internal.sys.DefaultResourceExtractor Maven / Gradle / Ivy
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/*
* Copyright 2019 National Bank of Belgium
*
* Licensed under the EUPL, Version 1.1 or - as soon they will be approved
* by the European Commission - subsequent versions of the EUPL (the "Licence");
* You may not use this work except in compliance with the Licence.
* You may obtain a copy of the Licence at:
*
* http://ec.europa.eu/idabc/eupl
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the Licence is distributed on an "AS IS" basis,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the Licence for the specific language governing permissions and
* limitations under the Licence.
*/
package internal.sys;
import lombok.NonNull;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Files;
import java.nio.file.StandardCopyOption;
/**
*
* @author Philippe Charles
*/
@lombok.Value
@lombok.Builder
public class DefaultResourceExtractor implements ResourceExtractor {
@lombok.NonNull File repository;
boolean persist;
@lombok.NonNull Class anchor;
@Override
public @NonNull File getResourceAsFile(@NonNull String resourceName) throws IOException {
try (InputStream stream = anchor.getResourceAsStream(resourceName)) {
if (stream == null) {
throw new FileNotFoundException(resourceName);
}
File result = createEmptyFile(repository, resourceName);
Files.copy(stream, result.toPath(), StandardCopyOption.REPLACE_EXISTING);
if (!persist) {
result.deleteOnExit();
}
return result;
}
}
public static Builder builder() {
return new Builder()
.repository(getTempFolder())
.persist(false);
}
public static DefaultResourceExtractor of(Class anchor) {
return builder().anchor(anchor).build();
}
private static File getTempFolder() {
return new File(System.getProperty("java.io.tmpdir"));
}
private static File createEmptyFile(File parent, String resourceName) throws IOException {
int idx = resourceName.lastIndexOf(".");
return idx != -1
? File.createTempFile(resourceName.substring(0, idx), resourceName.substring(idx), parent)
: File.createTempFile("rsrc", resourceName, parent);
}
// fix javadoc
public static final class Builder {
}
}