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Clover is an award winning code coverage and testing tool for Java and Groovy. It integrates easily with Maven, Ant, Grails, Eclipse and IntelliJ IDEA as well as with continuous integration servers such as Bamboo, Jenkins or Hudson. Note: before Clover 4.0 this artifact was named com.cenqua.clover:clover.

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package com.atlassian.clover.spi.lang;

import clover.com.google.common.collect.Sets;

import java.util.Collections;
import java.util.Locale;
import java.util.Set;

/**
 * A language that Clover may support.
 */
public interface Language {
    /**
     * @return the language's name
     */
    String getName();

    /**
     * @return the file extensions supported by the language (e.g. ".java")
     */
    Set getFileExtensions();

    /**
     * @return the language constructs supported by the language
     */
    Set getSupportedConstructs();

    /**
     * Languages supported by Clover out-of-the-box.
     */
    public enum Builtin implements Language {
        JAVA(".java", LanguageConstruct.Builtin.METHOD, LanguageConstruct.Builtin.BRANCH, LanguageConstruct.Builtin.STATEMENT),
        GROOVY(".groovy", LanguageConstruct.Builtin.METHOD, LanguageConstruct.Builtin.BRANCH, LanguageConstruct.Builtin.STATEMENT, LanguageConstruct.Builtin.GROOVY_FIELD_EXPRESSION, LanguageConstruct.Builtin.GROOVY_SAFE_METHOD, LanguageConstruct.Builtin.GROOVY_SAFE_ATTRIBUTE, LanguageConstruct.Builtin.GROOVY_SAFE_PROPERTY);

        private final Set extensions;
        private final Set constructs;

        private Builtin(String extension, LanguageConstruct... constructs) {
            this.extensions = Collections.singleton(extension);
            this.constructs = Collections.unmodifiableSet(Sets.newHashSet(constructs));
        }

        @Override
        public String getName() {
            return name().toLowerCase(Locale.ENGLISH);
        }

        @Override
        public Set getFileExtensions() {
            return extensions;
        }

        @Override
        public Set getSupportedConstructs() {
            return constructs;
        }
    }
}