return rootDirectory;
    }

    public DefaultIdeaContentRoot setRootDirectory(File rootDirectory) {
        this.rootDirectory = rootDirectory;
        return this;
    }

    public Set<DefaultIdeaSourceDirectory> getSourceDirectories() {
        return sourceDirectories;
    }

    public DefaultIdeaContentRoot setSourceDirectories(Set<DefaultIdeaSourceDirectory> sourceDirectories) {

import java.util.LinkedList;
import java.util.List;

public class DefaultIdeaModule implements Serializable, GradleProjectIdentity {
    private String name;
    private List<DefaultIdeaContentRoot> contentRoots = new LinkedList<DefaultIdeaContentRoot>();
    private DefaultIdeaProject parent;

    private List<DefaultIdeaDependency> dependencies = new LinkedList<DefaultIdeaDependency>();
    private DefaultGradleProject gradleProject;

        String languageLevel = ideaLanguageLevel.getLevel();
        return JavaVersion.valueOf(languageLevel.replaceFirst("JDK", "VERSION"));
    }

    public static DefaultIdeaContentRoot buildContentRoot(IdeaModule ideaModule) {
        return new DefaultIdeaContentRoot()
            .setRootDirectory(ideaModule.getContentRoot())
            .setSourceDirectories(buildSourceDirectories(ideaModule.getSourceDirs(), ideaModule.getGeneratedSourceDirs()))

        this.javaTargetCompatibility = javaTargetCompatibility;
    }

    public DefaultIdeaContentRoot getContentRoot() {
        return contentRoot;
    }

    public void setContentRoot(DefaultIdeaContentRoot contentRoot) {
        this.contentRoot = contentRoot;
    }

    public String getJdkName() {
        return jdkName;
    }

import org.gradle.plugins.ide.idea.model.IdeaModel;
import org.gradle.plugins.ide.idea.model.IdeaModule;
import org.gradle.plugins.ide.idea.model.IdeaProject;
import org.gradle.plugins.ide.internal.tooling.idea.DefaultIdeaContentRoot;
import org.gradle.plugins.ide.internal.tooling.idea.DefaultIdeaDependency;
import org.gradle.plugins.ide.internal.tooling.idea.DefaultIdeaJavaLanguageSettings;

Class <org.gradle.plugins.ide.internal.tooling.idea.DefaultIdeaContentRoot> is not annotated (directly or via its package) with @org.gradle.api.NonNullApi in (DefaultIdeaContentRoot.java:0)