com.querydsl.codegen.utils.SimpleCompiler Maven / Gradle / Ivy

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/*
 * Copyright 2010, Mysema Ltd
 *
 * 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 com.querydsl.codegen.utils;

import io.github.classgraph.ClassGraph;

import javax.lang.model.SourceVersion;
import javax.tools.*;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Writer;
import java.net.URL;
import java.net.URLClassLoader;
import java.nio.charset.Charset;
import java.util.ArrayList;
import java.util.List;
import java.util.Locale;
import java.util.Set;

/**
 * SimpleCompiler provides a convenience wrapper of the JavaCompiler interface
 * with automatic classpath generation
 *
 * @author tiwe
 *
 */
public class SimpleCompiler implements JavaCompiler {

    protected static boolean isSureFireBooter(URLClassLoader cl) {
        for (URL url : cl.getURLs()) {
            if (url.getPath().contains("surefirebooter")) {
                return true;
            }
        }

        return false;
    }

    public static String getClassPath(ClassLoader cl) {
        return new ClassGraph().overrideClassLoaders(cl).getClasspath();
    }

    private final ClassLoader classLoader;

    private String classPath;

    private final JavaCompiler compiler;

    public SimpleCompiler() {
        this(ToolProvider.getSystemJavaCompiler(), Thread.currentThread().getContextClassLoader());
    }

    public SimpleCompiler(JavaCompiler compiler, ClassLoader classLoader) {
        this.compiler = compiler;
        this.classLoader = classLoader;
    }

    private String getClasspath() {
        if (classPath == null) {
            classPath = getClassPath(classLoader);
        }
        return classPath;
    }

    @Override
    public Set getSourceVersions() {
        return compiler.getSourceVersions();
    }

    @Override
    public StandardJavaFileManager getStandardFileManager(
            DiagnosticListener diagnosticListener, Locale locale,
            Charset charset) {
        return compiler.getStandardFileManager(diagnosticListener, locale, charset);
    }

    @Override
    public CompilationTask getTask(Writer out, JavaFileManager fileManager,
            DiagnosticListener diagnosticListener,
            Iterable options, Iterable classes,
            Iterable compilationUnits) {
        return compiler.getTask(out, fileManager, diagnosticListener, options, classes,
                compilationUnits);
    }

    @Override
    public int isSupportedOption(String option) {
        return compiler.isSupportedOption(option);
    }

    @Override
    public int run(InputStream in, OutputStream out, OutputStream err, String... arguments) {
        for (String a : arguments) {
            if (a.equals("-classpath")) {
                return compiler.run(in, out, err, arguments);
            }
        }

        // no classpath given
        List args = new ArrayList(arguments.length + 2);
        args.add("-classpath");
        args.add(getClasspath());
        for (String arg : arguments) {
            args.add(arg);
        }
        return compiler.run(in, out, err, args.toArray(new String[args.size()]));
    }

}