/*
 * Contributions to FindBugs
 * Copyright (C) 2006, Institut for Software
 * An Institut of the University of Applied Sciences Rapperswil
 *
 * Author: Marco Busarello, Thierry Wyss
 *
 * 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 edu.umd.cs.findbugs.plugin.eclipse.quickfix;

import static edu.umd.cs.findbugs.plugin.eclipse.quickfix.util.ASTUtil.getASTNode;

import org.eclipse.core.runtime.Assert;
import org.eclipse.jdt.core.dom.ASTNode;
import org.eclipse.jdt.core.dom.CompilationUnit;
import org.eclipse.jdt.core.dom.Statement;
import org.eclipse.jdt.core.dom.rewrite.ASTRewrite;

import edu.umd.cs.findbugs.BugInstance;
import edu.umd.cs.findbugs.plugin.eclipse.quickfix.exception.BugResolutionException;

/**
 * Statements that are useless should be removed from the code. The
 * <CODE>RemoveUselessStatementResolution</CODE> removes such statements.
 *
 * @see <a
 *      href="http://findbugs.sourceforge.net/bugDescriptions.html#SA_FIELD_SELF_ASSIGNMENT">SA_FIELD_SELF_ASSIGNMENT</a>
 * @see <a
 *      href="http://findbugs.sourceforge.net/bugDescriptions.html#SA_LOCAL_SELF_ASSIGNMENT">SA_LOCAL_SELF_ASSIGNMENT</a>
 * @author <a href="mailto:mbusarel@hsr.ch">Marco Busarello</a>
 * @author <a href="mailto:twyss@hsr.ch">Thierry Wyss</a>
 * @version 1.0
 */
public class RemoveUselessStatementResolution extends BugResolution {

    @Override
    protected void repairBug(ASTRewrite rewrite, CompilationUnit workingUnit, BugInstance bug) throws BugResolutionException {
        Assert.isNotNull(rewrite);
        Assert.isNotNull(workingUnit);
        Assert.isNotNull(bug);

        Statement statement = findUselessStatement(getASTNode(workingUnit, bug.getPrimarySourceLineAnnotation()));
        rewrite.remove(statement, null);
    }

    private Statement findUselessStatement(ASTNode node) {
        if (node instanceof Statement) {
            return (Statement) node;
        }
        return null;
    }

    @Override
    protected boolean resolveBindings() {
        return false;
    }

}