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/*******************************************************************************
* Copyright (c) 2012 Obeo.
* 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:
* Obeo - initial API and implementation
*******************************************************************************/
package org.eclipse.emf.compare.rcp.ui.internal.contentmergeviewer.accessor.impl;
import static com.google.common.collect.Iterables.filter;
import static com.google.common.collect.Iterables.size;
import static com.google.common.collect.Lists.newArrayList;
import static com.google.common.collect.Lists.newArrayListWithCapacity;
import com.google.common.collect.ImmutableList;
import java.util.Iterator;
import java.util.List;
import org.eclipse.emf.common.notify.AdapterFactory;
import org.eclipse.emf.compare.AttributeChange;
import org.eclipse.emf.compare.Diff;
import org.eclipse.emf.compare.Match;
import org.eclipse.emf.compare.ReferenceChange;
import org.eclipse.emf.compare.rcp.ui.internal.mergeviewer.IMergeViewer.MergeViewerSide;
import org.eclipse.emf.compare.rcp.ui.internal.mergeviewer.item.IMergeViewerItem;
import org.eclipse.emf.compare.rcp.ui.internal.mergeviewer.item.impl.MergeViewerItem;
import org.eclipse.emf.compare.utils.DiffUtil;
import org.eclipse.emf.compare.utils.IEqualityHelper;
import org.eclipse.emf.compare.utils.ReferenceUtil;
import org.eclipse.emf.ecore.EObject;
/**
* @author <a href="mailto:mikael.barbero@obeo.fr">Mikael Barbero</a>
*/
public class ManyStructuralFeatureAccessorImpl extends AbstractStructuralFeatureAccessor {
/**
* @param diff
* @param side
*/
public ManyStructuralFeatureAccessorImpl(AdapterFactory adapterFactory, Diff diff, MergeViewerSide side) {
super(adapterFactory, diff, side);
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.rcp.ui.internal.contentmergeviewer.accessor.impl.AbstractStructuralFeatureAccessor.ui.internal.contentmergeviewer.provider.BasicStructuralFeatureAccessorImpl#getItems()
*/
public ImmutableList<? extends IMergeViewerItem> getItems() {
List<? extends IMergeViewerItem> ret;
List<?> list = getFeatureValues(getSide());
ret = createMergeViewerItemFrom(list);
if (getSide() != MergeViewerSide.ANCESTOR) {
ret = createInsertionPoints(ret);
}
return ImmutableList.copyOf(ret);
}
private List<? extends IMergeViewerItem> createMergeViewerItemFrom(List<?> values) {
List<IMergeViewerItem> ret = newArrayListWithCapacity(values.size());
for (Object value : values) {
IMergeViewerItem valueToAdd = createMergeViewerItemFrom(value);
ret.add(valueToAdd);
}
return ret;
}
private IMergeViewerItem createMergeViewerItemFrom(Object object) {
Diff diff = getDiffWithValue(object);
Object left = matchingValue(object, MergeViewerSide.LEFT);
Object right = matchingValue(object, MergeViewerSide.RIGHT);
Object ancestor = matchingValue(object, MergeViewerSide.ANCESTOR);
final boolean leftEmptyBox = !getFeatureValues(MergeViewerSide.LEFT).contains(left);
final boolean rightEmptyBox = !getFeatureValues(MergeViewerSide.RIGHT).contains(right);
if (leftEmptyBox || rightEmptyBox) {
if (leftEmptyBox) {
left = null;
}
if (rightEmptyBox) {
right = null;
}
}
return new MergeViewerItem(getComparison(), diff, left, right, ancestor, getSide(),
getAdapterFactory());
}
private List<? extends IMergeViewerItem> createInsertionPoints(
final List<? extends IMergeViewerItem> values) {
List<IMergeViewerItem> ret = newArrayList(values);
for (Diff diff : getDifferences().reverse()) {
