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Checkstyle is a development tool to help programmers write Java code that adheres to a coding standard
There is a newer version: 10.18.1
////////////////////////////////////////////////////////////////////////////////
// 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.puppycrawl.tools.checkstyle.api;

/**
 * A interface of Checkstyle's AST nodes for traversing trees generated from the
 * Java code. The main purpose of this interface is to abstract away ANTLR
 * specific classes from API package so other libraries won't require it.
 *
 * @see ANTLR Website
 */
public interface DetailAST {

    /**
     * Returns the number of child nodes one level below this node. That is is
     * does not recurse down the tree.
     * @return the number of child nodes
     */
    int getChildCount();

    /**
     * Returns the number of direct child tokens that have the specified type.
     * @param type the token type to match
     * @return the number of matching token
     */
    int getChildCount(int type);

    /**
     * Returns the parent token.
     * @return the parent token
     */
    DetailAST getParent();

    /**
     * Gets the text of this AST.
     * @return the text.
     */
    String getText();

    /**
     * Gets the type of this AST.
     * @return the type.
     */
    int getType();

    /**
     * Gets line number.
     * @return the line number
     */
    int getLineNo();

    /**
     * Gets column number.
     * @return the column number
     */
    int getColumnNo();

    /**
     * Gets the last child node.
     * @return the last child node
     */
    DetailAST getLastChild();

    /**
     * Checks if this branch of the parse tree contains a token
     * of the provided type.
     * @param type a TokenType
     * @return true if and only if this branch (including this node)
     *     contains a token of type {@code type}.
     */
    boolean branchContains(int type);

    /**
     * Returns the previous sibling or null if no such sibling exists.
     * @return the previous sibling or null if no such sibling exists.
     */
    DetailAST getPreviousSibling();

    /**
     * Returns the first child token that makes a specified type.
     * @param type the token type to match
     * @return the matching token, or null if no match
     */
    DetailAST findFirstToken(int type);

    /**
     * Get the next sibling in line after this one.
     * @return the next sibling or null if none.
     */
    DetailAST getNextSibling();

    /**
     * Get the first child of this AST.
     * @return the first child or null if none.
     */
    DetailAST getFirstChild();

    /**
     * Get number of children of this AST.
     * @return the number of children.
     */
    int getNumberOfChildren();

}