uicomponenttag.java

RESIN 3.2 最新源码

/*
 * Copyright (c) 1998-2008 Caucho Technology -- all rights reserved
 *
 * This file is part of Resin(R) Open Source
 *
 * Each copy or derived work must preserve the copyright notice and this
 * notice unmodified.
 *
 * Resin Open Source is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2
 * as published by the Free Software Foundation.
 *
 * Resin Open Source is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
 * of NON-INFRINGEMENT.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Resin Open Source; if not, write to the
 *
 *   Free Software Foundation, Inc.
 *   59 Temple Place, Suite 330
 *   Boston, MA 02111-1307  USA
 *
 * @author Scott Ferguson
 */

package javax.faces.webapp;

import java.io.*;
import java.util.*;

import javax.el.*;

import javax.faces.*;
import javax.faces.application.*;
import javax.faces.component.*;
import javax.faces.context.*;
import javax.faces.el.*;
import javax.faces.event.*;
import javax.faces.render.*;

import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;

public abstract class UIComponentTag extends UIComponentClassicTagBase
  implements Tag
{
  private ValueExpression _binding;
  private ValueExpression _rendered;

  public void setBinding(String binding)
    throws JspException
  {
    FacesContext context = FacesContext.getCurrentInstance();

    Application app = context.getApplication();
    ExpressionFactory factory = app.getExpressionFactory();

    _binding = factory.createValueExpression(context.getELContext(),
					     binding,
					     UIComponent.class);
  }

  public boolean hasBinding()
  {
    return _binding != null;
  }

  public void setRendered(String rendered)
    throws JspException
  {
    FacesContext context = FacesContext.getCurrentInstance();

    Application app = context.getApplication();
    ExpressionFactory factory = app.getExpressionFactory();

    _rendered = factory.createValueExpression(context.getELContext(),
					     rendered,
					     boolean.class);
  }

  public boolean isSuppressed()
  {
    return false;
  }

  protected void setProperties(UIComponent component)
  {
    if (_rendered != null)
      component.setValueExpression("rendered", _rendered);

    String type = getRendererType();
    if (type != null)
      component.setRendererType(type);
  }

  protected UIComponent createComponent(FacesContext context,
					String newId)
  {
    Application app = context.getApplication();

    UIComponent component;

    if (_binding != null) {
      component = app.createComponent(_binding, context, getComponentType());
      component.setValueExpression("binding", _binding);
    }
    else
      component = app.createComponent(getComponentType());

    component.setId(getId());
    
    setProperties(component);

    return component;
  }

  public static UIComponentTag getParentUIComponentTag(PageContext context)
  {
    UIComponentClassicTagBase parent;
    
    parent = getParentUIComponentClassicTagBase(context);

    return (UIComponentTag) parent;
  }

  public static boolean isValueReference(String value)
  {
    return value.startsWith("#{") && value.endsWith("}");
  }
}