/*
 * Copyright 2010-2012 Luca Garulli (l.garulli--at--orientechnologies.com)
 *
 * 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 com.orientechnologies.orient.core.sql.operator;

import java.util.Collection;
import java.util.List;

import com.orientechnologies.orient.core.command.OCommandContext;
import com.orientechnologies.orient.core.db.ODatabaseComplex;
import com.orientechnologies.orient.core.db.record.OIdentifiable;
import com.orientechnologies.orient.core.record.impl.ODocument;
import com.orientechnologies.orient.core.sql.filter.OSQLFilterCondition;

/**
 * Operator that filters the target records.
 * 
 * @author Luca Garulli
 * 
 */
public abstract class OQueryTargetOperator extends OQueryOperator {
  protected OQueryTargetOperator(final String iKeyword, final int iPrecedence, final boolean iLogical) {
    super(iKeyword, iPrecedence, false);
  }

  public abstract Collection<OIdentifiable> filterRecords(final ODatabaseComplex<?> iRecord, final List<String> iTargetClasses,
      final OSQLFilterCondition iCondition, final Object iLeft, final Object iRight);

  /**
   * At run-time the evaluation per record must return always true since the recordset are filtered at the beginning unless an
   * operator can work in both modes. In this case sub-class must extend it.
   */
  @Override
  public Object evaluateRecord(final OIdentifiable iRecord, ODocument iCurrentResult, final OSQLFilterCondition iCondition,
      final Object iLeft, final Object iRight, OCommandContext iContext) {
    return true;
  }
}
