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/*******************************************************************************
* Copyright (C) 2011, 2013 Dariusz Luksza <dariusz@luksza.org> and others.
*
* 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.core.synchronize;
import java.util.Collection;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import org.eclipse.egit.core.internal.CoreText;
import org.eclipse.egit.core.synchronize.ThreeWayDiffEntry.ChangeType;
import org.eclipse.osgi.util.NLS;
/**
* Thin cache object. It contains list of object members, object name and
* {@link ThreeWayDiffEntry} data.
*/
class GitSyncObjectCache {
private final String name;
private ThreeWayDiffEntry diffEntry;
private Map<String, GitSyncObjectCache> members;
/**
* Creates node and leaf element
*
* @param name
* entry name
* @param diffEntry
* entry meta data
*/
GitSyncObjectCache(String name, ThreeWayDiffEntry diffEntry) {
this.name = name;
this.diffEntry = diffEntry;
}
/**
* @return name of this object
*/
public String getName() {
return name;
}
/**
*
* @return entry meta data
*/
public ThreeWayDiffEntry getDiffEntry() {
return diffEntry;
}
/**
* Store given {@code entry} in cache. It assumes that parent of
* {@code entry} is already in cache, if not {@link RuntimeException} will
* be thrown.
*
* @param entry
* that should be stored in cache
* @throws RuntimeException
* when cannot find parent of given {@code entry} in cache
*/
public void addMember(ThreeWayDiffEntry entry) {
String memberPath = entry.getPath();
if (members == null)
members = new HashMap<String, GitSyncObjectCache>();
int start = -1;
Map<String, GitSyncObjectCache> parent = members;
int separatorIdx = memberPath.indexOf("/"); //$NON-NLS-1$
while (separatorIdx > 0) {
String key = memberPath.substring(start + 1, separatorIdx);
GitSyncObjectCache cacheObject = parent.get(key);
if (cacheObject == null)
throw new RuntimeException(NLS.bind(
CoreText.GitSyncObjectCache_noData, key));
start = separatorIdx;
separatorIdx = memberPath.indexOf("/", separatorIdx + 1); //$NON-NLS-1$
if (cacheObject.members == null)
cacheObject.members = new HashMap<String, GitSyncObjectCache>();
parent = cacheObject.members;
}
String newName;
if (start > 0)
newName = memberPath.substring(start + 1);
else
newName = memberPath;
GitSyncObjectCache obj = new GitSyncObjectCache(newName, entry);
parent.put(newName, obj);
}
/**
* @param childPath
* repository relative path of entry that should be obtained
* @return cached object, or {@code null} when cache doen't contain object
* for given path
*/
public GitSyncObjectCache get(String childPath) {
if (childPath.length() == 0)
return this;
if (childPath
.substring(childPath.lastIndexOf("/") + 1, childPath.length()).equals(name)) //$NON-NLS-1$
return this;
if (members == null)
return null;
int start = -1;
Map<String, GitSyncObjectCache> parent = members;
int separatorIdx = childPath.indexOf("/"); //$NON-NLS-1$
while (separatorIdx > 0) {
String key = childPath.substring(start + 1, separatorIdx);
GitSyncObjectCache childObject = parent.get(key);
if (childObject == null)
return null;
start = separatorIdx;
separatorIdx = childPath.indexOf("/", separatorIdx + 1); //$NON-NLS-1$
parent = childObject.members;
if (parent == null)
return null;
}
return parent.get(childPath.subSequence(
childPath.lastIndexOf("/") + 1, childPath.length())); //$NON-NLS-1$
}
/**
* @return number of cached members
*/
public int membersCount() {
return members != null ? members.size() : 0;
}
/**
* @return list of all cached members or {@code null} when there this object
* doesn't contain members
*/
public Collection<GitSyncObjectCache> members() {
return members != null ? members.values() : null;
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
builder.append("entry: ").append(diffEntry).append("\n"); //$NON-NLS-1$ //$NON-NLS-2$
if (members != null) {
builder.append("members: "); //$NON-NLS-1$
for (GitSyncObjectCache obj : members.values())
builder.append(obj.toString()).append("\n"); //$NON-NLS-1$
}
return builder.toString();
}
void merge(GitSyncObjectCache other, Set<String> filterPaths) {
if (other.members != null) {
if (members == null)
members = new HashMap<String, GitSyncObjectCache>();
for (Entry<String, GitSyncObjectCache> entry : members.entrySet()) {
String key = entry.getKey();
if (!other.members.containsKey(key)) {
GitSyncObjectCache obj = entry.getValue();
String entryPath = obj.getDiffEntry().getPath();
if (containsPathOrParent(filterPaths, entryPath))
obj.getDiffEntry().changeType = ChangeType.IN_SYNC;
}
}
for (Entry<String, GitSyncObjectCache> entry : other.members
.entrySet()) {
String key = entry.getKey();
GitSyncObjectCache obj = entry.getValue();
if (members.containsKey(key)) {
members.get(key).merge(obj, filterPaths);
} else {
members.put(key, obj);
}
}
} else if (members != null) {
for (GitSyncObjectCache obj : members.values()) {
String entryPath = obj.getDiffEntry().getPath();
if (containsPathOrParent(filterPaths, entryPath))
obj.getDiffEntry().changeType = ChangeType.IN_SYNC;
}
} else {
// we are on a leaf entry, use the newer diff entry (need to update
// changeType, direction and other fields)
diffEntry = other.diffEntry;
}
}
private static boolean containsPathOrParent(Set<String> filterPaths,
String pathToTest) {
if (filterPaths.contains(pathToTest))
return true;
// "" is the root directory of the repository, so it matches everything
if (filterPaths.contains("")) //$NON-NLS-1$
return true;
String path = pathToTest;
int lastSlash = path.lastIndexOf('/');
while (lastSlash != -1) {
path = path.substring(0, lastSlash);
if (filterPaths.contains(path))
return true;
lastSlash = path.lastIndexOf('/');
}
return false;
}
}
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