package org.gradle.plugins.ide.internal.tooling.model;

import java.io.Serializable;
import java.util.Comparator;

/**
 * Compares task names to create ordering for selector launching.
 */
public class TaskNameComparator implements Comparator<String>, Serializable {
    @Override
    public int compare(String taskName1, String taskName2) {
        int depthDiff = getDepth(taskName1) - getDepth(taskName2);
        if (depthDiff != 0) {

    private final ProjectTaskLister taskLister;
    private final TaskNameComparator taskNameComparator;

    public BuildInvocationsBuilder(ProjectTaskLister taskLister) {
        this.taskLister = taskLister;
        this.taskNameComparator = new TaskNameComparator();
    }

    @Override
    public boolean canBuild(String modelName) {

package org.gradle.plugins.ide.internal.tooling

import org.gradle.plugins.ide.internal.tooling.model.TaskNameComparator
import spock.lang.Specification
import spock.lang.Unroll

class TaskNameComparatorTest extends Specification {
    @Unroll('compares task names #first and #second')
    def compare() {
        def comparator = new TaskNameComparator()

        expect:
        comparator.compare(first, second) < 0

        grandChild2OfChild | ['t4']                   | ['t4',]       | []                 | []
    }

    def "TaskSelector description is taken from task that TaskNameComparator considers to be of lowest ordering"() {
        given:
        def builder = new BuildInvocationsBuilder(new DefaultProjectTaskLister())

        when:

$helloWorldGroupHeader
a
sub1:a
sub2:a
""")
        output.contains("""
$otherGroupHeader
sub1:b
sub2:b
c
""")
    }

    def "task selector description is taken from task that TaskNameComparator considers to be of lowest ordering"() {
        given:
        settingsFile << """
include 'sub1'
include 'sub2'
"""
        file("sub1/build.gradle") << """
            task alpha {

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