Package com.caucho.amber.expr

Source Code of com.caucho.amber.expr.AbstractPathExpr

/*
* Copyright (c) 1998-2011 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT.  See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
*   Free Software Foundation, Inc.
*   59 Temple Place, Suite 330
*   Boston, MA 02111-1307  USA
*
* @author Scott Ferguson
*/

package com.caucho.amber.expr;

import com.caucho.amber.AmberRuntimeException;
import com.caucho.amber.field.AmberField;
import com.caucho.amber.query.FromItem;
import com.caucho.amber.query.QueryParser;
import com.caucho.amber.type.BeanType;
import com.caucho.amber.type.EntityType;
import com.caucho.util.L10N;

/**
* Represents an amber mapping query expression
*/
abstract public class AbstractPathExpr extends AbstractAmberExpr
  implements PathExpr {
  private static final L10N L = new L10N(AbstractPathExpr.class);

  /**
   * Creates the expr from the path.
   */
  public AmberExpr createField(QueryParser parser, String fieldName)
  {
    AmberField field = null;

    BeanType type = getTargetType();

    do {
      field = type.getField(fieldName);

      if (type instanceof EntityType)
        type = ((EntityType) type).getParentType();
      else // XXX
        type = null;
    }
    while ((type != null) && (field == null));

    if (field == null)
      throw new AmberRuntimeException(L.l("'{0}' is an unknown field of '{1}' which has the following list of fields '{2}'",
                                          fieldName, getTargetType().getName(),
                                          getTargetType().getFields()));

    return field.createExpr(parser, this);
  }

  /**
   * Creates an array reference.
   */
  public AmberExpr createArray(AmberExpr field)
  {
    throw new UnsupportedOperationException(getClass().getName());
  }

  /**
   * Creates an id expression.
   */
  public IdExpr createId(FromItem fromItem)
  {
    return new CollectionIdExpr(fromItem, this);
  }

  /**
   * Creates a load expression.
   */
  public LoadExpr createLoad()
  {
    throw new UnsupportedOperationException(getClass().getName());
  }

  /**
   * Binds the expression as a select item.
   */
  public PathExpr bindSelect(QueryParser parser, String tableName)
  {
    return this;
  }

  /**
   * Binds the expression as a select item.
   */
  public FromItem bindSubPath(QueryParser parser)
  {
    return null;
  }

  /**
   * Returns the from item
   */
  public FromItem getChildFromItem()
  {
    throw new UnsupportedOperationException(getClass().getName());
  }
}
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