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/*******************************************************************************
* Copyright (c) 2013, 2015 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.uml2.internal.provider.custom;
import org.eclipse.emf.common.notify.AdapterFactory;
import org.eclipse.emf.compare.DifferenceKind;
import org.eclipse.emf.compare.provider.ExtendedAdapterFactoryItemDelegator;
import org.eclipse.emf.compare.provider.IItemDescriptionProvider;
import org.eclipse.emf.compare.provider.IItemStyledLabelProvider;
import org.eclipse.emf.compare.provider.ISemanticObjectLabelProvider;
import org.eclipse.emf.compare.provider.spec.Strings;
import org.eclipse.emf.compare.provider.utils.ComposedStyledString;
import org.eclipse.emf.compare.provider.utils.IStyledString;
import org.eclipse.emf.compare.provider.utils.IStyledString.Style;
import org.eclipse.emf.compare.uml2.internal.UMLDiff;
import org.eclipse.emf.compare.uml2.internal.provider.UMLDiffItemProvider;
import org.eclipse.emf.ecore.EObject;
/**
* An extended {@link org.eclipse.emf.compare.uml2.internal.provider.UMLDiffItemProvider} that handles
* {@link org.eclipse.emf.compare.provider.IItemStyledLabelProvider} and
* {@link org.eclipse.emf.compare.provider.IItemDescriptionProvider}.
*
* @author <a href="mailto:mikael.barbero@obeo.fr">Mikael Barbero</a>
*/
public class UMLDiffCustomItemProvider extends UMLDiffItemProvider implements IItemStyledLabelProvider, IItemDescriptionProvider, ISemanticObjectLabelProvider {
/**
* The maximum length of displayed text.
*/
private static final int MAX_LENGTH = 50;
/** The item delegator to reuse root adapter factory (if any). */
private final ExtendedAdapterFactoryItemDelegator itemDelegator;
/**
* This constructs an instance from a factory and a notifier.
*
* @param adapterFactory
* the adapter factory to use.
*/
public UMLDiffCustomItemProvider(AdapterFactory adapterFactory) {
super(adapterFactory);
itemDelegator = new ExtendedAdapterFactoryItemDelegator(getRootAdapterFactory());
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.provider.IItemDescriptionProvider#getDescription(java.lang.Object)
*/
public String getDescription(Object object) {
return itemDelegator.getDescription(object);
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.provider.ISemanticObjectLabelProvider#getSemanticObjectLabel(java.lang.Object)
*/
public String getSemanticObjectLabel(Object object) {
final UMLDiff umlDiff = (UMLDiff)object;
return getValueText(umlDiff);
}
/**
* {@inheritDoc}
*
* @see org.eclipse.emf.compare.provider.IItemStyledLabelProvider#getStyledText(java.lang.Object)
*/
@Override
public IStyledString.IComposedStyledString getStyledText(Object object) {
final UMLDiff umlDiff = (UMLDiff)object;
final String valueText = getValueText(umlDiff);
final String referenceText = getReferenceText(umlDiff);
ComposedStyledString ret = new ComposedStyledString(valueText);
ret.append(" [" + referenceText, Style.DECORATIONS_STYLER); //$NON-NLS-1$
switch (umlDiff.getKind()) {
case ADD:
ret.append(" add", Style.DECORATIONS_STYLER); //$NON-NLS-1$
break;
case DELETE:
ret.append(" delete", Style.DECORATIONS_STYLER); //$NON-NLS-1$
break;
case CHANGE:
ret.append(" change", Style.DECORATIONS_STYLER); //$NON-NLS-1$
break;
case MOVE:
ret.append(" move", Style.DECORATIONS_STYLER); //$NON-NLS-1$
break;
default:
throw new IllegalStateException("Unsupported " + DifferenceKind.class.getSimpleName() //$NON-NLS-1$
+ " value: " + umlDiff.getKind()); //$NON-NLS-1$
}
ret.append("]", Style.DECORATIONS_STYLER); //$NON-NLS-1$
return ret;
}
/**
* Returns the value text for the given umlDiff.
*
* @param umlDiff
* the given {@link UMLDiff}.
* @return the value text.
*/
private String getValueText(final UMLDiff umlDiff) {
String value = itemDelegator.getText(umlDiff.getDiscriminant());
if (value == null) {
value = "<null>"; //$NON-NLS-1$
} else {
value = Strings.elide(value, MAX_LENGTH, "..."); //$NON-NLS-1$
}
return value;
}
/**
* Returns the reference text for the given umlDiff.
*
* @param umlDiff
* the given {@link UMLDiff}.
* @return the reference text.
*/
private static String getReferenceText(final UMLDiff umlDiff) {
String ret = ""; //$NON-NLS-1$
switch (umlDiff.getKind()) {
case ADD:
case DELETE:
case MOVE:
EObject discriminant = umlDiff.getDiscriminant();
ret = discriminant.eContainingFeature().getName();
break;
case CHANGE:
break;
default:
throw new IllegalStateException("Unsupported " + DifferenceKind.class.getSimpleName() //$NON-NLS-1$
+ " value: " + umlDiff.getKind()); //$NON-NLS-1$
}
return ret;
}
/**
* Gets the item delegator.
*
* @return {@link ExtendedAdapterFactoryItemDelegator}.
*/
protected ExtendedAdapterFactoryItemDelegator getItemDelegator() {
return itemDelegator;
}
}
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