org.sonar.java.syntaxtoken.LastSyntaxTokenFinder.java Source code

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Here is the source code for org.sonar.java.syntaxtoken.LastSyntaxTokenFinder.java

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/*
 * SonarQube Java
 * Copyright (C) 2012-2016 SonarSource SA
 * mailto:contact AT sonarsource DOT com
 *
 * This program 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.
 *
 * This program 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 program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.java.syntaxtoken;

import com.google.common.collect.Lists;
import org.sonar.java.model.JavaTree;
import org.sonar.plugins.java.api.tree.SyntaxToken;
import org.sonar.plugins.java.api.tree.Tree;

import javax.annotation.Nullable;
import java.util.ArrayList;

public class LastSyntaxTokenFinder {

    private LastSyntaxTokenFinder() {
    }

    @Nullable
    public static SyntaxToken lastSyntaxToken(@Nullable Tree tree) {
        if (tree == null || tree.is(Tree.Kind.INFERED_TYPE)) {
            return null;
        } else if (tree.is(Tree.Kind.TOKEN)) {
            return (SyntaxToken) tree;
        }
        ArrayList<Tree> childrenAsList = Lists.newArrayList(((JavaTree) tree).children());
        for (Tree next : Lists.reverse(childrenAsList)) {
            SyntaxToken syntaxToken = lastSyntaxToken(next);
            if (syntaxToken != null) {
                return syntaxToken;
            }
        }
        return null;
    }
}