com.apple.foundationdb.RangeResultDirectBufferIterator Maven / Gradle / Ivy
/*
* RangeResultDirectBufferIterator.java
*
* This source file is part of the FoundationDB open source project
*
* Copyright 2015-2020 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.Iterator;
import java.util.NoSuchElementException;
/**
* Holds the direct buffer that is shared with JNI wrapper. A typical usage is as follows:
*
* The serialization format of result is =>
* [int keyCount, boolean more, ListOf<(int keyLen, int valueLen, byte[] key, byte[] value)>]
*/
class RangeResultDirectBufferIterator extends DirectBufferIterator implements Iterator {
RangeResultDirectBufferIterator(ByteBuffer buffer) { super(buffer); }
@Override
public boolean hasNext() {
return super.hasNext();
}
@Override
public KeyValue next() {
assert (hasResultReady()); // Must be called once its ready.
if (!hasNext()) {
throw new NoSuchElementException();
}
final int keyLen = byteBuffer.getInt();
final int valueLen = byteBuffer.getInt();
byte[] key = new byte[keyLen];
byteBuffer.get(key);
byte[] value = new byte[valueLen];
byteBuffer.get(value);
current += 1;
return new KeyValue(key, value);
}
}