/**
* Loads the plugins contained within the specified directory
*
* @param directory Directory to check for plugins
* @return A list of all plugins loaded
*/
public Plugin[] loadPlugins(File directory) {
Validate.notNull(directory, "Directory cannot be null");
Validate.isTrue(directory.isDirectory(), "Directory must be a directory");
List<Plugin> result = new ArrayList<Plugin>();
Set<Pattern> filters = fileAssociations.keySet();
if (!(server.getUpdateFolder().equals(""))) {
updateDirectory = new File(directory, server.getUpdateFolder());
}
Map<String, File> plugins = new HashMap<String, File>();
Set<String> loadedPlugins = new HashSet<String>();
Map<String, Collection<String>> dependencies = new HashMap<String, Collection<String>>();
Map<String, Collection<String>> softDependencies = new HashMap<String, Collection<String>>();
// This is where it figures out all possible plugins
for (File file : directory.listFiles()) {
PluginLoader loader = null;
for (Pattern filter : filters) {
Matcher match = filter.matcher(file.getName());
if (match.find()) {
loader = fileAssociations.get(filter);
}
}
if (loader == null) continue;
PluginDescriptionFile description = null;
try {
description = loader.getPluginDescription(file);
} catch (InvalidDescriptionException ex) {
server
.getLogger()
.log(
Level.SEVERE,
"Could not load '" + file.getPath() + "' in folder '" + directory.getPath() + "'",
ex);
continue;
}
plugins.put(description.getName(), file);
Collection<String> softDependencySet = description.getSoftDepend();
if (softDependencySet != null) {
if (softDependencies.containsKey(description.getName())) {
// Duplicates do not matter, they will be removed together if applicable
softDependencies.get(description.getName()).addAll(softDependencySet);
} else {
softDependencies.put(description.getName(), new LinkedList<String>(softDependencySet));
}
}
Collection<String> dependencySet = description.getDepend();
if (dependencySet != null) {
dependencies.put(description.getName(), new LinkedList<String>(dependencySet));
}
Collection<String> loadBeforeSet = description.getLoadBefore();
if (loadBeforeSet != null) {
for (String loadBeforeTarget : loadBeforeSet) {
if (softDependencies.containsKey(loadBeforeTarget)) {
softDependencies.get(loadBeforeTarget).add(description.getName());
} else {
// softDependencies is never iterated, so 'ghost' plugins aren't an issue
Collection<String> shortSoftDependency = new LinkedList<String>();
shortSoftDependency.add(description.getName());
softDependencies.put(loadBeforeTarget, shortSoftDependency);
}
}
}
}
while (!plugins.isEmpty()) {
boolean missingDependency = true;
Iterator<String> pluginIterator = plugins.keySet().iterator();
while (pluginIterator.hasNext()) {
String plugin = pluginIterator.next();
if (dependencies.containsKey(plugin)) {
Iterator<String> dependencyIterator = dependencies.get(plugin).iterator();
while (dependencyIterator.hasNext()) {
String dependency = dependencyIterator.next();
// Dependency loaded
if (loadedPlugins.contains(dependency)) {
dependencyIterator.remove();
// We have a dependency not found
} else if (!plugins.containsKey(dependency)) {
missingDependency = false;
File file = plugins.get(plugin);
pluginIterator.remove();
softDependencies.remove(plugin);
dependencies.remove(plugin);
server
.getLogger()
.log(
Level.SEVERE,
"Could not load '"
+ file.getPath()
+ "' in folder '"
+ directory.getPath()
+ "'",
new UnknownDependencyException(dependency));
break;
}
}
if (dependencies.containsKey(plugin) && dependencies.get(plugin).isEmpty()) {
dependencies.remove(plugin);
}
}
if (softDependencies.containsKey(plugin)) {
Iterator<String> softDependencyIterator = softDependencies.get(plugin).iterator();
while (softDependencyIterator.hasNext()) {
String softDependency = softDependencyIterator.next();
// Soft depend is no longer around
if (!plugins.containsKey(softDependency)) {
softDependencyIterator.remove();
}
}
if (softDependencies.get(plugin).isEmpty()) {
softDependencies.remove(plugin);
}
}
if (!(dependencies.containsKey(plugin) || softDependencies.containsKey(plugin))
&& plugins.containsKey(plugin)) {
// We're clear to load, no more soft or hard dependencies left
File file = plugins.get(plugin);
pluginIterator.remove();
missingDependency = false;
try {
result.add(loadPlugin(file));
loadedPlugins.add(plugin);
continue;
} catch (InvalidPluginException ex) {
server
.getLogger()
.log(
Level.SEVERE,
"Could not load '"
+ file.getPath()
+ "' in folder '"
+ directory.getPath()
+ "'",
ex);
}
}
}
if (missingDependency) {
// We now iterate over plugins until something loads
// This loop will ignore soft dependencies
pluginIterator = plugins.keySet().iterator();
while (pluginIterator.hasNext()) {
String plugin = pluginIterator.next();
if (!dependencies.containsKey(plugin)) {
softDependencies.remove(plugin);
missingDependency = false;
File file = plugins.get(plugin);
pluginIterator.remove();
try {
result.add(loadPlugin(file));
loadedPlugins.add(plugin);
break;
} catch (InvalidPluginException ex) {
server
.getLogger()
.log(
Level.SEVERE,
"Could not load '"
+ file.getPath()
+ "' in folder '"
+ directory.getPath()
+ "'",
ex);
}
}
}
// We have no plugins left without a depend
if (missingDependency) {
softDependencies.clear();
dependencies.clear();
Iterator<File> failedPluginIterator = plugins.values().iterator();
while (failedPluginIterator.hasNext()) {
File file = failedPluginIterator.next();
failedPluginIterator.remove();
server
.getLogger()
.log(
Level.SEVERE,
"Could not load '"
+ file.getPath()
+ "' in folder '"
+ directory.getPath()
+ "': circular dependency detected");
}
}
}
}
return result.toArray(new Plugin[result.size()]);
}
@Override
public String getUpdateFolder() {
return server.getUpdateFolder();
}
