英文:
How to validate Java code programatically?
问题
import javax.tools.*;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
public class Validator {
private final JavaCompiler COMPILER = ToolProvider.getSystemJavaCompiler();
public final boolean compiles(Set<File> srcFiles, SourceVersion version) throws IOException {
List<JavaFileObject> compilationUnits = new ArrayList<>();
for (File file : srcFiles) {
CompilableFile compilableFile = new CompilableFile(file.getName(), Files.readString(file.toPath()));
compilationUnits.add(compilableFile);
}
DiagnosticCollector<JavaFileObject> diagnosticCollector = new DiagnosticCollector<>();
JavaCompiler.CompilationTask task = COMPILER.getTask(null, null, diagnosticCollector, null, null, compilationUnits);
task.setProcessors(List.of(new SourceVersionProcessor(version))); // Set the SourceVersionProcessor
boolean success = task.call();
diagnosticCollector.getDiagnostics().forEach(Validator::printDiagnostic);
return success;
}
private static void printDiagnostic(Diagnostic<?> diagnostic) {
System.out.println(diagnostic.getCode());
System.out.println(diagnostic.getKind());
System.out.println(diagnostic.getPosition());
System.out.println(diagnostic.getStartPosition());
System.out.println(diagnostic.getEndPosition());
System.out.println(diagnostic.getSource());
System.out.println(diagnostic.getMessage(null));
}
private static final class CompilableFile extends SimpleJavaFileObject {
final String code;
CompilableFile(String name, String code) {
super(URI.create("string:///" + name.replace('.', '/') + Kind.SOURCE.extension), Kind.SOURCE);
this.code = code;
}
@Override
public CharSequence getCharContent(boolean ignoreEncodingErrors) {
return code;
}
}
// SourceVersionProcessor to support a specific source version
private static final class SourceVersionProcessor implements Processor {
private final SourceVersion version;
SourceVersionProcessor(SourceVersion version) {
this.version = version;
}
@Override
public Set<String> getSupportedOptions() {
return Set.of();
}
@Override
public Set<String> getSupportedAnnotationTypes() {
return Set.of();
}
@Override
public SourceVersion getSupportedSourceVersion() {
return version;
}
@Override
public void init(ProcessingEnvironment processingEnv) {
}
@Override
public boolean process(Set<? extends TypeElement> annotations, RoundEnvironment roundEnv) {
return false;
}
}
}
英文:
Given the source code and the Java version, I need to be able to validate whether or not the code will compile. If the code does not compile, I need to be able to return the errors within the source code.
The following solution works, but only for the Java version currently being used on your machine.
import javax.tools.*;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
public class Validator {
private final JavaCompiler COMPILER = ToolProvider.getSystemJavaCompiler();
//Assume srcFiles are java files that can be read
public final boolean compiles(Set<File> srcFiles) throws IOException {
//Convert files to JavaCompiler API compatible files
List<JavaFileObject> compilationUnits = new ArrayList<>();
for (File file : srcFiles) {
CompilableFile compilableFile = new CompilableFile(file.getName(), Files.readString(file.toPath()));
compilationUnits.add(compilableFile);
}
DiagnosticCollector<JavaFileObject> diagnosticCollector = new DiagnosticCollector<>();
JavaCompiler.CompilationTask task = COMPILER.getTask(null, null, diagnosticCollector, null, null, compilationUnits);
boolean success = task.call();
//Displaying the info of each warning, error, etc
diagnosticCollector.getDiagnostics().forEach(Validator::printDiagnostic);
return success;
}
private static void printDiagnostic(Diagnostic<?> diagnostic) {
System.out.println(diagnostic.getCode());
System.out.println(diagnostic.getKind());
System.out.println(diagnostic.getPosition());
System.out.println(diagnostic.getStartPosition());
System.out.println(diagnostic.getEndPosition());
System.out.println(diagnostic.getSource());
System.out.println(diagnostic.getMessage(null));
}
/**
* Instances of this class can be compiled with the JavaCompiler API
*/
private static final class CompilableFile extends SimpleJavaFileObject {
final String code;
CompilableFile(String name, String code) {
super(URI.create("string:///" + name.replace('.', '/') + Kind.SOURCE.extension), Kind.SOURCE);
this.code = code;
}
@Override
public CharSequence getCharContent(boolean ignoreEncodingErrors) {
return code;
}
}
}
Is there anyway I could implement the following function?
