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//--------------------------------------------------------------------------
//	Copyright (c) 1998-2004, Drew Davidson and Luke Blanshard
//  All rights reserved.
//
//	Redistribution and use in source and binary forms, with or without
//  modification, are permitted provided that the following conditions are
//  met:
//
//	Redistributions of source code must retain the above copyright notice,
//  this list of conditions and the following disclaimer.
//	Redistributions in binary form must reproduce the above copyright
//  notice, this list of conditions and the following disclaimer in the
//  documentation and/or other materials provided with the distribution.
//	Neither the name of the Drew Davidson nor the names of its contributors
//  may be used to endorse or promote products derived from this software
//  without specific prior written permission.
//
//	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
//  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
//  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
//  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
//  COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
//  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
//  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
//  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
//  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
//  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
//  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
//  DAMAGE.
//--------------------------------------------------------------------------
package org.apache.ibatis.ognl;

import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

/**
 * @author Luke Blanshard ([email protected])
 * @author Drew Davidson ([email protected])
 */
class ASTStaticField extends SimpleNode {
  private String className;
  private String fieldName;

  public ASTStaticField(int id) {
    super(id);
  }

  public ASTStaticField(OgnlParser p, int id) {
    super(p, id);
  }

  /**
   * Called from parser action.
   */
  void init(String className, String fieldName) {
    this.className = className;
    this.fieldName = fieldName;
  }

  protected Object getValueBody(OgnlContext context, Object source) throws OgnlException {
    return OgnlRuntime.getStaticField(context, className, fieldName);
  }

  public boolean isNodeConstant(OgnlContext context) throws OgnlException {
    boolean result = false;
    Exception reason = null;

    try {
      Class c = OgnlRuntime.classForName(context, className);

      /*
          Check for virtual static field "class"; this cannot interfere with
          normal static fields because it is a reserved word.  It is considered
          constant.
      */
      if (fieldName.equals("class")) {
        result = true;
      } else {
        Field f = c.getField(fieldName);

        if (!Modifier.isStatic(f.getModifiers())) {
          throw new OgnlException("Field " + fieldName + " of class " + className + " is not static");
        }
        result = Modifier.isFinal(f.getModifiers());
      }
    } catch (ClassNotFoundException e) {
      reason = e;
    }
    catch (NoSuchFieldException e) {
      reason = e;
    }
    catch (SecurityException e) {
      reason = e;
    }

    if (reason != null) {
      throw new OgnlException("Could not get static field " + fieldName + " from class " + className, reason);
    }
    return result;
  }

  public String toString() {
    return "@" + className + "@" + fieldName;
  }
}