoreException ex) {
OseeLog.log(SkynetGuiPlugin.class, Level.SEVERE, ex);
return false;
}
}
return getChildren(element).length > 0;
}
/**
* This is the method invoked by calling the <b>setInput </b> method on the tree viewer. In fact, the <b>getElements
* </b> method is called only in response to the tree viewer's <b>setInput </b> method and should answer with the
* appropriate domain objects of the inputElement. The <b>getElements </b> and <b>getChildren </b> methods operate in
* a similar way. Depending on your domain objects, you may have the <b>getElements </b> simply return the result of
* calling <b>getChildren </b>. The two methods are kept distinct because it provides a clean way to differentiate
* between the root domain object and all other domain objects.
*
* @see IStructuredContentProvider#getElements(Object)
*/
public Object[] getElements(Object inputElement) {
return getChildren(inputElement);
}
}
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