/*******************************************************************************
* Copyright (C) 2008, Marek Zawirski <marek.zawirski@gmail.com>
* Copyright (C) 2010, Chris Aniszczyk <caniszczyk@gmail.com>
*
* 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
*******************************************************************************/
package org.eclipse.egit.ui.internal.components;
import java.io.IOException;
import org.eclipse.egit.ui.Activator;
import org.eclipse.egit.ui.internal.UIText;
import org.eclipse.jface.fieldassist.IContentProposal;
import org.eclipse.jgit.lib.Constants;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.lib.ObjectLoader;
import org.eclipse.jgit.lib.ObjectReader;
import org.eclipse.jgit.lib.PersonIdent;
import org.eclipse.jgit.lib.Ref;
import org.eclipse.jgit.lib.Repository;
import org.eclipse.jgit.revwalk.RevCommit;
import org.eclipse.jgit.revwalk.RevTag;
import org.eclipse.jgit.revwalk.RevWalk;
import org.eclipse.osgi.util.NLS;
/**
* Content proposal class for refs names, specifically Ref objects - name with
* optionally associated object id. This class can be used for Eclipse field
* assist as content proposal.
* <p>
* Content of this proposal is simply a ref name, but description and labels
* tries to be smarter - showing easier to read label for user (stripping
* prefixes) and information about pointed object if it exists locally.
*/
public class RefContentProposal implements IContentProposal {
private static final String PREFIXES[] = new String[] { Constants.R_HEADS,
Constants.R_REMOTES, Constants.R_TAGS };
private final static String branchPF = " [" //$NON-NLS-1$
+ UIText.RefContentProposal_branch
+ "]"; //$NON-NLS-1$
private final static String trackingBranchPF = " [" //$NON-NLS-1$
+ UIText.RefContentProposal_trackingBranch
+ "]"; //$NON-NLS-1$
private final static String tagPF = " [" //$NON-NLS-1$
+ UIText.RefContentProposal_tag
+ "]"; //$NON-NLS-1$
private static final String PREFIXES_DESCRIPTIONS[] = new String[] {
branchPF, trackingBranchPF, tagPF };
private static void appendObjectSummary(final StringBuilder sb,
final String type, final PersonIdent author, final String message) {
sb.append(type);
sb.append(" "); //$NON-NLS-1$
sb.append(UIText.RefContentProposal_by);
sb.append(" "); //$NON-NLS-1$
sb.append(author.getName());
sb.append("\n"); //$NON-NLS-1$
sb.append(author.getWhen());
sb.append("\n\n"); //$NON-NLS-1$
final int newLine = message.indexOf('\n');
final int last = (newLine != -1 ? newLine : message.length());
sb.append(message.substring(0, last));
}
private final Repository db;
private final String refName;
private final ObjectId objectId;
/**
* Create content proposal for specified ref.
*
* @param repo
* repository for accessing information about objects. Could be a
* local repository even for remote objects.
* @param ref
* ref being a content proposal. May have null or locally
* non-existent object id.
*/
public RefContentProposal(final Repository repo, final Ref ref) {
this(repo, ref.getName(), ref.getObjectId());
}
/**
* Create content proposal for specified ref name and object id.
*
* @param repo
* repository for accessing information about objects. Could be a
* local repository even for remote objects.
* @param refName
* ref name being a content proposal.
* @param objectId
* object being pointed by this ref name. May be null or locally
* non-existent object.
*/
public RefContentProposal(final Repository repo, final String refName,
final ObjectId objectId) {
this.db = repo;
this.refName = refName;
this.objectId = objectId;
}
public String getContent() {
return refName;
}
public int getCursorPosition() {
return refName.length();
}
public String getDescription() {
if (objectId == null)
return null;
ObjectReader reader = db.newObjectReader();
try {
final ObjectLoader loader = reader.open(objectId);
final StringBuilder sb = new StringBuilder();
sb.append(refName);
sb.append('\n');
sb.append(reader.abbreviate(objectId).name());
sb.append(" - "); //$NON-NLS-1$
switch (loader.getType()) {
case Constants.OBJ_COMMIT:
RevCommit c = new RevWalk(db).parseCommit(objectId);
appendObjectSummary(sb, UIText.RefContentProposal_commit, c
.getAuthorIdent(), c.getFullMessage());
break;
case Constants.OBJ_TAG:
RevWalk walk = new RevWalk(db);
RevTag t = walk.parseTag(objectId);
appendObjectSummary(sb, UIText.RefContentProposal_tag, t
.getTaggerIdent(), t.getFullMessage());
break;
case Constants.OBJ_TREE:
sb.append(UIText.RefContentProposal_tree);
break;
case Constants.OBJ_BLOB:
sb.append(UIText.RefContentProposal_blob);
break;
default:
sb.append(UIText.RefContentProposal_unknownObject);
}
return sb.toString();
} catch (IOException e) {
Activator.logError(NLS.bind(
UIText.RefContentProposal_errorReadingObject, objectId), e);
return null;
} finally {
reader.release();
}
}
public String getLabel() {
for (int i = 0; i < PREFIXES.length; i++)
if (refName.startsWith(PREFIXES[i]))
return refName.substring(PREFIXES[i].length())
+ PREFIXES_DESCRIPTIONS[i];
return refName;
}
}