[Bleeding] Added loadbefore property; Addresses BUKKIT-843

By: Wesley Wolfe <weswolf@aol.com>

paper-api/src/main/java/org/bukkit/plugin/PluginDescriptionFile.java

@@ -25,6 +25,7 @@ public final class PluginDescriptionFile {
     private String classLoaderOf = null;
     private List<String> depend = null;
     private List<String> softDepend = null;
+    private List<String> loadBefore = null;
     private String version = null;
     private Map<String, Map<String, Object>> commands = null;
     private String description = null;
@@ -121,6 +122,14 @@ public final class PluginDescriptionFile {
         return softDepend;
     }
 
+    /**
+     * Gets the list of plugins that should consider this plugin a soft-dependency
+     * @return immutable list of plugins that should consider this plugin a soft-dependency
+     */
+    public List<String> getLoadBefore() {
+        return softDepend;
+    }
+
     public PluginLoadOrder getLoad() {
         return order;
     }
@@ -267,6 +276,20 @@ public final class PluginDescriptionFile {
             softDepend = softDependBuilder.build();
         }
 
+        if (map.get("loadbefore") != null) {
+            ImmutableList.Builder<String> loadBeforeBuilder = ImmutableList.<String>builder();
+            try {
+                for (Object predependency : (Iterable<?>) map.get("loadbefore")) {
+                    loadBeforeBuilder.add(predependency.toString());
+                }
+            } catch (ClassCastException ex) {
+                throw new InvalidDescriptionException(ex, "loadbefore is of wrong type");
+            } catch (NullPointerException ex) {
+                throw new InvalidDescriptionException(ex, "invalid load-before format");
+            }
+            loadBefore = loadBeforeBuilder.build();
+        }
+
         if (map.get("database") != null) {
             try {
                 database = (Boolean) map.get("database");

paper-api/src/main/java/org/bukkit/plugin/SimplePluginManager.java

@@ -139,13 +139,32 @@ public final class SimplePluginManager implements PluginManager {
 
             Collection<String> softDependencySet = description.getSoftDepend();
             if (softDependencySet != null) {
-                softDependencies.put(description.getName(), new LinkedList<String>(softDependencySet));
+                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()) {
@@ -227,7 +246,6 @@ public final class SimplePluginManager implements PluginManager {
 
                     if (!dependencies.containsKey(plugin)) {
                         softDependencies.remove(plugin);
-                        dependencies.remove(plugin);
                         missingDependency = false;
                         File file = plugins.get(plugin);
                         pluginIterator.remove();