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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.admin.task.util.file;
import com.yahoo.vespa.hosted.node.admin.component.TaskContext;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.util.Optional;
import java.util.function.Supplier;
/**
* Write a file
*
* @author hakonhall
*/
public class FileWriter {
private final Path path;
private final FileSync fileSync;
private final PartialFileData.Builder fileDataBuilder = PartialFileData.builder();
private final Optional<ByteArraySupplier> contentProducer;
private boolean atomicWrite = false;
private boolean overwriteExistingFile = true;
public FileWriter(Path path) {
this(path, Optional.empty());
}
public FileWriter(Path path, Supplier<String> contentProducer) {
this(path, () -> contentProducer.get().getBytes(StandardCharsets.UTF_8));
}
public FileWriter(Path path, ByteArraySupplier contentProducer) {
this(path, Optional.of(contentProducer));
}
private FileWriter(Path path, Optional<ByteArraySupplier> contentProducer) {
this.path = path;
this.fileSync = new FileSync(path);
this.contentProducer = contentProducer;
}
public Path path() { return path; }
public FileWriter withOwnerId(int ownerId) {
fileDataBuilder.withOwnerId(ownerId);
return this;
}
public FileWriter withGroupId(int groupId) {
fileDataBuilder.withGroupId(groupId);
return this;
}
/** @see UnixPath#setPermissions */
public FileWriter withPermissions(String permissions) {
fileDataBuilder.withPermissions(permissions);
return this;
}
public FileWriter atomicWrite(boolean atomicWrite) {
this.atomicWrite = atomicWrite;
return this;
}
public FileWriter onlyIfFileDoesNotAlreadyExist() {
overwriteExistingFile = false;
return this;
}
public boolean converge(TaskContext context) {
return converge(context, contentProducer.orElseThrow().get());
}
public boolean converge(TaskContext context, String utf8Content) {
return converge(context, utf8Content.getBytes(StandardCharsets.UTF_8));
}
public boolean converge(TaskContext context, byte[] content) {
if (!overwriteExistingFile && Files.isRegularFile(path)) {
return false;
}
fileDataBuilder.withContent(content);
PartialFileData fileData = fileDataBuilder.create();
return fileSync.convergeTo(context, fileData, atomicWrite);
}
@FunctionalInterface
public interface ByteArraySupplier extends Supplier<byte[]> { }
}
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