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API used in Surefire and Failsafe MOJO.
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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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
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 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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package org.apache.maven.plugin.surefire;

import java.io.File;
import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.surefire.booter.Classpath;

import static java.util.Collections.addAll;
import static org.apache.maven.surefire.shared.utils.StringUtils.split;

final class TestClassPath {
    private final Iterable artifacts;
    private final File classesDirectory;
    private final File testClassesDirectory;
    private final Iterable additionalClasspathElements;

    TestClassPath(
            Iterable artifacts,
            File classesDirectory,
            File testClassesDirectory,
            Iterable additionalClasspathElements) {
        this.artifacts = artifacts;
        this.classesDirectory = classesDirectory;
        this.testClassesDirectory = testClassesDirectory;
        this.additionalClasspathElements = additionalClasspathElements;
    }

    Map getTestDependencies() {
        Map artifactMapping = new LinkedHashMap<>();
        for (Artifact artifact : artifacts) {
            artifactMapping.put(artifact.getGroupId() + ":" + artifact.getArtifactId(), artifact);
        }
        return artifactMapping;
    }

    Classpath toClasspath() {
        List classpath = new ArrayList<>();
        classpath.add(testClassesDirectory.getAbsolutePath());
        classpath.add(classesDirectory.getAbsolutePath());
        for (Artifact artifact : artifacts) {
            if (artifact.getArtifactHandler().isAddedToClasspath()) {
                File file = artifact.getFile();
                if (file != null) {
                    classpath.add(file.getAbsolutePath());
                }
            }
        }
        if (additionalClasspathElements != null) {
            for (String additionalClasspathElement : additionalClasspathElements) {
                if (additionalClasspathElement != null) {
                    addAll(classpath, split(additionalClasspathElement, ","));
                }
            }
        }

        return new Classpath(classpath);
    }
}