src/jdk.jpackage/share/classes/jdk/jpackage/internal/DottedVersion.java
branchJDK-8200758-branch
changeset 58696 61c44899b4eb
child 58890 6539ad1d90aa
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/jdk.jpackage/share/classes/jdk/jpackage/internal/DottedVersion.java	Fri Oct 18 14:14:37 2019 -0400
@@ -0,0 +1,101 @@
+/*
+ * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.  Oracle designates this
+ * particular file as subject to the "Classpath" exception as provided
+ * by Oracle in the LICENSE file that accompanied this code.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+
+package jdk.jpackage.internal;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * Dotted numeric version string.
+ * E.g.: 1.0.37, 10, 0.5
+ */
+class DottedVersion implements Comparable<String> {
+
+    public DottedVersion(String version) {
+        components = parseVersionString(version);
+        value = version;
+    }
+
+    @Override
+    public int compareTo(String o) {
+        int result = 0;
+        int[] otherComponents = parseVersionString(o);
+        for (int i = 0; i < Math.min(components.length, otherComponents.length)
+                && result == 0; ++i) {
+            result = components[i] - otherComponents[i];
+        }
+
+        if (result == 0) {
+            result = components.length - otherComponents.length;
+        }
+
+        return result;
+    }
+
+    private static int[] parseVersionString(String version) {
+        Objects.requireNonNull(version);
+        if (version.isEmpty()) {
+            throw new IllegalArgumentException("Version may not be empty string");
+        }
+
+        int lastNotZeroIdx = -1;
+        List<Integer> components = new ArrayList<>();
+        for (var component : version.split("\\.", -1)) {
+            if (component.isEmpty()) {
+                throw new IllegalArgumentException(String.format(
+                        "Version [%s] contains a zero lenght component", version));
+            }
+
+            int num = Integer.parseInt(component);
+            if (num < 0) {
+                throw new IllegalArgumentException(String.format(
+                        "Version [%s] contains invalid component [%s]", version,
+                        component));
+            }
+
+            if (num != 0) {
+                lastNotZeroIdx = components.size();
+            }
+            components.add(num);
+        }
+
+        if (lastNotZeroIdx + 1 != components.size()) {
+            // Strip trailing zeros.
+            components = components.subList(0, lastNotZeroIdx + 1);
+        }
+
+        return components.stream().mapToInt(Integer::intValue).toArray();
+    }
+
+    @Override
+    public String toString() {
+        return value;
+    }
+
+    final private int[] components;
+    final private String value;
+}