org.sonar.duplications.benchmark.hash.AbstractHashBlockChunker.java Source code

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Here is the source code for org.sonar.duplications.benchmark.hash.AbstractHashBlockChunker.java

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/*
 * Sonar, open source software quality management tool.
 * Copyright (C) 2008-2011 SonarSource
 * mailto:contact AT sonarsource DOT com
 *
 * Sonar 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.
 *
 * Sonar 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 Sonar; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02
 */
package org.sonar.duplications.benchmark.hash;

import java.util.Collections;
import java.util.LinkedList;
import java.util.List;

import org.sonar.duplications.block.Block;
import org.sonar.duplications.block.BlockChunker;
import org.sonar.duplications.block.ByteArray;
import org.sonar.duplications.statement.Statement;

import com.google.common.collect.Lists;

public abstract class AbstractHashBlockChunker extends BlockChunker {

    public AbstractHashBlockChunker(int blockSize) {
        super(blockSize);
    }

    @Override
    public List<Block> chunk(String resourceId, List<Statement> statements) {
        if (statements.size() < getBlockSize()) {
            return Collections.emptyList();
        }

        LinkedList<Statement> statementsForBlock = new LinkedList<Statement>();
        List<Block> blocks = Lists.newArrayListWithCapacity(statements.size() - getBlockSize() + 1);

        for (Statement stmt : statements) {
            statementsForBlock.add(stmt);
            if (statementsForBlock.size() == getBlockSize()) {
                Statement firstStatement = statementsForBlock.getFirst();
                Statement lastStatement = statementsForBlock.getLast();
                blocks.add(new Block(resourceId, buildBlockHash(statementsForBlock), blocks.size(),
                        firstStatement.getStartLine(), lastStatement.getEndLine()));
                statementsForBlock.removeFirst();
            }
        }

        return blocks;
    }

    protected abstract ByteArray buildBlockHash(List<Statement> statements);

}