querysegment.java

webwork source

/*
 * WebWork, Web Application Framework
 *
 * Distributable under Apache license.
 * See terms of license at opensource.org
 */
package webwork.util;

import java.util.ArrayList;
import java.util.List;

/**
 *	A segment of a ValueStack Query.
 *      
 * @author Maurice C. Parker ([e-mail])
 *	@version $Revision: 1.10 $
 */
public class QuerySegment
{
   // Attributes ----------------------------------------------------
   public final static int STRING = 0;
   public final static int TRUE = 1;
   public final static int FALSE = 2;
   public final static int CURRENT = 3;
   public final static int PARENT = 4;
   public final static int ROOT = 5;
   public final static int ATTRIBUTE = 6;
   public final static int PARAMETER = 7;
   public final static int PROPERTY = 8;
   public final static int COLLECTION = 9;
   public final static int METHOD = 10;
   public final static int EXPAND = 11;
   public final static int NUMBER = 12;
   public final static int NULL = 13;

   private Query query;
   private String id;
   private int type;
   private List values;

	// Public --------------------------------------------------------
   public QuerySegment(int type)
   {
      this.type = type;
   }

   public QuerySegment(String id, int type)
   {
      this.id = id;
      this.type = type;
   }
   
   public QuerySegment(String id, Query query, int type)
   {
      this.id = id;
      this.query = query;
      this.type = type;
   }

   /**
    * Add a value that is associated with this QuerySegment.
    */
   public void addValue(Object value)
   {
      if ( values == null )
         values = new ArrayList();

      values.add(value);
   }
   
   public void createValues()
   {
   	values = new ArrayList();
   }

   /**
    * Return the identification string.
    */
   public String getId()
   {
      return id;
   }

   public Query getQuery()
   {
      return query;
   }
	
   /**
    * Return this QuerySegments type.  The type is used to identify
    * if this QuerySegment will be used to access an object property,
    * an object method, or a Collection.
    */
   public int getType()
   {
      return type;
   }

   /**
    * Returns a list of values for this QuerySegment.
    */
   public List getValues()
   {
      return values;
   }

   public String toString() {
      StringBuffer sb = new StringBuffer();
      sb.append("\"");
      if (values!=null) {
         for(int i=0; i<values.size(); i++) {
            sb.append(values.get(i));
            if ((i + 1) < values.size()) {
               sb.append(",");
            }
         }
      }
      sb.append("\"");
      return "[id=\"" + id + "\" type=\"" + type + "\" values=" + sb.toString() + "]";
   }

}