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/*******************************************************************************
 *
 * Copyright (c) 2010-2011 Sonatype, Inc.
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors: 
 *
 *   
 *     
 *
 *******************************************************************************/ 

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)));
    }
}