com.sinch.xms.ByteInOutStream Maven / Gradle / Ivy
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/*-
* #%L
* SDK for Sinch SMS
* %%
* Copyright (C) 2016 Sinch
* %%
* 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.
* #L%
*/
package com.sinch.xms;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.nio.ByteBuffer;
import javax.annotation.Nonnull;
import javax.annotation.ParametersAreNonnullByDefault;
/**
* An output stream that reads and buffers bytes. It is capable of later creating an input stream
* for the read bytes without copying the bytes again.
*
* Internally this relies on {@link ByteArrayOutputStream} and {@link ByteArrayInputStream},
* which unfortunately are riddled with synchronized keywords possibly making
* performance suffer.
*/
@ParametersAreNonnullByDefault
final class ByteInOutStream extends ByteArrayOutputStream {
public ByteInOutStream(int initialSize) {
super(initialSize);
}
/**
* Writes the given byte buffer to this stream.
*
* @param buf the byte buffer to write
*/
public void write(ByteBuffer buf) {
/*
* The HTTP client library currently always uses a backing array but in
* case this changes in the future we also support byte buffers without
* backing array.
*/
if (buf.hasArray()) {
write(buf.array(), buf.arrayOffset() + buf.position(), buf.remaining());
} else {
for (int i = buf.position(); i < buf.limit(); i++) {
write(buf.get(i));
}
}
}
/**
* Creates an input stream from which the written data can be read. Note, the returned input
* stream shares its data buffer with this class. It is therefore important to not interact
* further with this object after this method is called!
*
* @return an input stream
*/
@Nonnull
public InputStream toInputStream() {
return new ByteArrayInputStream(buf, 0, count);
}
}