/*
 * Copyright (C) 2007 Júlio Vilmar Gesser.
 *
 * This file is part of Java 1.5 parser and Abstract Syntax Tree.
 *
 * Java 1.5 parser and Abstract Syntax Tree 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 3 of the License, or
 * (at your option) any later version.
 *
 * Java 1.5 parser and Abstract Syntax Tree 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 Java 1.5 parser and Abstract Syntax Tree.  If not, see <http://www.gnu.org/licenses/>.
 */
/*
 * Created on 05/10/2006
 */
package org.checkerframework.stubparser.ast;

/*>>>
import org.checkerframework.dataflow.qual.Pure;
import org.checkerframework.dataflow.qual.SideEffectFree;
*/

import org.checkerframework.stubparser.ast.visitor.DumpVisitor;
import org.checkerframework.stubparser.ast.visitor.EqualsVisitor;
import org.checkerframework.stubparser.ast.visitor.GenericVisitor;
import org.checkerframework.stubparser.ast.visitor.VoidVisitor;

/**
 * Abstract class for all nodes of the AST.
 *
 * @author Julio Vilmar Gesser
 */
public abstract class Node {

    private int beginLine;

    private int beginColumn;

    private int endLine;

    private int endColumn;

    /**
     * This attribute can store additional information from semantic analysis.
     */
    private Object data;

    public Node() {
    }

    public Node(int beginLine, int beginColumn, int endLine, int endColumn) {
        this.beginLine = beginLine;
        this.beginColumn = beginColumn;
        this.endLine = endLine;
        this.endColumn = endColumn;
    }

    /**
     * Accept method for visitor support.
     *
     * @param <R>
     *            the type the return value of the visitor
     * @param <A>
     *            the type the argument passed for the visitor
     * @param v
     *            the visitor implementation
     * @param arg
     *            any value relevant for the visitor
     * @return the result of the visit
     */
    public abstract <R, A> R accept(GenericVisitor<R, A> v, A arg);

    /**
     * Accept method for visitor support.
     *
     * @param <A>
     *            the type the argument passed for the visitor
     * @param v
     *            the visitor implementation
     * @param arg
     *            any value relevant for the visitor
     */
    public abstract <A> void accept(VoidVisitor<A> v, A arg);

    /**
     * Return the begin column of this node.
     *
     * @return the begin column of this node
     */
    public final int getBeginColumn() {
        return beginColumn;
    }

    /**
     * Return the begin line of this node.
     *
     * @return the begin line of this node
     */
    public final int getBeginLine() {
        return beginLine;
    }

    /**
     * Use this to retrieve additional information associated to this node.
     */
    public final Object getData() {
        return data;
    }

    /**
     * Return the end column of this node.
     *
     * @return the end column of this node
     */
    public final int getEndColumn() {
        return endColumn;
    }

    /**
     * Return the end line of this node.
     *
     * @return the end line of this node
     */
    public final int getEndLine() {
        return endLine;
    }

    /**
     * Sets the begin column of this node.
     *
     * @param beginColumn
     *            the begin column of this node
     */
    public final void setBeginColumn(int beginColumn) {
        this.beginColumn = beginColumn;
    }

    /**
     * Sets the begin line of this node.
     *
     * @param beginLine
     *            the begin line of this node
     */
    public final void setBeginLine(int beginLine) {
        this.beginLine = beginLine;
    }

    /**
     * Use this to store additional information to this node.
     */
    public final void setData(Object data) {
        this.data = data;
    }

    /**
     * Sets the end column of this node.
     *
     * @param endColumn
     *            the end column of this node
     */
    public final void setEndColumn(int endColumn) {
        this.endColumn = endColumn;
    }

    /**
     * Sets the end line of this node.
     *
     * @param endLine
     *            the end line of this node
     */
    public final void setEndLine(int endLine) {
        this.endLine = endLine;
    }

    /**
     * Return the String representation of this node.
     *
     * @return the String representation of this node
     */
    /*@SideEffectFree*/
    @Override
    public final String toString() {
        DumpVisitor visitor = new DumpVisitor();
        accept(visitor, null);
        return visitor.getSource();
    }

    /*@Pure*/
    @Override
    public final int hashCode() {
        return toString().hashCode();
    }

    @Override
    public boolean equals(Object obj) {
        return EqualsVisitor.equals(this, (Node) obj);
    }

}