objinfo.java

Bean Scripting Framework (BSF)为在java应用中使用脚本语言

/*
 * Copyright 2004,2004 The Apache Software Foundation.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.bsf.util;

/**
 * An <code>ObjInfo</code> object is used by a compiler to track the name and
 * type of a bean.
 * 
 * @author   Matthew J. Duftler
 */
public class ObjInfo
{
  static private String QUOTE_CHARS = "\'\"",
						EXEC_CHARS  = "(=";
		 public  String objName;
		 public  Class  objClass;

  public ObjInfo(Class objClass, String objName)
  {
	this.objClass = objClass;
	this.objName  = objName;
  }
  public boolean isExecutable()
  {
	char[]  chars            = objName.toCharArray();
	char    openingChar      = ' ';
	boolean inString         = false,
			inEscapeSequence = false;

	for (int i = 0; i < chars.length; i++)
	{
	  if (inEscapeSequence)
	  {
		inEscapeSequence = false;
	  }
	  else if (QUOTE_CHARS.indexOf(chars[i]) != -1)
	  {
		if (!inString)
		{
		  openingChar = chars[i];
		  inString = true;
		}
		else
		{
		  if (chars[i] == openingChar)
		  {
			inString = false;
		  }
		}
	  }
	  else if (EXEC_CHARS.indexOf(chars[i]) != -1)
	  {
		if (!inString)
		{
		  return true;
		}
	  }
	  else if (inString && chars[i] == '\\')
	  {
		inEscapeSequence = true;
	  }
	}

	return false;
  }
  public boolean isValueReturning()
  {
	return (objClass != void.class && objClass != Void.class);
  }
  public String toString()
  {
	return StringUtils.getClassName(objClass) + " " + objName;
  }
}