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A module that is everything required to understands Druid Segments
/*
* 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.druid.collections.bitmap;
import com.google.common.base.Preconditions;
import org.roaringbitmap.BatchIterator;
import org.roaringbitmap.PeekableIntIterator;
public final class BatchIteratorAdapter implements BatchIterator
{
private final PeekableIntIterator iterator;
public BatchIteratorAdapter(PeekableIntIterator iterator)
{
this.iterator = Preconditions.checkNotNull(iterator, "iterator");
}
@Override
public int nextBatch(int[] buffer)
{
int i;
for (i = 0; i < buffer.length && iterator.hasNext(); i++) {
buffer[i] = iterator.next();
}
return i;
}
@Override
public boolean hasNext()
{
return iterator.hasNext();
}
@Override
public void advanceIfNeeded(int target)
{
iterator.advanceIfNeeded(target);
}
@Override
public BatchIterator clone()
{
// It's okay to make a "new BatchIteratorAdapter" instead of calling super.clone(), since this class is final.
return new BatchIteratorAdapter(iterator.clone());
}
}