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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.apache.parquet;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Very basic semver parser, only pays attention to major, minor, and patch numbers.
* Attempts to do a little bit of validation that the version string is valid, but
* is not a full implementation of the semver spec.
*
* NOTE: compareTo only respects major, minor, patch, and whether this is a
* prerelease version. All prerelease versions are considered equivalent.
*/
public final class SemanticVersion implements Comparable {
// this is slightly more permissive than the semver format:
// * it allows a pattern after patch and before -prerelease or +buildinfo
private static final String FORMAT =
// major . minor .patch ??? - prerelease.x + build info
"^(\\d+)\\.(\\d+)\\.(\\d+)([^-+]*)?(?:-([^+]*))?(?:\\+(.*))?$";
private static final Pattern PATTERN = Pattern.compile(FORMAT);
public final int major;
public final int minor;
public final int patch;
// this is part of the public API and can't be renamed. it is misleading
// because it actually signals that there is an unknown component
public final boolean prerelease;
public final String unknown;
public final Prerelease pre;
public final String buildInfo;
public SemanticVersion(int major, int minor, int patch) {
Preconditions.checkArgument(major >= 0, "major must be >= 0");
Preconditions.checkArgument(minor >= 0, "minor must be >= 0");
Preconditions.checkArgument(patch >= 0, "patch must be >= 0");
this.major = major;
this.minor = minor;
this.patch = patch;
this.prerelease = false;
this.unknown = null;
this.pre = null;
this.buildInfo = null;
}
public SemanticVersion(int major, int minor, int patch, boolean hasUnknown) {
Preconditions.checkArgument(major >= 0, "major must be >= 0");
Preconditions.checkArgument(minor >= 0, "minor must be >= 0");
Preconditions.checkArgument(patch >= 0, "patch must be >= 0");
this.major = major;
this.minor = minor;
this.patch = patch;
this.prerelease = hasUnknown;
this.unknown = null;
this.pre = null;
this.buildInfo = null;
}
public SemanticVersion(int major, int minor, int patch, String unknown, String pre, String buildInfo) {
Preconditions.checkArgument(major >= 0, "major must be >= 0");
Preconditions.checkArgument(minor >= 0, "minor must be >= 0");
Preconditions.checkArgument(patch >= 0, "patch must be >= 0");
this.major = major;
this.minor = minor;
this.patch = patch;
this.prerelease = (unknown != null && !unknown.isEmpty());
this.unknown = unknown;
this.pre = (pre != null ? new Prerelease(pre) : null);
this.buildInfo = buildInfo;
}
public static SemanticVersion parse(String version) throws SemanticVersionParseException {
Matcher matcher = PATTERN.matcher(version);
if (!matcher.matches()) {
throw new SemanticVersionParseException("" + version + " does not match format " + FORMAT);
}
final int major;
final int minor;
final int patch;
try {
major = Integer.valueOf(matcher.group(1));
minor = Integer.valueOf(matcher.group(2));
patch = Integer.valueOf(matcher.group(3));
} catch (NumberFormatException e) {
throw new SemanticVersionParseException(e);
}
final String unknown = matcher.group(4);
final String prerelease = matcher.group(5);
final String buildInfo = matcher.group(6);
if (major < 0 || minor < 0 || patch < 0) {
throw new SemanticVersionParseException(
String.format("major(%d), minor(%d), and patch(%d) must all be >= 0", major, minor, patch));
}
return new SemanticVersion(major, minor, patch, unknown, prerelease, buildInfo);
}
@Override
public int compareTo(SemanticVersion o) {
int cmp;
cmp = compareIntegers(major, o.major);
if (cmp != 0) {
return cmp;
}
cmp = compareIntegers(minor, o.minor);
if (cmp != 0) {
return cmp;
}
cmp = compareIntegers(patch, o.patch);
if (cmp != 0) {
return cmp;
}
cmp = compareBooleans(o.prerelease, prerelease);
if (cmp != 0) {
return cmp;
}
if (pre != null) {
if (o.pre != null) {
return pre.compareTo(o.pre);
} else {
return -1;
}
} else if (o.pre != null) {
return 1;
}
return 0;
}
private static int compareIntegers(int x, int y) {
return (x < y) ? -1 : ((x == y) ? 0 : 1);
}
private static int compareBooleans(boolean x, boolean y) {
return (x == y) ? 0 : (x ? 1 : -1);
}
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
SemanticVersion that = (SemanticVersion) o;
return compareTo(that) == 0;
}
@Override
public int hashCode() {
int result = major;
result = 31 * result + minor;
result = 31 * result + patch;
return result;
}
@Override
public String toString() {
StringBuilder sb = new StringBuilder();
sb.append(major).append(".").append(minor).append(".").append(patch);
if (prerelease) {
sb.append(unknown);
}
if (pre != null) {
sb.append(pre.original);
}
if (buildInfo != null) {
sb.append(buildInfo);
}
return sb.toString();
}
private static class NumberOrString implements Comparable {
private static final Pattern NUMERIC = Pattern.compile("\\d+");
private final String original;
private final boolean isNumeric;
private final int number;
public NumberOrString(String numberOrString) {
this.original = numberOrString;
this.isNumeric = NUMERIC.matcher(numberOrString).matches();
if (isNumeric) {
this.number = Integer.parseInt(numberOrString);
} else {
this.number = -1;
}
}
@Override
public int compareTo(NumberOrString that) {
// Numeric identifiers always have lower precedence than non-numeric identifiers.
int cmp = compareBooleans(that.isNumeric, this.isNumeric);
if (cmp != 0) {
return cmp;
}
if (isNumeric) {
// identifiers consisting of only digits are compared numerically
return compareIntegers(this.number, that.number);
}
// identifiers with letters or hyphens are compared lexically in ASCII sort order
return this.original.compareTo(that.original);
}
@Override
public String toString() {
return original;
}
}
private static class Prerelease implements Comparable {
private static final Pattern DOT = Pattern.compile("\\.");
private final String original;
private final List identifiers = new ArrayList();
public Prerelease(String original) {
this.original = original;
for (String identifier : DOT.split(original)) {
identifiers.add(new NumberOrString(identifier));
}
}
@Override
public int compareTo(Prerelease that) {
// A larger set of pre-release fields has a higher precedence than a
// smaller set, if all of the preceding identifiers are equal
int size = Math.min(this.identifiers.size(), that.identifiers.size());
for (int i = 0; i < size; i += 1) {
int cmp = identifiers.get(i).compareTo(that.identifiers.get(i));
if (cmp != 0) {
return cmp;
}
}
return compareIntegers(this.identifiers.size(), that.identifiers.size());
}
@Override
public String toString() {
return original;
}
}
public static class SemanticVersionParseException extends Exception {
public SemanticVersionParseException() {
super();
}
public SemanticVersionParseException(String message) {
super(message);
}
public SemanticVersionParseException(String message, Throwable cause) {
super(message, cause);
}
public SemanticVersionParseException(Throwable cause) {
super(cause);
}
}
}
