001///////////////////////////////////////////////////////////////////////////////////////////////
002// checkstyle: Checks Java source code and other text files for adherence to a set of rules.
003// Copyright (C) 2001-2026 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;
024
025/**
026 * <div>
027 * Checks that interface type parameter names conform to a specified pattern.
028 * </div>
029 *
030 * @since 5.8
031 */
032public class InterfaceTypeParameterNameCheck
033    extends AbstractNameCheck {
034
035    /** Creates a new {@code InterfaceTypeParameterNameCheck} instance. */
036    public InterfaceTypeParameterNameCheck() {
037        super("^[A-Z]$");
038    }
039
040    @Override
041    public int[] getDefaultTokens() {
042        return getRequiredTokens();
043    }
044
045    @Override
046    public int[] getAcceptableTokens() {
047        return getRequiredTokens();
048    }
049
050    @Override
051    public int[] getRequiredTokens() {
052        return new int[] {
053            TokenTypes.TYPE_PARAMETER,
054        };
055    }
056
057    @Override
058    protected final boolean mustCheckName(DetailAST ast) {
059        final DetailAST location =
060            ast.getParent().getParent();
061        return location.getType() == TokenTypes.INTERFACE_DEF;
062    }
063
064}