InnerClassCheck.java

////////////////////////////////////////////////////////////////////////////////
// checkstyle: Checks Java source code for adherence to a set of rules.
// Copyright (C) 2001-2019 the original author or authors.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
////////////////////////////////////////////////////////////////////////////////

package com.github.sevntu.checkstyle.checks.design;

import com.puppycrawl.tools.checkstyle.api.AbstractCheck;
import com.puppycrawl.tools.checkstyle.api.DetailAST;
import com.puppycrawl.tools.checkstyle.api.TokenTypes;

/**
 * <p>
 * Check nested (internal) classes to be declared at the bottom of the class
 * after all methods (fields) declaration.
 * </p>
 *
 * @author <a href="mailto:ryly@mail.ru">Ruslan Dyachenko</a>
 * @since 1.8.0
 */
public class InnerClassCheck extends AbstractCheck {

    /**
     * Warning message key.
     */
    public static final String MSG_KEY = "arrangement.members.before.inner";

    /** Meet a root class. */
    private boolean rootClass = true;

    @Override
    public int[] getDefaultTokens() {
        return new int[] {
            TokenTypes.CLASS_DEF,
        };
    }

    @Override
    public int[] getAcceptableTokens() {
        return getDefaultTokens();
    }

    @Override
    public int[] getRequiredTokens() {
        return getDefaultTokens();
    }

    @Override
    public void visitToken(DetailAST ast) {
        // First root class
        if (rootClass) {
            rootClass = false;
        }
        else {
            DetailAST nextSibling = ast.getNextSibling();
            while (nextSibling != null
                    && nextSibling.getType() != TokenTypes.CLASS_DEF) {
                if (nextSibling.getType() == TokenTypes.VARIABLE_DEF
                        || nextSibling.getType() == TokenTypes.METHOD_DEF) {
                    log(nextSibling, MSG_KEY);
                }
                nextSibling = nextSibling.getNextSibling();
            }
        }
    }

    @Override
    public void leaveToken(DetailAST ast) {
        // Is this a root class
        if (ast.getParent() == null) {
            rootClass = true;
        }
    }

}