public final boolean compiles(Set<File> srcFiles, SourceVersion version) {...}
答案1
得分: 1
以下是翻译好的内容：
import javax.tools.*;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
public class Validator {
private final JavaCompiler COMPILER = ToolProvider.getSystemJavaCompiler();
// 假设 srcFiles 是可以读取的 Java 文件
public final boolean compiles(Set<File> srcFiles, String javaVersion) throws IOException {
// 将文件转换为 JavaCompiler API 兼容的文件
List<JavaFileObject> compilationUnits = new ArrayList<>();
for (File file : srcFiles) {
CompilableFile compilableFile = new CompilableFile(file.getName(), Files.readString(file.toPath()));
compilationUnits.add(compilableFile);
}
DiagnosticCollector<JavaFileObject> diagnosticCollector = new DiagnosticCollector<>();
JavaCompiler.CompilationTask task = COMPILER.getTask(null, null, diagnosticCollector, List.of("--release", javaVersion), null, compilationUnits);
boolean success = task.call();
// 显示每个警告、错误等的信息
diagnosticCollector.getDiagnostics().forEach(Validator::printDiagnostic);
return success;
}
private static void printDiagnostic(Diagnostic<?> diagnostic) {
System.out.println(diagnostic.getCode());
System.out.println(diagnostic.getKind());
System.out.println(diagnostic.getPosition());
System.out.println(diagnostic.getStartPosition());
System.out.println(diagnostic.getEndPosition());
System.out.println(diagnostic.getSource());
System.out.println(diagnostic.getMessage(null));
}
/**
* 此类的实例可以使用 JavaCompiler API 进行编译
*/
private static final class CompilableFile extends SimpleJavaFileObject {
final String code;
CompilableFile(String name, String code) {
super(URI.create("string:///" + name.replace('.', '/') + Kind.SOURCE.extension), Kind.SOURCE);
this.code = code;
}
@Override
public CharSequence getCharContent(boolean ignoreEncodingErrors) {
return code;
}
}
}
英文:
The range of version that this solution works on seem to be compiler specific, but for OpenJDK 11 and 15, I noticed this solution worked for [7, SYSTEM_COMPILER_VERSION]
The JavaCompiler API allows you to pass command line options as an Iterable when you call the method JavaCompiler.CompilationTask::getTask, so you can pass List.of("--release", "<version>") where <version> is replaced by the version you are verifying
With this in mind, the solution becomes
import javax.tools.*;
import java.io.File;
import java.io.IOException;
import java.net.URI;
import java.nio.file.Files;
import java.util.ArrayList;
import java.util.List;
import java.util.Set;
public class Validator {
private final JavaCompiler COMPILER = ToolProvider.getSystemJavaCompiler();
//Assume srcFiles are java files that can be read
public final boolean compiles(Set<File> srcFiles, String javaVersion) throws IOException {
//Convert files to JavaCompiler API compatible files
List<JavaFileObject> compilationUnits = new ArrayList<>();
for (File file : srcFiles) {
CompilableFile compilableFile = new CompilableFile(file.getName(), Files.readString(file.toPath()));
compilationUnits.add(compilableFile);
}
DiagnosticCollector<JavaFileObject> diagnosticCollector = new DiagnosticCollector<>();
JavaCompiler.CompilationTask task = COMPILER.getTask(null, null, diagnosticCollector, List.of("--release", javaVersion), null, compilationUnits);
boolean success = task.call();
//Displaying the info of each warning, error, etc
diagnosticCollector.getDiagnostics().forEach(Validator::printDiagnostic);
return success;
}
private static void printDiagnostic(Diagnostic<?> diagnostic) {
System.out.println(diagnostic.getCode());
System.out.println(diagnostic.getKind());
System.out.println(diagnostic.getPosition());
System.out.println(diagnostic.getStartPosition());
System.out.println(diagnostic.getEndPosition());
System.out.println(diagnostic.getSource());
System.out.println(diagnostic.getMessage(null));
}
/**
* Instances of this class can be compiled with the JavaCompiler API
*/
private static final class CompilableFile extends SimpleJavaFileObject {
final String code;
CompilableFile(String name, String code) {
super(URI.create("string:///" + name.replace('.', '/') + Kind.SOURCE.extension), Kind.SOURCE);
this.code = code;
}
@Override
public CharSequence getCharContent(boolean ignoreEncodingErrors) {
return code;
}
}
}
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