iterator-test-harness/src/main/java/org/apache/accumulo/iteratortest/IteratorTestUtil.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.accumulo.iteratortest;

import static java.util.Objects.requireNonNull;

import org.apache.accumulo.core.data.Key;
import org.apache.accumulo.core.data.Value;
import org.apache.accumulo.core.iterators.SortedKeyValueIterator;
import org.apache.accumulo.core.iterators.SortedMapIterator;
import org.apache.accumulo.core.iteratorsImpl.system.ColumnFamilySkippingIterator;
import org.apache.accumulo.iteratortest.testcases.IteratorTestCase;

/**
 * A collection of methods that are helpful to the development of {@link IteratorTestCase}s.
 */
public class IteratorTestUtil {

  public static SortedKeyValueIterator<Key,Value> instantiateIterator(IteratorTestInput input) {
    try {
      return requireNonNull(input.getIteratorClass()).getDeclaredConstructor().newInstance();
    } catch (ReflectiveOperationException e) {
      throw new RuntimeException(e);
    }
  }

  public static SortedKeyValueIterator<Key,Value> createSource(IteratorTestInput input) {
    return new SimpleKVReusingIterator(
        new ColumnFamilySkippingIterator(new SortedMapIterator(requireNonNull(input).getInput())));
  }
}