boolean rightToLeft = (getSide() == MergeViewerSide.LEFT);
Object left = getValueFromDiff(diff, MergeViewerSide.LEFT);
Object right = getValueFromDiff(diff, MergeViewerSide.RIGHT);
if (left == null && right == null) {
// Do not display anything
} else {
final boolean leftEmptyBox = getSide() == MergeViewerSide.LEFT
&& (left == null || !getFeatureValues(getSide()).contains(left));
final boolean rightEmptyBox = getSide() == MergeViewerSide.RIGHT
&& (right == null || !getFeatureValues(getSide()).contains(right));
if (leftEmptyBox || rightEmptyBox) {
Object ancestor = getValueFromDiff(diff, MergeViewerSide.ANCESTOR);
if (leftEmptyBox) {
left = null;
}
if (rightEmptyBox) {
right = null;
}
IMergeViewerItem insertionPoint = new MergeViewerItem(getComparison(), diff, left, right,
ancestor, getSide(), getAdapterFactory());
final int insertionIndex = Math.min(findInsertionIndex(diff, rightToLeft), ret.size());
List<IMergeViewerItem> subList = ret.subList(0, insertionIndex);
final int nbInsertionPointBefore = size(filter(subList,
IMergeViewerItem.IS_INSERTION_POINT));
int index = Math.min(insertionIndex + nbInsertionPointBefore, ret.size());
ret.add(index, insertionPoint);
}
}
}
return ret;
}
protected int findInsertionIndex(Diff diff, boolean rightToLeft) {
return DiffUtil.findInsertionIndex(getComparison(), diff, rightToLeft);
}
/**
*
*/
private Diff getDiffWithValue(Object value) {
Diff ret = null;
for (Diff diff : getDifferences()) {
Object valueOfDiff = getValueFromDiff(diff, getSide());
if (valueOfDiff == value) {
ret = diff;
break;
}
}
return ret;
}
/**
* @param diff
* @param side
* @return
*/
protected Object getValueFromDiff(final Diff diff, MergeViewerSide side) {
Object diffValue = getDiffValue(diff);
Object ret = matchingValue(diffValue, side);
return ret;
}
private Object matchingValue(Object object, MergeViewerSide side) {
final Object ret;
if (object instanceof EObject) {
final Match matchOfValue = getComparison().getMatch((EObject)object);
if (matchOfValue != null) {
switch (side) {
case ANCESTOR:
ret = matchOfValue.getOrigin();
break;
case LEFT:
ret = matchOfValue.getLeft();
break;
case RIGHT:
ret = matchOfValue.getRight();
break;
default:
throw new IllegalStateException();
}
} else {
ret = matchingValue(object, getFeatureValues(side));
}
} else {
ret = matchingValue(object, getFeatureValues(side));
}
return ret;
}
private Object matchingValue(Object value, List<?> in) {
Object ret = null;
IEqualityHelper equalityHelper = getComparison().getEqualityHelper();
Iterator<?> valuesIterator = in.iterator();
while (valuesIterator.hasNext() && ret == null) {
Object object = valuesIterator.next();
if (equalityHelper.matchingValues(object, value)) {
ret = object;
}
}
return ret;
}
/**
* Returns the values of the current feature on the given side.
*
* @param side
* @return
*/
protected List<?> getFeatureValues(MergeViewerSide side) {
final EObject eObject = getEObject(side);
return ReferenceUtil.getAsList(eObject, getStructuralFeature());
}
/**
* Returns either {@link ReferenceChange#getValue()} or {@link AttributeChange#getValue()} depending on
* the runtime type of the give {@code diff} or null otherwise.
*
* @param diff
* @return
*/
protected Object getDiffValue(Diff diff) {
final Object ret;
if (diff instanceof ReferenceChange) {
ret = ((ReferenceChange)diff).getValue();
} else if (diff instanceof AttributeChange) {
ret = ((AttributeChange)diff).getValue();
} else {
ret = null;
}
return ret;
}
}
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