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LazyFileOutputStream.java
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/*
* SPDX-License-Identifier: Apache-2.0
*
* The OpenSearch Contributors require contributions made to
* this file be licensed under the Apache-2.0 license or a
* compatible open source license.
*/
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.
*/
/*
* Modifications Copyright OpenSearch Contributors. See
* GitHub history for details.
*/
package org.opensearch.gradle;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
/**
* An outputstream to a File that is lazily opened on the first write.
*/
class LazyFileOutputStream extends OutputStream {
private OutputStream delegate;
LazyFileOutputStream(File file) {
// use an initial dummy delegate to avoid doing a conditional on every write
this.delegate = new OutputStream() {
private void bootstrap() throws IOException {
file.getParentFile().mkdirs();
delegate = new FileOutputStream(file);
}
@Override
public void write(int b) throws IOException {
bootstrap();
delegate.write(b);
}
@Override
public void write(byte b[], int off, int len) throws IOException {
bootstrap();
delegate.write(b, off, len);
}
};
}
@Override
public void write(int b) throws IOException {
delegate.write(b);
}
@Override
public void write(byte b[], int off, int len) throws IOException {
delegate.write(b, off, len);
}
@Override
public void close() throws IOException {
delegate.close();
}
}