org.codeqinvest.codechanges.scm.svn.SvnFileRetrieverService.java Source code

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Here is the source code for org.codeqinvest.codechanges.scm.svn.SvnFileRetrieverService.java

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/*
 * Copyright 2013 - 2014 Felix Mller
 *
 * This file is part of CodeQ Invest.
 *
 * CodeQ Invest is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * CodeQ Invest 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with CodeQ Invest.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.codeqinvest.codechanges.scm.svn;

import lombok.extern.slf4j.Slf4j;
import org.codeqinvest.codechanges.scm.ScmConnectionSettings;
import org.springframework.stereotype.Service;
import org.tmatesoft.svn.core.SVNException;
import org.tmatesoft.svn.core.SVNProperties;
import org.tmatesoft.svn.core.SVNProperty;

import java.io.ByteArrayOutputStream;
import java.io.UnsupportedEncodingException;

/**
 * This service retrieves files from a svn repository in a
 * certain revision.
 *
 * @author fmueller
 */
@Slf4j
@Service
class SvnFileRetrieverService {

    private static final String DEFAULT_LINE_SEPARATOR = "\n";

    /**
     * Loads a given version (revision) of a file from a svn server.
     *
     * @return the loaded file from the svn server
     * @throws SVNException                 if errors occur during communication with the svn server
     * @throws UnsupportedEncodingException if the read bytes cannot be converted to string with encoding supplied by {@code connectionSettings}
     */
    SvnFile getFile(ScmConnectionSettings connectionSettings, String file, long revision)
            throws SVNException, UnsupportedEncodingException {
        ByteArrayOutputStream content = new ByteArrayOutputStream();
        SVNProperties properties = new SVNProperties();
        SvnRepositoryFactory.create(connectionSettings).getFile(file, revision, properties, content);

        final String eolStyle = properties.getStringValue(SVNProperty.EOL_STYLE);
        final String fileContent = new String(content.toByteArray(), connectionSettings.getEncoding());
        log.debug("Retrieved revision {} of file {} ({} bytes, eol = {}) from subversion", revision, file,
                content.size(), eolStyle);
        return new SvnFile(fileContent, getLineSeparator(eolStyle));
    }

    private String getLineSeparator(String eolStyle) {
        if (eolStyle != null) {
            if (eolStyle.equals(SVNProperty.EOL_STYLE_CR)) {
                return "\r";
            } else if (eolStyle.equals(SVNProperty.EOL_STYLE_LF)) {
                return "\n";
            } else if (eolStyle.equals(SVNProperty.EOL_STYLE_CRLF)) {
                return "\r\n";
            }
        }
        return DEFAULT_LINE_SEPARATOR;
    }
}