org.apache.maven.artifact.versioning.ComparableVersion Maven / Gradle / Ivy
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* 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.
*/
package org.apache.maven.artifact.versioning;
import java.math.BigInteger;
import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Deque;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;
import java.util.Properties;
/**
*
* Generic implementation of version comparison.
*
*
* Features:
*
* - mixing of '
-' (hyphen) and '.' (dot) separators,
* - transition between characters and digits also constitutes a separator:
*
1.0alpha1 => [1, 0, alpha, 1]
* - unlimited number of version components,
* - version components in the text can be digits or strings,
* - strings are checked for well-known qualifiers and the qualifier ordering is used for version ordering.
* Well-known qualifiers (case insensitive) are:
* alpha or abeta or bmilestone or mrc or crsnapshot(the empty string) or ga or finalsp
* Unknown qualifiers are considered after known qualifiers, with lexical order (always case insensitive),
*
* - a hyphen usually precedes a qualifier, and is always less important than digits/number, for example
* {@code 1.0.RC2 < 1.0-RC3 < 1.0.1}; but prefer {@code 1.0.0-RC1} over {@code 1.0.0.RC1}, and more
* generally: {@code 1.0.X2 < 1.0-X3 < 1.0.1} for any string {@code X}; but prefer {@code 1.0.0-X1}
* over {@code 1.0.0.X1}.
*
*
* @see "Versioning" on Maven Wiki
* @author Kenney Westerhof
* @author Hervé Boutemy
*/
public class ComparableVersion implements Comparable {
private static final int MAX_INTITEM_LENGTH = 9;
private static final int MAX_LONGITEM_LENGTH = 18;
private String value;
private String canonical;
private ListItem items;
private interface Item {
int INT_ITEM = 3;
int LONG_ITEM = 4;
int BIGINTEGER_ITEM = 0;
int STRING_ITEM = 1;
int LIST_ITEM = 2;
int compareTo(Item item);
int getType();
boolean isNull();
}
/**
* Represents a numeric item in the version item list that can be represented with an int.
*/
private static class IntItem implements Item {
private final int value;
public static final IntItem ZERO = new IntItem();
private IntItem() {
this.value = 0;
}
IntItem(String str) {
this.value = Integer.parseInt(str);
}
@Override
public int getType() {
return INT_ITEM;
}
@Override
public boolean isNull() {
return value == 0;
}
@Override
public int compareTo(Item item) {
if (item == null) {
return (value == 0) ? 0 : 1; // 1.0 == 1, 1.1 > 1
}
switch (item.getType()) {
case INT_ITEM:
int itemValue = ((IntItem) item).value;
return (value < itemValue) ? -1 : ((value == itemValue) ? 0 : 1);
case LONG_ITEM:
case BIGINTEGER_ITEM:
return -1;
case STRING_ITEM:
return 1; // 1.1 > 1-sp
case LIST_ITEM:
return 1; // 1.1 > 1-1
default:
throw new IllegalStateException("invalid item: " + item.getClass());
}
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
IntItem intItem = (IntItem) o;
return value == intItem.value;
}
@Override
public int hashCode() {
return value;
}
@Override
public String toString() {
return Integer.toString(value);
}
}
/**
* Represents a numeric item in the version item list that can be represented with a long.
*/
private static class LongItem implements Item {
private final long value;
LongItem(String str) {
this.value = Long.parseLong(str);
}
@Override
public int getType() {
return LONG_ITEM;
}
@Override
public boolean isNull() {
return value == 0;
}
@Override
public int compareTo(Item item) {
if (item == null) {
return (value == 0) ? 0 : 1; // 1.0 == 1, 1.1 > 1
}
switch (item.getType()) {
case INT_ITEM:
return 1;
case LONG_ITEM:
long itemValue = ((LongItem) item).value;
return (value < itemValue) ? -1 : ((value == itemValue) ? 0 : 1);
case BIGINTEGER_ITEM:
return -1;
case STRING_ITEM:
return 1; // 1.1 > 1-sp
case LIST_ITEM:
return 1; // 1.1 > 1-1
default:
throw new IllegalStateException("invalid item: " + item.getClass());
}
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
LongItem longItem = (LongItem) o;
return value == longItem.value;
}
@Override
public int hashCode() {
return (int) (value ^ (value >>> 32));
}
@Override
public String toString() {
return Long.toString(value);
}
}
/**
* Represents a numeric item in the version item list.
