SimpleMapper.java :  » Ajax » zk » org » zkoss » xel » util » Java Open Source

/* SimpleMapper.java

  Purpose:
    
  Description:
    
  History:
    Tue Sep  4 23:09:16     2007, Created by tomyeh

Copyright (C) 2007 Potix Corporation. All Rights Reserved.

{{IS_RIGHT
  This program is distributed under LGPL Version 3.0 in the hope that
  it will be useful, but WITHOUT ANY WARRANTY.
}}IS_RIGHT
*/
package org.zkoss.xel.util;

import java.util.Collection;

import org.zkoss.util.DualCollection;
import org.zkoss.xel.Function;
import org.zkoss.xel.FunctionMapper;

/**
 * A simmple function mapper.
 *
 * @author tomyeh
 * @since 3.0.0
 */
public class SimpleMapper extends TaglibMapper {
  private FunctionMapper _parent;
  public SimpleMapper() {
  }
  public SimpleMapper(FunctionMapper parent) {
    _parent = parent;
  }

  /** Returns the parent mapper, or null if no parent.
   */
  public FunctionMapper getParent() {
    return _parent;
  }
  /** Sets the parent mapper.
   *
   * @param parent the parent mapper, or null if no parent.
   */
  public void setParent(FunctionMapper parent) {
    _parent = parent;
  }

  //-- FunctionMapper --//
  public Function resolveFunction(String prefix, String name) {
    Function m = super.resolveFunction(prefix, name);
    return m != null ? m:
      _parent != null ? _parent.resolveFunction(prefix, name): null;
  }
  public Collection getClassNames() {
    return combine(super.getClassNames(),
      _parent != null ? _parent.getClassNames(): null);
  }
  public Class resolveClass(String name) {
    Class m = super.resolveClass(name);
    return m != null ? m:
      _parent != null ? _parent.resolveClass(name): null;
  }
  private static Collection combine(Collection first, Collection second) {
    return DualCollection.combine(
      first != null && !first.isEmpty() ? first: null,
      second != null && !second.isEmpty() ? second: null);
  }
}