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/*
* 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.
*/
package org.eclipse.aether.util.version;
import java.math.BigInteger;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.TreeMap;
import org.eclipse.aether.version.Version;
import static java.util.Objects.requireNonNull;
/**
* A generic version, that is a version that accepts any input string and tries to apply common sense sorting. See
* {@link GenericVersionScheme} for details.
*/
final class GenericVersion implements Version {
private final String version;
private final List- items;
private final int hash;
/**
* Creates a generic version from the specified string.
*
* @param version The version string, must not be {@code null}.
*/
GenericVersion(String version) {
this.version = requireNonNull(version, "version cannot be null");
items = parse(version);
hash = items.hashCode();
}
/**
* Returns this instance backing string representation.
*
* @since 1.9.5
*/
public String asString() {
return version;
}
/**
* Returns this instance tokenized representation as unmodifiable list.
*
* @since 1.9.5
*/
public List
- asItems() {
return items;
}
private static List
- parse(String version) {
List
- items = new ArrayList<>();
for (Tokenizer tokenizer = new Tokenizer(version); tokenizer.next(); ) {
Item item = tokenizer.toItem();
items.add(item);
}
trimPadding(items);
return Collections.unmodifiableList(items);
}
private static void trimPadding(List
- items) {
Boolean number = null;
int end = items.size() - 1;
for (int i = end; i > 0; i--) {
Item item = items.get(i);
if (!Boolean.valueOf(item.isNumber()).equals(number)) {
end = i;
number = item.isNumber();
}
if (end == i
&& (i == items.size() - 1 || items.get(i - 1).isNumber() == item.isNumber())
&& item.compareTo(null) == 0) {
items.remove(i);
end--;
}
}
}
@Override
public int compareTo(Version obj) {
final List
- these = items;
final List
- those = ((GenericVersion) obj).items;
boolean number = true;
for (int index = 0; ; index++) {
if (index >= these.size() && index >= those.size()) {
return 0;
} else if (index >= these.size()) {
return -comparePadding(those, index, null);
} else if (index >= those.size()) {
return comparePadding(these, index, null);
}
Item thisItem = these.get(index);
Item thatItem = those.get(index);
if (thisItem.isNumber() != thatItem.isNumber()) {
if (number == thisItem.isNumber()) {
return comparePadding(these, index, number);
} else {
return -comparePadding(those, index, number);
}
} else {
int rel = thisItem.compareTo(thatItem);
if (rel != 0) {
return rel;
}
number = thisItem.isNumber();
}
}
}
private static int comparePadding(List
- items, int index, Boolean number) {
int rel = 0;
for (int i = index; i < items.size(); i++) {
Item item = items.get(i);
if (number != null && number != item.isNumber()) {
// do not stop here, but continue, skipping non-number members
continue;
}
rel = item.compareTo(null);
if (rel != 0) {
break;
}
}
return rel;
}
@Override
public boolean equals(Object obj) {
return (obj instanceof GenericVersion) && compareTo((GenericVersion) obj) == 0;
}
@Override
public int hashCode() {
return hash;
}
@Override
public String toString() {
return version;
}
static final class Tokenizer {
private static final Integer QUALIFIER_ALPHA = -5;
private static final Integer QUALIFIER_BETA = -4;
private static final Integer QUALIFIER_MILESTONE = -3;
private static final Map
QUALIFIERS;
static {
QUALIFIERS = new TreeMap<>(String.CASE_INSENSITIVE_ORDER);
QUALIFIERS.put("alpha", QUALIFIER_ALPHA);
QUALIFIERS.put("beta", QUALIFIER_BETA);
QUALIFIERS.put("milestone", QUALIFIER_MILESTONE);
QUALIFIERS.put("cr", -2);
QUALIFIERS.put("rc", -2);
QUALIFIERS.put("snapshot", -1);
QUALIFIERS.put("ga", 0);
QUALIFIERS.put("final", 0);
QUALIFIERS.put("release", 0);
