FilesystemPackageModuleMapper.java
/*-
* #%L
* io.earcam.instrumental.archive.jpms
* %%
* Copyright (C) 2018 earcam
* %%
* SPDX-License-Identifier: (BSD-3-Clause OR EPL-1.0 OR Apache-2.0 OR MIT)
*
* You <b>must</b> choose to accept, in full - any individual or combination of
* the following licenses:
* <ul>
* <li><a href="https://opensource.org/licenses/BSD-3-Clause">BSD-3-Clause</a></li>
* <li><a href="https://www.eclipse.org/legal/epl-v10.html">EPL-1.0</a></li>
* <li><a href="https://www.apache.org/licenses/LICENSE-2.0">Apache-2.0</a></li>
* <li><a href="https://opensource.org/licenses/MIT">MIT</a></li>
* </ul>
* #L%
*/
package io.earcam.instrumental.archive.jpms.auto;
import static java.util.stream.Collectors.toList;
import java.nio.file.Path;
import java.util.List;
import java.util.Objects;
import java.util.stream.Stream;
import io.earcam.instrumental.module.jpms.ModuleInfo;
import io.earcam.unexceptional.Exceptional;
/**
* Provides a PackageModuleMapper for subclasses simply implementing {@link #paths()}
*
*/
public abstract class FilesystemPackageModuleMapper extends AbstractPackageModuleMapper {
private List<ModuleInfo> modules;
@Override
protected final List<ModuleInfo> modules()
{
loadModules();
return modules;
}
protected abstract Stream<Path> paths();
protected final synchronized void loadModules()
{
if(modules == null) {
modules = paths()
.map(Exceptional.uncheckFunction(this::moduleInfoFrom))
.filter(Objects::nonNull)
.collect(toList());
}
}
}