exec/java-exec/src/main/java/org/apache/drill/exec/record/VectorAccessible.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.drill.exec.record;

import org.apache.drill.common.expression.SchemaPath;
import org.apache.drill.exec.record.selection.SelectionVector2;
import org.apache.drill.exec.record.selection.SelectionVector4;

public interface VectorAccessible extends Iterable<VectorWrapper<?>> {
  // TODO are these <?> related in any way? Should they be the same one?
  VectorWrapper<?> getValueAccessorById(Class<?> clazz, int... fieldIds);

  /**
   * Get the value vector type and id for the given schema path. The TypedFieldId
   * should store a fieldId which is the same as the ordinal position of the field
   * within the Iterator provided this classes implementation of
   * <code>Iterable&lt;ValueVector><code>.
   *
   * @param path the path where the vector should be located.
   * @return the local field id associated with this vector. If no field matches this
   *   path, this will return a null TypedFieldId
   */
  TypedFieldId getValueVectorId(SchemaPath path);

  /**
   * Get the schema of the current RecordBatch. This changes if and only if a *_NEW_SCHEMA
   * IterOutcome is provided.
   *
   * @return schema of the current batch
   */
  BatchSchema getSchema();

  /**
   * Get the number of records.
   *
   * @return number of records
   */
  int getRecordCount();

  SelectionVector2 getSelectionVector2();

  SelectionVector4 getSelectionVector4();
}