*/
private static class BigIntegerItem implements Item {
private final BigInteger value;
BigIntegerItem(String str) {
this.value = new BigInteger(str);
}
@Override
public int getType() {
return BIGINTEGER_ITEM;
}
@Override
public boolean isNull() {
return BigInteger.ZERO.equals(value);
}
@Override
public int compareTo(Item item) {
if (item == null) {
return BigInteger.ZERO.equals(value) ? 0 : 1; // 1.0 == 1, 1.1 > 1
}
switch (item.getType()) {
case INT_ITEM:
case LONG_ITEM:
return 1;
case BIGINTEGER_ITEM:
return value.compareTo(((BigIntegerItem) item).value);
case STRING_ITEM:
return 1; // 1.1 > 1-sp
case LIST_ITEM:
return 1; // 1.1 > 1-1
default:
throw new IllegalStateException("invalid item: " + item.getClass());
}
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
BigIntegerItem that = (BigIntegerItem) o;
return value.equals(that.value);
}
@Override
public int hashCode() {
return value.hashCode();
}
public String toString() {
return value.toString();
}
}
/**
* Represents a string in the version item list, usually a qualifier.
*/
private static class StringItem implements Item {
private static final List QUALIFIERS =
Arrays.asList("alpha", "beta", "milestone", "rc", "snapshot", "", "sp");
private static final Properties ALIASES = new Properties();
static {
ALIASES.put("ga", "");
ALIASES.put("final", "");
ALIASES.put("release", "");
ALIASES.put("cr", "rc");
}
/**
* A comparable value for the empty-string qualifier. This one is used to determine if a given qualifier makes
* the version older than one without a qualifier, or more recent.
*/
private static final String RELEASE_VERSION_INDEX = String.valueOf(QUALIFIERS.indexOf(""));
private final String value;
StringItem(String value, boolean followedByDigit) {
if (followedByDigit && value.length() == 1) {
// a1 = alpha-1, b1 = beta-1, m1 = milestone-1
switch (value.charAt(0)) {
case 'a':
value = "alpha";
break;
case 'b':
value = "beta";
break;
case 'm':
value = "milestone";
break;
default:
}
}
this.value = ALIASES.getProperty(value, value);
}
@Override
public int getType() {
return STRING_ITEM;
}
@Override
public boolean isNull() {
return (comparableQualifier(value).compareTo(RELEASE_VERSION_INDEX) == 0);
}
/**
* Returns a comparable value for a qualifier.
*
* This method takes into account the ordering of known qualifiers then unknown qualifiers with lexical
* ordering.
*
* just returning an Integer with the index here is faster, but requires a lot of if/then/else to check for -1
* or QUALIFIERS.size and then resort to lexical ordering. Most comparisons are decided by the first character,
* so this is still fast. If more characters are needed then it requires a lexical sort anyway.
