001///////////////////////////////////////////////////////////////////////////////////////////////
002// checkstyle: Checks Java source code and other text files for adherence to a set of rules.
003// Copyright (C) 2001-2024 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.naming;
021
022import com.puppycrawl.tools.checkstyle.api.DetailAST;
023import com.puppycrawl.tools.checkstyle.api.TokenTypes;
024import com.puppycrawl.tools.checkstyle.utils.ScopeUtil;
025
026/**
027 * <p>
028 * Checks that {@code static}, non-{@code final} variable names conform to a specified pattern.
029 * </p>
030 * <ul>
031 * <li>
032 * Property {@code applyToPackage} - Control if check should apply to package-private
033 *   members.
034 * Type is {@code boolean}.
035 * Default value is {@code true}.
036 * </li>
037 * <li>
038 * Property {@code applyToPrivate} - Control if check should apply to private members.
039 * Type is {@code boolean}.
040 * Default value is {@code true}.
041 * </li>
042 * <li>
043 * Property {@code applyToProtected} - Control if check should apply to protected
044 *   members.
045 * Type is {@code boolean}.
046 * Default value is {@code true}.
047 * </li>
048 * <li>
049 * Property {@code applyToPublic} - Control if check should apply to public members.
050 * Type is {@code boolean}.
051 * Default value is {@code true}.
052 * </li>
053 * <li>
054 * Property {@code format} - Sets the pattern to match valid identifiers.
055 * Type is {@code java.util.regex.Pattern}.
056 * Default value is {@code "^[a-z][a-zA-Z0-9]*$"}.
057 * </li>
058 * </ul>
059 * <p>
060 * Parent is {@code com.puppycrawl.tools.checkstyle.TreeWalker}
061 * </p>
062 * <p>
063 * Violation Message Keys:
064 * </p>
065 * <ul>
066 * <li>
067 * {@code name.invalidPattern}
068 * </li>
069 * </ul>
070 *
071 * @since 3.0
072 */
073public class StaticVariableNameCheck
074    extends AbstractAccessControlNameCheck {
075
076    /** Creates a new {@code StaticVariableNameCheck} instance. */
077    public StaticVariableNameCheck() {
078        super("^[a-z][a-zA-Z0-9]*$");
079    }
080
081    @Override
082    public int[] getDefaultTokens() {
083        return getRequiredTokens();
084    }
085
086    @Override
087    public int[] getAcceptableTokens() {
088        return getRequiredTokens();
089    }
090
091    @Override
092    public int[] getRequiredTokens() {
093        return new int[] {TokenTypes.VARIABLE_DEF};
094    }
095
096    @Override
097    protected final boolean mustCheckName(DetailAST ast) {
098        final DetailAST modifiersAST =
099            ast.findFirstToken(TokenTypes.MODIFIERS);
100        final boolean isStatic = modifiersAST.findFirstToken(TokenTypes.LITERAL_STATIC) != null;
101        final boolean isFinal = modifiersAST.findFirstToken(TokenTypes.FINAL) != null;
102
103        return isStatic
104                && !isFinal
105                && shouldCheckInScope(modifiersAST)
106                && !ScopeUtil.isInInterfaceOrAnnotationBlock(ast);
107    }
108
109}