org.springframework.core.io.buffer.DataBufferOutputStream Maven / Gradle / Ivy
/*
* Copyright 2002-2022 the original author or 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
*
* https://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.springframework.core.io.buffer;
import java.io.IOException;
import java.io.OutputStream;
import org.springframework.util.Assert;
/**
* An {@link OutputStream} that writes to a {@link DataBuffer}.
*
* @author Arjen Poutsma
* @since 6.0
* @see DataBuffer#asOutputStream()
*/
final class DataBufferOutputStream extends OutputStream {
private final DataBuffer dataBuffer;
private boolean closed;
public DataBufferOutputStream(DataBuffer dataBuffer) {
Assert.notNull(dataBuffer, "DataBuffer must not be null");
this.dataBuffer = dataBuffer;
}
@Override
public void write(int b) throws IOException {
checkClosed();
this.dataBuffer.ensureWritable(1);
this.dataBuffer.write((byte) b);
}
@Override
public void write(byte[] b, int off, int len) throws IOException {
checkClosed();
if (len > 0) {
this.dataBuffer.ensureWritable(len);
this.dataBuffer.write(b, off, len);
}
}
@Override
public void close() {
if (this.closed) {
return;
}
this.closed = true;
}
private void checkClosed() throws IOException {
if (this.closed) {
throw new IOException("DataBufferOutputStream is closed");
}
}
}