*
* @param qualifier
* @return an equivalent value that can be used with lexical comparison
*/
public static String comparableQualifier(String qualifier) {
int i = QUALIFIERS.indexOf(qualifier);
return i == -1 ? (QUALIFIERS.size() + "-" + qualifier) : String.valueOf(i);
}
@Override
public int compareTo(Item item) {
if (item == null) {
// 1-rc < 1, 1-ga > 1
return comparableQualifier(value).compareTo(RELEASE_VERSION_INDEX);
}
switch (item.getType()) {
case INT_ITEM:
case LONG_ITEM:
case BIGINTEGER_ITEM:
return -1; // 1.any < 1.1 ?
case STRING_ITEM:
return comparableQualifier(value).compareTo(comparableQualifier(((StringItem) item).value));
case LIST_ITEM:
return -1; // 1.any < 1-1
default:
throw new IllegalStateException("invalid item: " + item.getClass());
}
}
@Override
public boolean equals(Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
StringItem that = (StringItem) o;
return value.equals(that.value);
}
@Override
public int hashCode() {
return value.hashCode();
}
public String toString() {
return value;
}
}
/**
* Represents a version list item. This class is used both for the global item list and for sub-lists (which start
* with '-(number)' in the version specification).
*/
private static class ListItem extends ArrayList- implements Item {
@Override
public int getType() {
return LIST_ITEM;
}
@Override
public boolean isNull() {
return (size() == 0);
}
void normalize() {
for (int i = size() - 1; i >= 0; i--) {
Item lastItem = get(i);
if (lastItem.isNull()) {
// remove null trailing items: 0, "", empty list
remove(i);
} else if (!(lastItem instanceof ListItem)) {
break;
}
}
}
@Override
public int compareTo(Item item) {
if (item == null) {
if (size() == 0) {
return 0; // 1-0 = 1- (normalize) = 1
}
// Compare the entire list of items with null - not just the first one, MNG-6964
for (Item i : this) {
int result = i.compareTo(null);
if (result != 0) {
return result;
}
}
return 0;
}
switch (item.getType()) {
case INT_ITEM:
case LONG_ITEM:
case BIGINTEGER_ITEM:
return -1; // 1-1 < 1.0.x
case STRING_ITEM:
return 1; // 1-1 > 1-sp
case LIST_ITEM:
Iterator
- left = iterator();
Iterator
- right = ((ListItem) item).iterator();
while (left.hasNext() || right.hasNext()) {
Item l = left.hasNext() ? left.next() : null;
Item r = right.hasNext() ? right.next() : null;
// if this is shorter, then invert the compare and mul with -1
int result = l == null ? (r == null ? 0 : -1 * r.compareTo(l)) : l.compareTo(r);
if (result != 0) {
return result;
}
}
return 0;
default:
throw new IllegalStateException("invalid item: " + item.getClass());
}
}
@Override
public String toString() {
StringBuilder buffer = new StringBuilder();
for (Item item : this) {
if (buffer.length() > 0) {
buffer.append((item instanceof ListItem) ? '-' : '.');
}
buffer.append(item);
}
return buffer.toString();
}
/**
* Return the contents in the same format that is used when you call toString() on a List.
*/
private String toListString() {
StringBuilder buffer = new StringBuilder();
buffer.append("[");
for (Item item : this) {
if (buffer.length() > 1) {
buffer.append(", ");
}
if (item instanceof ListItem) {
buffer.append(((ListItem) item).toListString());
} else {
buffer.append(item);
}
}
buffer.append("]");
return buffer.toString();
}
}
public ComparableVersion(String version) {
parseVersion(version);
}
@SuppressWarnings("checkstyle:innerassignment")
public final void parseVersion(String version) {
this.value = version;
items = new ListItem();
version = version.toLowerCase(Locale.ENGLISH);
ListItem list = items;
Deque
- stack = new ArrayDeque<>();
stack.push(list);
boolean isDigit = false;
int startIndex = 0;
for (int i = 0; i < version.length(); i++) {
char c = version.charAt(i);
if (c == '.') {
