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/*******************************************************************************
* Copyright (c) 2017 EclipseSource Services GmbH 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:
* Philip Langer - initial API and implementation
*******************************************************************************/
package org.eclipse.emf.compare.ide.ui.internal.structuremergeviewer.actions;
import static com.google.common.collect.Iterables.concat;
import static com.google.common.collect.Iterables.filter;
import static com.google.common.collect.Iterables.transform;
import com.google.common.base.Function;
import com.google.common.base.Predicate;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableList.Builder;
import com.google.common.collect.Lists;
import java.util.List;
import org.eclipse.compare.INavigatable;
import org.eclipse.emf.common.notify.Adapter;
import org.eclipse.emf.common.notify.Notifier;
import org.eclipse.emf.common.util.TreeIterator;
import org.eclipse.emf.compare.Diff;
import org.eclipse.emf.compare.internal.merge.MergeMode;
import org.eclipse.emf.compare.merge.IMerger.Registry;
import org.eclipse.emf.compare.rcp.ui.internal.configuration.IEMFCompareConfiguration;
import org.eclipse.emf.compare.rcp.ui.internal.structuremergeviewer.groups.provider.GroupItemProviderAdapter;
import org.eclipse.emf.compare.rcp.ui.structuremergeviewer.groups.IDifferenceGroup;
import org.eclipse.emf.ecore.EObject;
import org.eclipse.emf.edit.tree.TreeNode;
import org.eclipse.jface.viewers.IStructuredSelection;
/**
* Abstract {@link MergeAction} for merging all diffs contained in the selection.
*
* @author Philip Langer <planger@eclipsesource.com>
* @since 4.5
*/
public abstract class AbstractMergeContainedAction extends MergeAction {
/**
* Function for transforming a tree node into all non-filtered leaf differences.
*/
private static Function<TreeNode, Iterable<Diff>> treeNodesToLeafDiffs(
final Predicate<TreeNode> isFiltered) {
return new Function<TreeNode, Iterable<Diff>>() {
public Iterable<Diff> apply(TreeNode input) {
final TreeIterator<EObject> allContents = input.eAllContents();
final Builder<Diff> builder = new ImmutableList.Builder<Diff>();
while (allContents.hasNext()) {
final EObject eObject = allContents.next();
if (eObject instanceof TreeNode) {
final TreeNode treeNode = (TreeNode)eObject;
final EObject data = IDifferenceGroup.TREE_NODE_DATA.apply(treeNode);
if (data instanceof Diff && !isFiltered.apply(treeNode)) {
builder.add((Diff)data);
}
}
}
return builder.build();
}
};
}
/**
* The predicate to determine whether a tree node is filtered.
*/
protected Predicate<TreeNode> isFiltered;
public AbstractMergeContainedAction(IEMFCompareConfiguration compareConfiguration,
Registry mergerRegistry, MergeMode mode, INavigatable navigatable) {
super(compareConfiguration, mergerRegistry, mode, navigatable);
}
public AbstractMergeContainedAction(IEMFCompareConfiguration compareConfiguration,
Registry mergerRegistry, MergeMode mode, INavigatable navigatable,
IStructuredSelection selection) {
super(compareConfiguration, mergerRegistry, mode, navigatable, selection);
}
/**
* Return a predicate that filters the {{@link #getSelectedDifferences() selected differences} to just
* those differences this action will actually operate upon.
*
* @return a predicate that filters the {{@link #getSelectedDifferences() selected differences}.
*/
protected abstract Predicate<Diff> getDiffPredicate();
@Override
protected boolean updateSelection(IStructuredSelection selection) {
super.updateSelection(selection);
// The action is enabled only there are any selected differences that will change state when this
// action is applied.
return !getSelectedDifferences().isEmpty();
}
@Override
protected Iterable<Diff> getSelectedDifferences(IStructuredSelection selection) {
final List<?> selectedObjects = selection.toList();
Object firstElement = selection.getFirstElement();
if (selection.getFirstElement() instanceof GroupItemProviderAdapter) {
final List<Object> effectiveSelectedObjects = Lists.newArrayList();
effectiveSelectedObjects
.addAll(((GroupItemProviderAdapter)firstElement).getChildren(firstElement));
final Iterable<TreeNode> selectedTreeNodes = filter(effectiveSelectedObjects, TreeNode.class);
Iterable<Diff> diffs = concat(transform(selectedTreeNodes, treeNodesToLeafDiffs(isFiltered)));
return filter(getSelectedDifferences(diffs), getDiffPredicate());
} else {
final Iterable<Adapter> selectedAdapters = filter(selectedObjects, Adapter.class);
final Iterable<Notifier> selectedNotifiers = transform(selectedAdapters, ADAPTER__TARGET);
final Iterable<TreeNode> selectedTreeNodes = filter(selectedNotifiers, TreeNode.class);
Iterable<Diff> diffs = concat(transform(selectedTreeNodes, treeNodesToLeafDiffs(isFiltered)));
return filter(getSelectedDifferences(diffs), getDiffPredicate());
}
}
}
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