DefaultArtifactVersion.java

package krasa.mavenrun.analyzer;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.StringTokenizer;

/**
 * http://grepcode.com/file_/repo1.maven.org/maven2/org.apache.maven/maven-artifact/3.1.1/org/apache/maven/artifact/
 * versioning/DefaultArtifactVersion.java/?v=source
 * <p/>
 * Default implementation of artifact versioning.
 * 
 * @author <a href="mailto:brett@apache.org">Brett Porter</a>
 */
public class DefaultArtifactVersion {
	private Integer majorVersion;

	private Integer minorVersion;

	private Integer incrementalVersion;

	private Integer buildNumber;

	private String qualifier;

	private ComparableVersion comparable;

	public DefaultArtifactVersion(String version) {
		parseVersion(version);
	}

	@Override
	public int hashCode() {
		return 11 + comparable.hashCode();
	}

	@Override
	public boolean equals(Object other) {
		if (this == other) {
			return true;
		}

		if (!(other instanceof DefaultArtifactVersion)) {
			return false;
		}

		return compareTo((DefaultArtifactVersion) other) == 0;
	}

	public int compareTo(DefaultArtifactVersion otherVersion) {
		if (otherVersion instanceof DefaultArtifactVersion) {
			return this.comparable.compareTo(((DefaultArtifactVersion) otherVersion).comparable);
		} else {
			return compareTo(new DefaultArtifactVersion(otherVersion.toString()));
		}
	}

	public int getMajorVersion() {
		return majorVersion != null ? majorVersion : 0;
	}

	public int getMinorVersion() {
		return minorVersion != null ? minorVersion : 0;
	}

	public int getIncrementalVersion() {
		return incrementalVersion != null ? incrementalVersion : 0;
	}

	public int getBuildNumber() {
		return buildNumber != null ? buildNumber : 0;
	}

	public String getQualifier() {
		return qualifier;
	}

	public final void parseVersion(String version) {
		comparable = new ComparableVersion(version);

		int index = version.indexOf("-");

		String part1;
		String part2 = null;

		if (index < 0) {
			part1 = version;
		} else {
			part1 = version.substring(0, index);
			part2 = version.substring(index + 1);
		}

		if (part2 != null) {
			try {
				if ((part2.length() == 1) || !part2.startsWith("0")) {
					buildNumber = Integer.valueOf(part2);
				} else {
					qualifier = part2;
				}
			} catch (NumberFormatException e) {
				qualifier = part2;
			}
		}

		if ((!part1.contains(".")) && !part1.startsWith("0")) {
			try {
				majorVersion = Integer.valueOf(part1);
			} catch (NumberFormatException e) {
				// qualifier is the whole version, including "-"
				qualifier = version;
				buildNumber = null;
			}
		} else {
			boolean fallback = false;

			StringTokenizer tok = new StringTokenizer(part1, ".");
			try {
				majorVersion = getNextIntegerToken(tok);
				if (tok.hasMoreTokens()) {
					minorVersion = getNextIntegerToken(tok);
				}
				if (tok.hasMoreTokens()) {
					incrementalVersion = getNextIntegerToken(tok);
				}
				if (tok.hasMoreTokens()) {
					fallback = true;
				}

				// string tokenzier won't detect these and ignores them
				if (part1.contains("..") || part1.startsWith(".") || part1.endsWith(".")) {
					fallback = true;
				}
			} catch (NumberFormatException e) {
				fallback = true;
			}

			if (fallback) {
				// qualifier is the whole version, including "-"
				qualifier = version;
				majorVersion = null;
				minorVersion = null;
				incrementalVersion = null;
				buildNumber = null;
			}
		}
	}

	private static Integer getNextIntegerToken(StringTokenizer tok) {
		String s = tok.nextToken();
		if ((s.length() > 1) && s.startsWith("0")) {
			throw new NumberFormatException("Number part has a leading 0: '" + s + "'");
		}
		return Integer.valueOf(s);
	}

	@Override
	public String toString() {
		StringBuilder buf = new StringBuilder();
		if (majorVersion != null) {
			buf.append(majorVersion);
		}
		if (minorVersion != null) {
			buf.append(".");
			buf.append(minorVersion);
		}
		if (incrementalVersion != null) {
			buf.append(".");
			buf.append(incrementalVersion);
		}
		if (buildNumber != null) {
			buf.append("-");
			buf.append(buildNumber);
		} else if (qualifier != null) {
			if (buf.length() > 0) {
				buf.append("-");
			}
			buf.append(qualifier);
		}
		return buf.toString();
	}
}