if (i == startIndex) {
list.add(IntItem.ZERO);
} else {
list.add(parseItem(isDigit, version.substring(startIndex, i)));
}
startIndex = i + 1;
} else if (c == '-') {
if (i == startIndex) {
list.add(IntItem.ZERO);
} else {
list.add(parseItem(isDigit, version.substring(startIndex, i)));
}
startIndex = i + 1;
list.add(list = new ListItem());
stack.push(list);
} else if (Character.isDigit(c)) {
if (!isDigit && i > startIndex) {
// 1.0.0.X1 < 1.0.0-X2
// treat .X as -X for any string qualifier X
if (!list.isEmpty()) {
list.add(list = new ListItem());
stack.push(list);
}
list.add(new StringItem(version.substring(startIndex, i), true));
startIndex = i;
list.add(list = new ListItem());
stack.push(list);
}
isDigit = true;
} else {
if (isDigit && i > startIndex) {
list.add(parseItem(true, version.substring(startIndex, i)));
startIndex = i;
list.add(list = new ListItem());
stack.push(list);
}
isDigit = false;
}
}
if (version.length() > startIndex) {
// 1.0.0.X1 < 1.0.0-X2
// treat .X as -X for any string qualifier X
if (!isDigit && !list.isEmpty()) {
list.add(list = new ListItem());
stack.push(list);
}
list.add(parseItem(isDigit, version.substring(startIndex)));
}
while (!stack.isEmpty()) {
list = (ListItem) stack.pop();
list.normalize();
}
}
private static Item parseItem(boolean isDigit, String buf) {
if (isDigit) {
buf = stripLeadingZeroes(buf);
if (buf.length() <= MAX_INTITEM_LENGTH) {
// lower than 2^31
return new IntItem(buf);
} else if (buf.length() <= MAX_LONGITEM_LENGTH) {
// lower than 2^63
return new LongItem(buf);
}
return new BigIntegerItem(buf);
}
return new StringItem(buf, false);
}
private static String stripLeadingZeroes(String buf) {
if (buf == null || buf.isEmpty()) {
return "0";
}
for (int i = 0; i < buf.length(); ++i) {
char c = buf.charAt(i);
if (c != '0') {
return buf.substring(i);
}
}
return buf;
}
@Override
public int compareTo(ComparableVersion o) {
return items.compareTo(o.items);
}
@Override
public String toString() {
return value;
}
public String getCanonical() {
if (canonical == null) {
canonical = items.toString();
}
return canonical;
}
@Override
public boolean equals(Object o) {
return (o instanceof ComparableVersion) && items.equals(((ComparableVersion) o).items);
}
@Override
public int hashCode() {
return items.hashCode();
}
// CHECKSTYLE_OFF: LineLength
/**
* Main to test version parsing and comparison.
*
* To check how "1.2.7" compares to "1.2-SNAPSHOT", for example, you can issue
*
java -jar ${maven.repo.local}/org/apache/maven/maven-artifact/${maven.version}/maven-artifact-${maven.version}.jar "1.2.7" "1.2-SNAPSHOT"
* command to command line. Result of given command will be something like this:
*
* Display parameters as parsed by Maven (in canonical form) and comparison result:
* 1. 1.2.7 == 1.2.7
* 1.2.7 > 1.2-SNAPSHOT
* 2. 1.2-SNAPSHOT == 1.2-snapshot
*
*
* @param args the version strings to parse and compare. You can pass arbitrary number of version strings and always
* two adjacent will be compared
*/
public static void main(String... args) {
System.out.println("Display parameters as parsed by Maven (in canonical form and as a list of tokens) and"
+ " comparison result:");
if (args.length == 0) {
return;
}
ComparableVersion prev = null;
int i = 1;
for (String version : args) {
ComparableVersion c = new ComparableVersion(version);
if (prev != null) {
int compare = prev.compareTo(c);
System.out.println(" " + prev.toString() + ' ' + ((compare == 0) ? "==" : ((compare < 0) ? "<" : ">"))
+ ' ' + version);
}
System.out.println(
(i++) + ". " + version + " -> " + c.getCanonical() + "; tokens: " + c.items.toListString());
prev = c;
}
}
// CHECKSTYLE_ON: LineLength
}
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