io.takari.builder.internal.JvmClasspathEntriesSupplier Maven / Gradle / Ivy

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package io.takari.builder.internal;

import java.io.File;
import java.util.Collection;
import java.util.LinkedHashSet;
import java.util.stream.Stream;

import javax.inject.Named;
import javax.inject.Singleton;

import io.takari.incrementalbuild.classpath.ClasspathEntriesSupplier;

@Named
@Singleton
public class JvmClasspathEntriesSupplier implements ClasspathEntriesSupplier {

  private final Collection classpath = new LinkedHashSet<>();

  public JvmClasspathEntriesSupplier() {
    // these system properties define various class- and native- paths used by jvm and maven core
    // always allow reads from them because classloading can happen at any time

    // java home, needed to read security policy, logging config, etc
    // NB: need to compensate for jre/jdk layout
    String javaHome = System.getProperty("java.home");
    if (javaHome != null) {
      if (javaHome.endsWith(File.separator + "jre")) {
        javaHome = javaHome.substring(0, javaHome.length() - 3);
      }
      classpath.add(javaHome);
    }

    // standard jvm classpath and native path
    addPathProperty("java.endorsed.dirs");
    addPathProperty("java.ext.dirs");
    addPathProperty("java.class.path");
    addPathProperty("java.library.path");
    addPathProperty("sun.boot.library.path"); // classpath

    // maven home and standard (and semi-standard) maven classpath properties
    String mavenHome = System.getProperty("maven.home");
    if (mavenHome != null) {
      classpath.add(mavenHome);
    }
    addPathProperty("maven.ext.class.path");
    addPathProperty("mavendev.testclasspath");

  }

  private void addPathProperty(String name) {
    String value = System.getProperty(name);
    if (value != null && !value.isEmpty()) {
      Stream.of(value.split(File.pathSeparator)) //
          // dont include empty place or current localtion
          .filter(path -> path != null && !".".equals(path) && !"".equals(path)) //
          .forEach(path -> {
            classpath.add(path);
          });
    }
  }

  @Override
  public Collection entries() {
    return classpath;
  }

}