001////////////////////////////////////////////////////////////////////////////////
002// checkstyle: Checks Java source code for adherence to a set of rules.
003// Copyright (C) 2001-2018 the original author or authors.
004//
005// This library is free software; you can redistribute it and/or
006// modify it under the terms of the GNU Lesser General Public
007// License as published by the Free Software Foundation; either
008// version 2.1 of the License, or (at your option) any later version.
009//
010// This library is distributed in the hope that it will be useful,
011// but WITHOUT ANY WARRANTY; without even the implied warranty of
012// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
013// Lesser General Public License for more details.
014//
015// You should have received a copy of the GNU Lesser General Public
016// License along with this library; if not, write to the Free Software
017// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
018////////////////////////////////////////////////////////////////////////////////
019
020package com.puppycrawl.tools.checkstyle.checks.annotation;
021
022import com.puppycrawl.tools.checkstyle.StatelessCheck;
023import com.puppycrawl.tools.checkstyle.api.AbstractCheck;
024import com.puppycrawl.tools.checkstyle.api.DetailAST;
025import com.puppycrawl.tools.checkstyle.api.TokenTypes;
026import com.puppycrawl.tools.checkstyle.utils.AnnotationUtil;
027
028/**
029 * This check makes sure that all package annotations are in the
030 * package-info.java file.
031 *
032 * <p>
033 * According to the Java Language Specification.
034 * </p>
035 *
036 * <p>
037 * The JLS does not enforce the placement of package annotations.
038 * This placement may vary based on implementation. The JLS
039 * does highly recommend that all package annotations are
040 * placed in the package-info.java file.
041 *
042 * See <a
043 * href="https://docs.oracle.com/javase/specs/jls/se8/html/jls-7.html#jls-7.4.1">
044 * Java Language Specification, section 7.4.1</a>.
045 * </p>
046 */
047@StatelessCheck
048public class PackageAnnotationCheck extends AbstractCheck {
049
050    /**
051     * A key is pointing to the warning message text in "messages.properties"
052     * file.
053     */
054    public static final String MSG_KEY = "annotation.package.location";
055
056    @Override
057    public int[] getDefaultTokens() {
058        return getRequiredTokens();
059    }
060
061    @Override
062    public int[] getRequiredTokens() {
063        return new int[] {
064            TokenTypes.PACKAGE_DEF,
065        };
066    }
067
068    @Override
069    public int[] getAcceptableTokens() {
070        return getRequiredTokens();
071    }
072
073    @Override
074    public void visitToken(final DetailAST ast) {
075        final boolean containsAnnotation =
076            AnnotationUtil.containsAnnotation(ast);
077        final boolean inPackageInfo =
078            getFileContents().inPackageInfo();
079
080        if (containsAnnotation && !inPackageInfo) {
081            log(ast.getLine(), MSG_KEY);
082        }
083    }
084
085}