/*
* Copyright 2012-2017 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
*
* 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.
*/
package org.springframework.boot.gradle.plugin;
import java.io.File;
import java.io.IOException;
import java.util.Objects;
import java.util.concurrent.Callable;
import java.util.function.Supplier;
import org.gradle.api.Project;
import org.gradle.api.file.FileCollection;
import org.springframework.boot.loader.tools.MainClassFinder;
/**
* A {@link Callable} that provide a convention for the project's main class name.
*
* @author Andy Wilkinson
*/
final class MainClassConvention implements Callable<Object> {
private static final String SPRING_BOOT_APPLICATION_CLASS_NAME = "org.springframework.boot.autoconfigure.SpringBootApplication";
private final Project project;
private final Supplier<FileCollection> classpathSupplier;
MainClassConvention(Project project, Supplier<FileCollection> classpathSupplier) {
this.project = project;
this.classpathSupplier = classpathSupplier;
}
@Override
public Object call() throws Exception {
if (this.project.hasProperty("mainClassName")) {
return this.project.property("mainClassName");
}
return resolveMainClass();
}
private String resolveMainClass() {
return this.classpathSupplier.get().filter(File::isDirectory).getFiles().stream()
.map(this::findMainClass).filter(Objects::nonNull).findFirst()
.orElse(null);
}
private String findMainClass(File file) {
try {
return MainClassFinder.findSingleMainClass(file,
SPRING_BOOT_APPLICATION_CLASS_NAME);
}
catch (IOException ex) {
return null;
}
}
}