componenteditorhandler.java

adf-faces 甲骨文的jsf组件,功能很强.开源免费.

package oracle.adfdemo.view.faces;

import java.beans.BeanInfo;
import java.beans.Introspector;
import java.beans.PropertyDescriptor;

import java.lang.reflect.Method;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Date;
import java.util.Iterator;
import java.util.List;

import javax.faces.component.UIComponent;

public class ComponentEditorHandler
{
  public String update()
  {
    List list = _list;
    if (list != null)
    {
      Iterator iter = list.iterator();
      while (iter.hasNext())
      {
        ((PropertyOfComponent) (iter.next())).flushToComponent();
      }
    }

    return null;
  }

  public void setComponent(UIComponent component)
  {
    _editedComponent = component;
  }

  public UIComponent getComponent()
  {
    return _editedComponent;
  }

  public boolean isJavascriptShown()
  {
    return _javascriptShown;
  }

  public void setJavascriptShown(boolean javascriptShown)
  {
    _javascriptShown = javascriptShown;
  }

  public List getAttributes()
  {
    if (_list != null)
      return _list;

    UIComponent comp = getComponent();
    if (comp == null)
      return null;

    List list = new ArrayList();
    try
    {
      BeanInfo beanInfo = Introspector.getBeanInfo(comp.getClass());
      PropertyDescriptor[] descriptors = beanInfo.getPropertyDescriptors();
      for (int i = 0; i < descriptors.length; i++)
      {
        PropertyDescriptor descriptor = descriptors[i];
        // "Write-only" properties - no go
        if (descriptor.getReadMethod() == null)
          continue;

        PropertyOfComponent poc = null;

        boolean readOnly = descriptor.getWriteMethod() == null;
        if (readOnly)
          continue;

        // For now, skip any attributes with ValueBindings
        String name = descriptor.getName();
        if (comp.getValueBinding(name) != null)
          continue;
                        

        Class type = descriptor.getPropertyType();
        if ((type == String.class) ||
            (type == Object.class))
        {
          if (!isJavascriptShown() &&
              name.startsWith("on"))
            continue;

          poc = new StringProperty(comp, descriptor);
        }
        else if ((type == Integer.class) ||
                 (type == Integer.TYPE))
        {
          poc = new IntegerProperty(comp, descriptor);
        }
        else if ((type == Boolean.class) ||
                 (type == Boolean.TYPE))
        {
          poc = new BooleanProperty(comp, descriptor);
        }
        else if (type == Date.class)
        {
          poc = new DateProperty(comp, descriptor);
        }

        if (poc != null)
          list.add(poc);
      }

      // Sort the list by property name
      Collections.sort(list);

      _list = list;

      return list;
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }

    return null;
  }

  static public class PropertyOfComponent implements Comparable
  {
    public PropertyOfComponent(UIComponent component,
                               PropertyDescriptor descriptor)
    {
      _component = component;
      _descriptor = descriptor;
    }

    // Sort by the name of the property
    public int compareTo(Object o)
    {
      PropertyOfComponent poc = (PropertyOfComponent) o;
      return getName().compareTo(poc.getName());
    }

    public String getName()
    {
      return _descriptor.getName();
    }

    public String getType()
    {
      return null;
    }

    public void flushToComponent()
    {
      if (_valueSet)
        _component.getAttributes().put(getName(), _value);
    }

    protected Object getBeanProperty()
    {
      Method method = _descriptor.getReadMethod();
      try
      {
        return method.invoke(_component, null);
      }
      catch (Exception e)
      {
        e.printStackTrace();
      }

      return getProperty();
    }


    protected Object getProperty()
    {
      return _component.getAttributes().get(getName());
    }

    protected void setProperty(Object value)
    {
      if ("".equals(value))
        value = null;

      _valueSet = true;
      _value = value;
    }

    private boolean _valueSet = false;
    private Object  _value    = null;
    private final PropertyDescriptor _descriptor;
    private final UIComponent        _component;
  }

  static public class IntegerProperty extends PropertyOfComponent
  {
    public IntegerProperty(UIComponent component, PropertyDescriptor descriptor)
    {
      super(component, descriptor);
    }

    public Integer getValue()
    {
      return (Integer) getProperty();
    }

    public void setValue(Integer i)
    {
      setProperty(i);
    }

    public String getType()
    {
      return "integer";
    }
  }


  static public class DateProperty extends PropertyOfComponent
  {
    public DateProperty(UIComponent component, PropertyDescriptor descriptor)
    {
      super(component, descriptor);
    }

    public Date getValue()
    {
      return (Date) getProperty();
    }

    public void setValue(Date i)
    {
      setProperty(i);
    }

    public String getType()
    {
      return "date";
    }
  }


  static public class StringProperty extends PropertyOfComponent
  {
    public StringProperty(UIComponent component, PropertyDescriptor descriptor)
    {
      super(component, descriptor);
    }

    public String getValue()
    {
      Object o = getProperty();
      if (o == null)
        return null;
      return o.toString();
    }

    public void setValue(String s)
    {
      setProperty(s);
    }

    public String getType()
    {
      return "string";
    }
  }



  static public class BooleanProperty extends PropertyOfComponent
  {
    public BooleanProperty(UIComponent component, PropertyDescriptor descriptor)
    {
      super(component, descriptor);
    }

    public Boolean getValue()
    {
      return (Boolean) getBeanProperty();
    }

    public void setValue(Boolean b)
    {
      setProperty(b);
    }

    public String getType()
    {
      return "boolean";
    }
  }


  private UIComponent _editedComponent;
  private boolean     _javascriptShown = true;
  private List        _list;
}