New UI for Find command: find-as-you-type.

editor/tools/plugins/com.xored.glance.ui/src/com/xored/glance/internal/ui/sources/TextSourceManager.java

+/**
+ * 
+ */
+package com.xored.glance.internal.ui.sources;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.eclipse.core.runtime.IConfigurationElement;
+import org.eclipse.core.runtime.Platform;
+
+import com.xored.glance.internal.ui.GlancePlugin;
+import com.xored.glance.ui.sources.ITextSourceDescriptor;
+
+/**
+ * @author Yuri Strot
+ */
+public class TextSourceManager {
+
+  public static TextSourceManager getInstance() {
+    if (instance == null)
+      instance = new TextSourceManager();
+    return instance;
+  }
+
+  public void addSourceProviderListener(ISourceProviderListener listener) {
+    assert listener != null;
+    getListener().addSourceProviderListener(listener);
+  }
+
+  public void removeSourceProviderListener(ISourceProviderListener listener) {
+    getListener().removeSourceProviderListener(listener);
+  }
+
+  public TextSourceMaker getSource() {
+    return getListener().getSelection();
+  }
+
+  private TextSourceListener getListener() {
+    if (listener == null) {
+      listener = new TextSourceListener(getDescriptors());
+    }
+    return listener;
+  }
+
+  private ITextSourceDescriptor[] getDescriptors() {
+    if (descriptors == null) {
+
+      List<Class<?>> excludedClasses = new ArrayList<Class<?>>();
+
+      IConfigurationElement[] excludedConfigs = Platform.getExtensionRegistry().getConfigurationElementsFor(
+          EXT_EXCLUDED_SOURCES);
+
+      for (IConfigurationElement config : excludedConfigs) {
+        try {
+          ITextSourceDescriptor descriptor = (ITextSourceDescriptor) config.createExecutableExtension(ATTR_CLASS);
+          excludedClasses.add(descriptor.getClass());
+        } catch (Exception e) {
+          GlancePlugin.log(e);
+        }
+      }
+
+      IConfigurationElement[] configs = Platform.getExtensionRegistry().getConfigurationElementsFor(
+          EXT_SOURCES);
+      List<ITextSourceDescriptor> list = new ArrayList<ITextSourceDescriptor>();
+      final Map<ITextSourceDescriptor, Integer> prior = new HashMap<ITextSourceDescriptor, Integer>();
+
+      for (IConfigurationElement config : configs) {
+        try {
+          ITextSourceDescriptor descriptor = (ITextSourceDescriptor) config.createExecutableExtension(ATTR_CLASS);
+          if (excludedClasses.contains(descriptor.getClass())) {
+            continue;
+          }
+          int priority = toInt(config.getAttribute(ATTR_PRIORITY));
+          list.add(descriptor);
+          prior.put(descriptor, priority);
+        } catch (Exception e) {
+          GlancePlugin.log(e);
+        }
+      }
+
+      Collections.sort(list, new Comparator<ITextSourceDescriptor>() {
+
+        public int compare(ITextSourceDescriptor o1, ITextSourceDescriptor o2) {
+          return prior.get(o2) - prior.get(o1);
+        }
+
+      });
+      descriptors = list.toArray(new ITextSourceDescriptor[list.size()]);
+    }
+    return descriptors;
+  }
+
+  private int toInt(String priority) {
+    try {
+      if (priority == null || priority.length() == 0)
+        return 1;
+      return Integer.parseInt(priority);
+    } catch (Exception e) {
+      GlancePlugin.log(e);
+    }
+    return 1;
+  }
+
+  private TextSourceManager() {
+  }
+
+  private final static String ATTR_PRIORITY = "priority";
+  private final static String ATTR_CLASS = "class";
+  private final static String EXT_SOURCES = GlancePlugin.PLUGIN_ID + ".sources";
+  private final static String EXT_EXCLUDED_SOURCES = GlancePlugin.PLUGIN_ID + ".excludedSources";
+
+  private static TextSourceManager instance;
+
+  private TextSourceListener listener;
+  private ITextSourceDescriptor[] descriptors;
+
+}