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/*******************************************************************************
* Copyright (c) 2012, 2016 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
* Philip Langer (EclipseSource) - bug 488618
*******************************************************************************/
package org.eclipse.emf.compare.provider.spec;
import static com.google.common.base.Predicates.not;
import com.google.common.base.Predicate;
import org.eclipse.emf.common.notify.AdapterFactory;
import org.eclipse.emf.compare.Comparison;
import org.eclipse.emf.compare.MatchResource;
import org.eclipse.emf.compare.ResourceAttachmentChange;
import org.eclipse.emf.compare.provider.IItemDescriptionProvider;
import org.eclipse.emf.compare.provider.IItemStyledLabelProvider;
import org.eclipse.emf.compare.provider.MatchResourceItemProvider;
import org.eclipse.emf.compare.provider.SafeAdapterFactoryItemDelegator;
import org.eclipse.emf.compare.provider.utils.ComposedStyledString;
import org.eclipse.emf.compare.provider.utils.IStyledString;
import org.eclipse.emf.ecore.resource.Resource;
import org.eclipse.emf.edit.provider.AdapterFactoryItemDelegator;
/**
* Specialized {@link MatchResourceItemProvider} returning nice output for {@link #getText(Object)} and
* {@link #getImage(Object)}.
*
* @author <a href="mailto:mikael.barbero@obeo.fr">Mikael Barbero</a>
*/
public class MatchResourceItemProviderSpec extends MatchResourceItemProvider implements IItemStyledLabelProvider, IItemDescriptionProvider {
/** The item delegator for matched resources. */
private final AdapterFactoryItemDelegator itemDelegator;
/**
* Constructor calling super {@link #MatchResourceItemProviderSpec(AdapterFactory)}.
*
* @param adapterFactory
* the adapter factory
*/
public MatchResourceItemProviderSpec(AdapterFactory adapterFactory) {
super(adapterFactory);
itemDelegator = new SafeAdapterFactoryItemDelegator(getRootAdapterFactory());
}
/**
* Predicate to check if the URI of the current attachment change is equal to one (at least) of the URIs
* of the resources matched by the given <code>MatchResource</code>.
*
* @param matchResource
* The match resource.
* @return The predicate.
*/
private static Predicate<ResourceAttachmentChange> uriEqualToOneAtLeast(
final MatchResource matchResource) {
return new Predicate<ResourceAttachmentChange>() {
public boolean apply(ResourceAttachmentChange difference) {
final String diffResourceURI = difference.getResourceURI();
return diffResourceURI != null && (diffResourceURI.equals(matchResource.getLeftURI())
|| diffResourceURI.equals(matchResource.getRightURI())
|| diffResourceURI.equals(matchResource.getOriginURI()));
}
};
}
/**
* Predicate to check if the URI of the current attachment change is different from all the URIs of the
* resources matched by the given <code>MatchResource</code>.
*
* @param matchResource
* The match resource.
* @return The predicate.
* @since 3.0
*/
public static final Predicate<ResourceAttachmentChange> uriDifferentFromAll(
final MatchResource matchResource) {
return not(uriEqualToOneAtLeast(matchResource));
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.provider.MatchResourceItemProvider#getText(java.lang.Object)
*/
@Override
public String getText(Object object) {
final MatchResource matchResource = (MatchResource)object;
final String leftURI = matchResource.getLeftURI();
final String rightURI = matchResource.getRightURI();
final String commonBase = getCommonBase(leftURI, rightURI);
String text = ""; //$NON-NLS-1$
if (leftURI != null) {
text += leftURI.substring(commonBase.length());
}
text += " <-> "; //$NON-NLS-1$
if (rightURI != null) {
text += rightURI.substring(commonBase.length());
}
if (matchResource.eContainer() instanceof Comparison
&& ((Comparison)matchResource.eContainer()).isThreeWay()) {
final String originURI = matchResource.getOriginURI();
if (originURI != null) {
text += " (" + originURI.substring(commonBase.length()) + ")"; //$NON-NLS-1$ //$NON-NLS-2$
}
}
return text;
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.provider.MatchResourceItemProvider#getImage(java.lang.Object)
*/
@Override
public Object getImage(Object object) {
final MatchResource matchResource = (MatchResource)object;
Resource resource = matchResource.getLeft();
Object image = null;
if (resource == null) {
resource = matchResource.getRight();
if (resource == null) {
resource = matchResource.getOrigin();
}
}
if (resource != null) {
image = itemDelegator.getImage(resource);
if (image == null) {
image = super.getImage(object);
}
} else {
image = super.getImage(object);
}
return image;
}
/**
* Returns the longest common starting substring of the two given strings.
*
* @param left
* First of the two strings for which we need the common starting substring.
* @param right
* Second of the two strings for which we need the common starting substring.
* @return The longest common starting substring of the two given strings.
*/
public String getCommonBase(String left, String right) {
if (left == null || right == null) {
return ""; //$NON-NLS-1$
}
final char[] leftChars = left.toCharArray();
final char[] rightChars = right.toCharArray();
final StringBuilder buffer = new StringBuilder();
StringBuilder fragmentBuffer = new StringBuilder();
for (int i = 0; i < Math.min(leftChars.length, rightChars.length); i++) {
if (leftChars[i] == rightChars[i]) {
fragmentBuffer.append(leftChars[i]);
if (leftChars[i] == '\\' || leftChars[i] == '/') {
buffer.append(fragmentBuffer);
fragmentBuffer = new StringBuilder();
}
} else {
break;
}
}
return buffer.toString();
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.provider.IItemStyledLabelProvider#getStyledText(java.lang.Object)
*/
@Override
public IStyledString.IComposedStyledString getStyledText(Object object) {
return new ComposedStyledString(getText(object));
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.provider.IItemDescriptionProvider#getDescription(java.lang.Object)
*/
public String getDescription(Object object) {
return getText(object);
}
}
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