1 files changed, 85 insertions, 0 deletions
diff --git a/propertysheet/src/org/eclipse/wb/internal/core/model/property/category/PropertyCategoryProviders.java b/propertysheet/src/org/eclipse/wb/internal/core/model/property/category/PropertyCategoryProviders.java
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+++ b/propertysheet/src/org/eclipse/wb/internal/core/model/property/category/PropertyCategoryProviders.java
@@ -0,0 +1,85 @@
+/*******************************************************************************
+ * Copyright (c) 2011 Google, Inc.
+ * 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
+ *
+ * Contributors:
+ *    Google, Inc. - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.wb.internal.core.model.property.category;
+
+import org.eclipse.wb.internal.core.model.property.Property;
+import org.eclipse.wb.internal.core.model.property.PropertyManager;
+
+/**
+ * Factory for {@link PropertyCategoryProvider} instances.
+ * 
+ * @author scheglov_ke
+ * @coverage core.model.property
+ */
+public final class PropertyCategoryProviders {
+  ////////////////////////////////////////////////////////////////////////////
+  //
+  // Simple providers
+  //
+  ////////////////////////////////////////////////////////////////////////////
+  private static final PropertyCategoryProvider FROM_PROPERTY = new PropertyCategoryProvider() {
+    public PropertyCategory getCategory(Property property) {
+      return property.getCategory();
+    }
+  };
+
+  /**
+   * Returns result of {@link Property#getCategory()}, never <code>null</code>.
+   */
+  public static PropertyCategoryProvider fromProperty() {
+    return FROM_PROPERTY;
+  }
+
+  private static final PropertyCategoryProvider FORCED_BY_USER = new PropertyCategoryProvider() {
+    public PropertyCategory getCategory(Property property) {
+      return PropertyManager.getCategoryForced(property);
+    }
+  };
+
+  /**
+   * Returns category forced by user, may be <code>null</code>.
+   */
+  public static PropertyCategoryProvider forcedByUser() {
+    return FORCED_BY_USER;
+  }
+
+  ////////////////////////////////////////////////////////////////////////////
+  //
+  // Compound
+  //
+  ////////////////////////////////////////////////////////////////////////////
+  /**
+   * Returns first not <code>null</code> category returned by provider.
+   */
+  public static PropertyCategoryProvider combine(final PropertyCategoryProvider... providers) {
+    return new PropertyCategoryProvider() {
+      public PropertyCategory getCategory(Property property) {
+        for (PropertyCategoryProvider provider : providers) {
+          PropertyCategory category = provider.getCategory(property);
+          if (category != null) {
+            return category;
+          }
+        }
+        throw new IllegalStateException("Can not provide category for " + property.getTitle());
+      }
+    };
+  }
+
+  private static final PropertyCategoryProvider DEF = combine(forcedByUser(), fromProperty());
+
+  /**
+   * Returns the default combination of {@link PropertyCategoryProvider}s - first
+   * {@link #forcedByUser()}, then {@link #fromProperty()}.
+   */
+  public static PropertyCategoryProvider def() {
+    return DEF;
+  }
+}