QUALIFIERS.put("", 0);
QUALIFIERS.put("sp", 1);
}
private final String version;
private final int versionLength;
private int index;
private String token;
private boolean number;
private boolean terminatedByNumber;
Tokenizer(String version) {
this.version = (version.length() > 0) ? version : "0";
this.versionLength = this.version.length();
}
public boolean next() {
if (index >= versionLength) {
return false;
}
int state = -2;
int start = index;
int end = versionLength;
terminatedByNumber = false;
for (; index < versionLength; index++) {
char c = version.charAt(index);
if (c == '.' || c == '-' || c == '_') {
end = index;
index++;
break;
} else {
int digit = Character.digit(c, 10);
if (digit >= 0) {
if (state == -1) {
end = index;
terminatedByNumber = true;
break;
}
if (state == 0) {
// normalize numbers and strip leading zeros (prereq for Integer/BigInteger handling)
start++;
}
state = (state > 0 || digit > 0) ? 1 : 0;
} else {
if (state >= 0) {
end = index;
break;
}
state = -1;
}
}
}
if (end - start > 0) {
token = version.substring(start, end);
number = state >= 0;
} else {
token = "0";
number = true;
}
return true;
}
@Override
public String toString() {
return String.valueOf(token);
}
public Item toItem() {
if (number) {
try {
if (token.length() < 10) {
return new Item(Item.KIND_INT, Integer.parseInt(token));
} else {
return new Item(Item.KIND_BIGINT, new BigInteger(token));
}
} catch (NumberFormatException e) {
throw new IllegalStateException(e);
}
} else {
if (index >= version.length()) {
if ("min".equalsIgnoreCase(token)) {
return Item.MIN;
} else if ("max".equalsIgnoreCase(token)) {
return Item.MAX;
}
}
if (terminatedByNumber && token.length() == 1) {
switch (token.charAt(0)) {
case 'a':
case 'A':
return new Item(Item.KIND_QUALIFIER, QUALIFIER_ALPHA);
case 'b':
case 'B':
return new Item(Item.KIND_QUALIFIER, QUALIFIER_BETA);
case 'm':
case 'M':
return new Item(Item.KIND_QUALIFIER, QUALIFIER_MILESTONE);
default:
}
}
Integer qualifier = QUALIFIERS.get(token);
if (qualifier != null) {
return new Item(Item.KIND_QUALIFIER, qualifier);
} else {
return new Item(Item.KIND_STRING, token.toLowerCase(Locale.ENGLISH));
}
}
}
}
static final class Item {
static final int KIND_MAX = 8;
static final int KIND_BIGINT = 5;
static final int KIND_INT = 4;
static final int KIND_STRING = 3;
static final int KIND_QUALIFIER = 2;
static final int KIND_MIN = 0;
static final Item MAX = new Item(KIND_MAX, "max");
static final Item MIN = new Item(KIND_MIN, "min");
private final int kind;
private final Object value;
Item(int kind, Object value) {
this.kind = kind;
this.value = value;
}
public boolean isNumber() {
return (kind & KIND_QUALIFIER) == 0; // i.e. kind != string/qualifier
}
public int compareTo(Item that) {
int rel;
if (that == null) {
// null in this context denotes the pad item (0 or "ga")
switch (kind) {
case KIND_MIN:
rel = -1;
break;
case KIND_MAX:
case KIND_BIGINT:
case KIND_STRING:
rel = 1;
break;
case KIND_INT:
case KIND_QUALIFIER:
rel = (Integer) value;
break;
default:
throw new IllegalStateException("unknown version item kind " + kind);
}
} else {
rel = kind - that.kind;
if (rel == 0) {
switch (kind) {
case KIND_MAX:
case KIND_MIN:
break;
case KIND_BIGINT:
rel = ((BigInteger) value).compareTo((BigInteger) that.value);
break;
case KIND_INT:
case KIND_QUALIFIER:
rel = ((Integer) value).compareTo((Integer) that.value);
break;
case KIND_STRING:
rel = ((String) value).compareToIgnoreCase((String) that.value);
break;
default:
throw new IllegalStateException("unknown version item kind " + kind);
}
}
}
return rel;
}
@Override
public boolean equals(Object obj) {
return (obj instanceof Item) && compareTo((Item) obj) == 0;
}
@Override
public int hashCode() {
return value.hashCode() + kind * 31;
}
@Override
public String toString() {
return String.valueOf(value);
}
}
}