com.apple.foundationdb.MappedRangeResultDirectBufferIterator Maven / Gradle / Ivy
/*
* MappedRangeResultDirectBufferIterator.java
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2015-2022 Apple Inc. and the FoundationDB project authors
*
* 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.apple.foundationdb;
import java.io.Closeable;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
/**
* Holds the direct buffer that is shared with JNI wrapper.
*/
class MappedRangeResultDirectBufferIterator extends DirectBufferIterator implements Iterator {
MappedRangeResultDirectBufferIterator(ByteBuffer buffer) { super(buffer); }
@Override
public boolean hasNext() {
return super.hasNext();
}
@Override
public MappedKeyValue next() {
assert (hasResultReady()); // Must be called once its ready.
if (!hasNext()) {
throw new NoSuchElementException();
}
final byte[] key = getString();
final byte[] value = getString();
final byte[] rangeBegin = getString();
final byte[] rangeEnd = getString();
final int rangeResultSize = byteBuffer.getInt();
List rangeResult = new ArrayList();
for (int i = 0; i < rangeResultSize; i++) {
final byte[] k = getString();
final byte[] v = getString();
rangeResult.add(new KeyValue(k, v));
}
current += 1;
return new MappedKeyValue(key, value, rangeBegin, rangeEnd, rangeResult);
}
private byte[] getString() {
final int len = byteBuffer.getInt();
byte[] s = new byte[len];
byteBuffer.get(s);
return s;
}
}