Moving the implementation to IDE.UI. For CVS, we depend on

[EMFCompare2.git] / plugins / org.eclipse.emf.compare.edit / src / org / eclipse / emf / compare / provider / spec / MatchResourceItemProviderSpec.java

/*******************************************************************************
 * 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.provider.spec;

import org.eclipse.emf.common.notify.AdapterFactory;
import org.eclipse.emf.compare.MatchResource;
import org.eclipse.emf.compare.provider.MatchResourceItemProvider;

/**
 * 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 {

        /**
         * Constructor calling super {@link #MatchResourceItemProviderSpec(AdapterFactory)}.
         * 
         * @param adapterFactory
         *            the adapter factory
         */
        public MatchResourceItemProviderSpec(AdapterFactory adapterFactory) {
                super(adapterFactory);
        }

        /**
         * {@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());
                }
                // TODO is that really useful info?
                // if (matchResource.eContainer() instanceof Comparison
                // && ((Comparison)matchResource.eContainer()).isThreeWay()) {
                // final String originURI = matchResource.getOriginURI();
                // text += " (" + originURI + ")";
                // }
                return text;
        }

        /**
         * 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();
                for (int i = 0; i < Math.min(leftChars.length, rightChars.length); i++) {
                        if (leftChars[i] == rightChars[i]) {
                                buffer.append(leftChars[i]);
                        } else {
                                break;
                        }
                }

                return buffer.toString();
        }
}