org.springframework.boot.maven.CommandLineBuilder Maven / Gradle / Ivy
/*
* Copyright 2012-2024 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
*
* https://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.maven;
import java.io.File;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Map;
import java.util.Objects;
/**
* Helper class to build the command-line arguments of a java process.
*
* @author Stephane Nicoll
*/
final class CommandLineBuilder {
private final List options = new ArrayList<>();
private final List classpathElements = new ArrayList<>();
private final String mainClass;
private final List arguments = new ArrayList<>();
private CommandLineBuilder(String mainClass) {
this.mainClass = mainClass;
}
static CommandLineBuilder forMainClass(String mainClass) {
return new CommandLineBuilder(mainClass);
}
CommandLineBuilder withJvmArguments(String... jvmArguments) {
if (jvmArguments != null) {
this.options.addAll(Arrays.stream(jvmArguments).filter(Objects::nonNull).toList());
}
return this;
}
CommandLineBuilder withSystemProperties(Map systemProperties) {
if (systemProperties != null) {
systemProperties.entrySet()
.stream()
.map((e) -> SystemPropertyFormatter.format(e.getKey(), e.getValue()))
.forEach(this.options::add);
}
return this;
}
CommandLineBuilder withClasspath(URL... elements) {
this.classpathElements.addAll(Arrays.asList(elements));
return this;
}
CommandLineBuilder withArguments(String... arguments) {
if (arguments != null) {
this.arguments.addAll(Arrays.stream(arguments).filter(Objects::nonNull).toList());
}
return this;
}
List build() {
List commandLine = new ArrayList<>();
if (!this.options.isEmpty()) {
commandLine.addAll(this.options);
}
if (!this.classpathElements.isEmpty()) {
commandLine.add("-cp");
commandLine.add(ClasspathBuilder.build(this.classpathElements));
}
commandLine.add(this.mainClass);
if (!this.arguments.isEmpty()) {
commandLine.addAll(this.arguments);
}
return commandLine;
}
static class ClasspathBuilder {
static String build(List classpathElements) {
StringBuilder classpath = new StringBuilder();
for (URL element : classpathElements) {
if (!classpath.isEmpty()) {
classpath.append(File.pathSeparator);
}
classpath.append(toFile(element));
}
return classpath.toString();
}
private static File toFile(URL element) {
try {
return new File(element.toURI());
}
catch (URISyntaxException ex) {
throw new IllegalArgumentException(ex);
}
}
}
/**
* Format System properties.
*/
private static final class SystemPropertyFormatter {
static String format(String key, String value) {
if (key == null) {
return "";
}
if (value == null || value.isEmpty()) {
return String.format("-D%s", key);
}
return String.format("-D%s=\"%s\"", key, value);
}
}
}