org.hudsonci.maven.plugin.builder.internal.MavenVersionParser Maven / Gradle / Ivy

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/**
 * The MIT License
 *
 * Copyright (c) 2010-2011 Sonatype, Inc. All rights reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

package org.hudsonci.maven.plugin.builder.internal;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.StringReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * Parse Maven version from mvn --version output.
 *
 * @author Jason Dillon
 * @since 2.1.0
 */
public class MavenVersionParser
{
    // FIXME: This expression is still not specific enough
    private static final Pattern MAVEN_VERSION = Pattern.compile("(?i).*Maven [^0-9]*([0-9]\\S*).*");

    public String parse(final BufferedReader reader) throws IOException {
        checkNotNull(reader);
        String line;
        while ((line = reader.readLine()) != null) {
            Matcher m = MAVEN_VERSION.matcher(line);
            if (m.matches()) {
                // First match wins.
                return m.group(1);
            }
        }

        return null;
    }

    public String parse(final String text) throws IOException {
        checkNotNull(text);
        return parse(new BufferedReader(new StringReader(text)));
    }
}