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1   /*
2    * Copyright 2004-2008 the Seasar Foundation and the Others.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *     http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, 
13   * either express or implied. See the License for the specific language
14   * governing permissions and limitations under the License.
15   */
16  package org.seasar.uruma.component.base;
17  
18  import java.util.ArrayList;
19  import java.util.List;
20  
21  import org.seasar.uruma.component.UIComponent;
22  import org.seasar.uruma.component.UIComponentContainer;
23  import org.seasar.uruma.component.UIElement;
24  import org.seasar.uruma.context.PartContext;
25  import org.seasar.uruma.context.WidgetHandle;
26  
27  /**
28   * {@link UIComponentContainer} の子要素を表す基底クラスです。<br />
29   * 
30   * @author bskuroneko
31   */
32  public abstract class AbstractUIContainerItemComponent extends
33          AbstractItemComponent implements UIComponentContainer {
34  
35      private List<UIElement> children = new ArrayList<UIElement>();
36  
37      /*
38       * @see org.seasar.uruma.component.UIElementContainer#addChild(org.seasar.uruma.component.UIElement)
39       */
40      public void addChild(final UIElement child) {
41          children.add(child);
42          if (child instanceof UIComponent) {
43              ((UIComponent) child).setParent(getParent());
44          }
45      }
46  
47      /*
48       * @see org.seasar.uruma.component.UIElementContainer#getChildren()
49       */
50      public List<UIElement> getChildren() {
51          return children;
52      }
53  
54      /**
55       * 子コンポーネントを取得します。<br />
56       * 子コンポーネントが複数存在する場合、最初の一個を返します。
57       * 
58       * @return 子コンポーネント。存在しない場合は <code>null</code>。
59       */
60      public UIElement getChild() {
61          if (children.size() > 0) {
62              return children.get(0);
63          } else {
64              return null;
65          }
66      }
67  
68      /*
69       * @see org.seasar.uruma.component.jface.AbstractUIComponent#doRender(org.seasar.uruma.context.WidgetHandle,
70       *      org.seasar.uruma.context.PartContext)
71       */
72      @Override
73      protected void doRender(final WidgetHandle parent, final PartContext context) {
74          UIElement content = getChild();
75          if ((content != null) && (content instanceof UIComponent)) {
76              WidgetHandle parentHandle = context.getWidgetHandle(getParent()
77                      .getId());
78              ((UIComponent) content).render(parentHandle, context);
79          }
80      }
81  }