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/*******************************************************************************
* Copyright (c) 2005, 2006 IBM Corporation and others.
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
/**
*
*/
package org.eclipse.team.internal.ccvs.core.filesystem;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.team.core.TeamException;
import org.eclipse.team.internal.ccvs.core.ICVSRemoteFile;
import org.eclipse.team.internal.ccvs.core.ICVSRemoteResource;
import org.eclipse.team.internal.ccvs.core.ILogEntry;
import org.eclipse.team.internal.ccvs.core.client.listeners.ILogEntryListener;
import org.eclipse.team.internal.ccvs.core.util.Util;
class LogEntryCache implements ILogEntryListener {
/*
* Cache of all log entries
*/
private Map entries = new HashMap(); /* Map String:remoteFilePath->Map (String:revision -> ILogEntry) */
Map internalGetLogEntries(String path) {
return (Map) entries.get(path);
}
/**
* Return all the log entries at the given path
* @param path the file path
* @return the log entries for the file
*/
public ILogEntry[] getLogEntries(String path) {
Map map = internalGetLogEntries(path);
return (ILogEntry[]) map.values().toArray(new ILogEntry[map.values().size()]);
}
ILogEntry internalGetLogEntry(String path, String revision) {
Map fileEntries = internalGetLogEntries(path);
if (fileEntries != null) {
return (ILogEntry) fileEntries.get(revision);
}
return null;
}
public String[] getCachedFilePaths() {
return (String[]) entries.keySet().toArray(new String[entries.size()]);
}
/**
* Return the log entry that for the given resource
* or <code>null</code> if no entry was fetched or the
* resource is not a file.
* @param getFullPath(resource) the resource
* @return the log entry or <code>null</code>
*/
public synchronized ILogEntry getLogEntry(ICVSRemoteResource resource) {
if (resource instanceof ICVSRemoteFile) {
try {
String path = getFullPath(resource);
String revision = ((ICVSRemoteFile) resource).getRevision();
return internalGetLogEntry(path, revision);
} catch (TeamException e) {
// Log and return null
}
}
return null;
}
/**
* Return the log entries that were fetched for the given resource
* or an empty list if no entry was fetched.
* @param getFullPath(resource) the resource
* @return the fetched log entries or an empty list is none were found
*/
public synchronized ILogEntry[] getLogEntries(ICVSRemoteResource resource) {
Map fileEntries = internalGetLogEntries(getFullPath(resource));
if (fileEntries != null) {
return (ILogEntry[]) fileEntries.values().toArray(new ILogEntry[fileEntries.size()]);
}
return new ILogEntry[0];
}
/*
* Return the full path that uniquely identifies the resource
* accross repositories. This path include the repository and
* resource path but does not include the revision so that
* all log entries for a file can be retrieved.
*/
String getFullPath(ICVSRemoteResource resource) {
return Util.appendPath(resource.getRepository().getLocation(false), resource.getRepositoryRelativePath());
}
public synchronized void clearEntries() {
entries.clear();
}
public synchronized ICVSRemoteFile getImmediatePredecessor(ICVSRemoteFile file) throws TeamException {
ILogEntry[] allLogs = getLogEntries(file);
String revision = file.getRevision();
// First decrement the last digit and see if that revision exists
String predecessorRevision = getPredecessorRevision(revision);
ICVSRemoteFile predecessor = findRevison(allLogs, predecessorRevision);
// If nothing was found, try to fond the base of a branch
if (predecessor == null && isBrancheRevision(revision)) {
predecessorRevision = getBaseRevision(revision);
predecessor = findRevison(allLogs, predecessorRevision);
}
// If that fails, it is still possible that there is a revision.
// This can happen if the revision has been manually set.
if (predecessor == null) {
// We don't search in this case since this is costly and would be done
// for any file that is new as well.
}
return predecessor;
}
/*
* Find the given revision in the list of log entries.
* Return null if the revision wasn't found.
*/
ICVSRemoteFile findRevison(ILogEntry[] allLogs, String predecessorRevision) throws TeamException {
for (int i = 0; i < allLogs.length; i++) {
ILogEntry entry = allLogs[i];
ICVSRemoteFile file = entry.getRemoteFile();
if (file.getRevision().equals(predecessorRevision)) {
return file;
}
}
return null;
}
/*
* Decrement the trailing digit by one.
*/
String getPredecessorRevision(String revision) {
int digits[] = Util.convertToDigits(revision);
digits[digits.length - 1]--;
StringBuffer buffer = new StringBuffer(revision.length());
for (int i = 0; i < digits.length; i++) {
buffer.append(Integer.toString(digits[i]));
if (i < digits.length - 1) {
buffer.append('.');
}
}
return buffer.toString();
}
/*
* Return true if there are more than 2 digits in the revision number
* (i.e. the revision is on a branch)
*/
boolean isBrancheRevision(String revision) {
return Util.convertToDigits(revision).length > 2;
}
/*
* Remove the trailing revision digits such that the
* returned revision is shorter than the given revision
* and is an even number of digits long
*/
String getBaseRevision(String revision) {
int digits[] = Util.convertToDigits(revision);
int length = digits.length - 1;
if (length % 2 == 1) {
length--;
}
StringBuffer buffer = new StringBuffer(revision.length());
for (int i = 0; i < length; i++) {
buffer.append(Integer.toString(digits[i]));
if (i < length - 1) {
buffer.append('.');
}
}
return buffer.toString();
}
/**
* Remove any entries for the remote resources
* @param resource the remote resource
*/
public synchronized void clearEntries(ICVSRemoteResource resource) {
String remotePath = getFullPath(resource);
entries.remove(remotePath);
}
@Override
public void handleLogEntryReceived(ILogEntry entry) {
ICVSRemoteFile file = entry.getRemoteFile();
String fullPath = getFullPath(file);
String revision = entry.getRevision();
Map fileEntries = internalGetLogEntries(fullPath);
if (fileEntries == null) {
fileEntries = new HashMap();
entries.put(fullPath, fileEntries);
}
fileEntries.put(revision, entry);
}
}
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