/*

  * Copyright 2004-2008 the Seasar Foundation and the Others.

  *

  * Licensed under the Apache License, Version 2.0 (the "License");

  * you may not use this file except in compliance with the License.

  * You may obtain a copy of the License at

  *

  *     http://www.apache.org/licenses/LICENSE-2.0

  *

  * Unless required by applicable law or agreed to in writing, software

  * distributed under the License is distributed on an "AS IS" BASIS,

  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, 

  * either express or implied. See the License for the specific language

  * governing permissions and limitations under the License.

  */

 package org.seasar.uruma.component;

 import org.seasar.framework.util.StringUtil;

 import org.seasar.uruma.binding.enables.EnablesDependingDef;

 import org.seasar.uruma.binding.enables.EnablesForType;

 import org.seasar.uruma.context.WidgetHandle;

 import org.seasar.uruma.context.WindowContext;

 import org.seasar.uruma.core.UrumaMessageCodes;

 import org.seasar.uruma.exception.NotFoundException;

 /**

  * コンポーネントツリーを走査して、 {@link EnablesDependable} の登録を行うための {@link UIElementVisitor}

  * です。<br />

  * 

  * @author y-komori

  */

 public class EnablesDependableVisitor implements UIElementVisitor,

         UrumaMessageCodes {

     private WindowContext context;

     /**

      * {@link EnablesDependableVisitor} を構築します。<br />

      * 

      * @param context

      */

     public EnablesDependableVisitor(final WindowContext context) {

         this.context = context;

     }

     /*

      * @see org.seasar.uruma.component.UIElementVisitor#visit(org.seasar.uruma.component.UIElement)

      */

     public void visit(final UIElement element) {

         if ((element instanceof UIComponent)

                 && (element instanceof EnablesDependable)) {

             EnablesDependable dependable = (EnablesDependable) element;

             String id = ((UIComponent) element).getId();

             if (id != null) {

                 String enablesDependingId = dependable.getEnablesDependingId();

                 String enablesForType = dependable.getEnablesFor();

                 if (!StringUtil.isEmpty(enablesDependingId)) {

                     EnablesForType type = EnablesForType.SELECTION;

                     if (!StringUtil.isEmpty(enablesForType)) {

                         type = EnablesForType.valueOf(enablesForType);

                     }

                     WidgetHandle handle = context.getWidgetHandle(id);

                     if (handle != null) {

                         EnablesDependingDef def = new EnablesDependingDef(

                                 handle, enablesDependingId, type);

                         context.addEnablesDependingDef(def);

                     } else {

                         throw new NotFoundException(UICOMPONENT_NOT_FOUND, id);

                     }

                 }

             }

         }

     }

     /*

      * @see org.seasar.uruma.component.UIElementVisitor#visit(org.seasar.uruma.component.UIElementContainer)

      */

     public void visit(final UIElementContainer container) {

         for (UIElement element : container.getChildren()) {

             element.accept(this);

         }

     }

     /*

      * @see org.seasar.uruma.component.UIElementVisitor#visit(org.seasar.uruma.component.Template)

      */

     public void visit(final Template template) {

         // Do nothing.

     }

 }