/*
 * JBoss, the OpenSource J2EE webOS
 *
 * Distributable under LGPL license.
 * See terms of license at gnu.org.
 */

package org.jboss.ejb.plugins.cmp.ejbql;

import java.util.List;

import org.jboss.ejb.plugins.cmp.bridge.EntityBridge;
import org.jboss.ejb.plugins.cmp.bridge.FieldBridge;
import org.jboss.ejb.plugins.cmp.bridge.CMPFieldBridge;
import org.jboss.ejb.plugins.cmp.bridge.CMRFieldBridge;

/**
 * This abstract syntax node represents a path declaration.
 *
 * @author <a href="mailto:dain@daingroup.com">Dain Sundstrom</a>
 * @version $Revision: 1.4 $
 */
public final class ASTPath extends SimpleNode
{
   public List pathList;
   public List fieldList;
   public int type;

   public boolean innerJoin;

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

   public String getPath()
   {
      return (String) pathList.get(pathList.size() - 1);
   }

   public String getPath(int i)
   {
      return (String) pathList.get(i);
   }

   public FieldBridge getField()
   {
      return (FieldBridge) fieldList.get(fieldList.size() - 1);
   }

   public boolean isCMPField()
   {
      return fieldList.get(fieldList.size() - 1) instanceof CMPFieldBridge;
   }

   public CMPFieldBridge getCMPField()
   {
      return (CMPFieldBridge) fieldList.get(fieldList.size() - 1);
   }

   public boolean isCMRField()
   {
      return fieldList.get(fieldList.size() - 1) instanceof CMRFieldBridge;
   }

   public boolean isCMRField(int i)
   {
      return fieldList.get(i) instanceof CMRFieldBridge;
   }

   public CMRFieldBridge getCMRField()
   {
      return (CMRFieldBridge) fieldList.get(fieldList.size() - 1);
   }

   public CMRFieldBridge getCMRField(int i)
   {
      return (CMRFieldBridge) fieldList.get(i);
   }

   public EntityBridge getEntity()
   {
      Object field = fieldList.get(fieldList.size() - 1);
      if(field instanceof CMRFieldBridge)
      {
         return ((CMRFieldBridge) field).getRelatedEntity();
      }
      else if(field instanceof EntityBridge)
      {
         return (EntityBridge) field;
      }
      else
      {
         return null;
      }
   }

   public EntityBridge getEntity(int i)
   {
      Object field = fieldList.get(i);
      if(field instanceof CMRFieldBridge)
      {
         return ((CMRFieldBridge) field).getRelatedEntity();
      }
      else if(field instanceof EntityBridge)
      {
         return (EntityBridge) field;
      }
      else
      {
         return null;
      }
   }

   public int size()
   {
      return fieldList.size();
   }

   public String toString()
   {
      return pathList.get(pathList.size() - 1) + " <" + type + ">";
   }

   public boolean equals(Object o)
   {
      if(o instanceof ASTPath)
      {
         ASTPath path = (ASTPath) o;
         return path.getPath().equals(getPath());
      }
      return false;
   }

   public int hashCode()
   {
      return getPath().hashCode();
   }

   /**
    * Accept the visitor. *
    */
   public Object jjtAccept(JBossQLParserVisitor visitor, Object data)
   {
      return visitor.visit(this, data);
   }
}