/* * 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 net.neoremind.kraps.util import java.io.ByteArrayOutputStream import java.nio.ByteBuffer /** * Provide a zero-copy way to convert data in ByteArrayOutputStream to ByteBuffer */ class ByteBufferOutputStream(capacity: Int) extends ByteArrayOutputStream(capacity) { def this() = this(32) def getCount(): Int = count private[this] var closed: Boolean = false override def write(b: Int): Unit = { require(!closed, "cannot write to a closed ByteBufferOutputStream") super.write(b) } override def write(b: Array[Byte], off: Int, len: Int): Unit = { require(!closed, "cannot write to a closed ByteBufferOutputStream") super.write(b, off, len) } override def reset(): Unit = { require(!closed, "cannot reset a closed ByteBufferOutputStream") super.reset() } override def close(): Unit = { if (!closed) { super.close() closed = true } } def toByteBuffer: ByteBuffer = { require(closed, "can only call toByteBuffer() after ByteBufferOutputStream has been closed") ByteBuffer.wrap(buf, 0, count) } }