Support show time in readable format

pom.xml

@@ -6,7 +6,7 @@
 
     <groupId>com.baidu.hugegraph</groupId>
     <artifactId>hugegraph-common</artifactId>
-    <version>1.6.7</version>
+    <version>1.6.8</version>
 
     <name>hugegraph-common</name>
     <url>https://github.com/hugegraph/hugegraph-common</url>
@@ -212,7 +212,7 @@
                         <manifestEntries>
                             <!-- Must be on one line, otherwise the automatic
                                  upgrade script cannot replace the version number -->
-                            <Implementation-Version>1.6.7.0</Implementation-Version>
+                            <Implementation-Version>1.6.8.0</Implementation-Version>
                         </manifestEntries>
                     </archive>
                 </configuration>

src/main/java/com/baidu/hugegraph/util/StringUtil.java

@@ -0,0 +1,40 @@
+/*
+ * Copyright 2017 HugeGraph Authors
+ *
+ * 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 com.baidu.hugegraph.util;
+
+import java.nio.CharBuffer;
+import java.util.ArrayList;
+import java.util.List;
+
+public final class StringUtil {
+
+    public static List<CharSequence> split(String line, String delimiter) {
+        E.checkArgument(delimiter.length() > 0,
+                        "The delimiter can't be empty");
+        List<CharSequence> results = new ArrayList<>();
+        int from = 0;
+        for (int to; (to = line.indexOf(delimiter, from)) >= 0;
+             from = to + delimiter.length()) {
+            results.add(CharBuffer.wrap(line, from, to));
+        }
+        results.add(CharBuffer.wrap(line, from, line.length()));
+        return results;
+    }
+}

src/main/java/com/baidu/hugegraph/util/TimeUtil.java

@@ -19,6 +19,7 @@
 
 package com.baidu.hugegraph.util;
 
+import java.time.Duration;
 import java.util.Date;
 
 public final class TimeUtil {
@@ -45,4 +46,12 @@ public static long tillNextMillis(long lastTimestamp) {
         }
         return timestamp;
     }
+
+    public static String readableTime(long time) {
+        Duration duration = Duration.ofMillis(time);
+        return duration.toString()
+                       .substring(2)
+                       .replaceAll("(\\d[HMS])(?!$)", "$1 ")
+                       .toLowerCase();
+    }
 }

src/main/java/com/baidu/hugegraph/version/CommonVersion.java

@@ -27,5 +27,5 @@ public class CommonVersion {
 
     // The second parameter of Version.of() is for all-in-one JAR
     public static final Version VERSION = Version.of(CommonVersion.class,
-                                                     "1.6.7");
+                                                     "1.6.8");
 }

src/test/java/com/baidu/hugegraph/unit/util/ReflectionUtilTest.java

@@ -91,7 +91,7 @@ public void testClasses() throws IOException {
         @SuppressWarnings("unchecked")
         List<ClassInfo> classes = IteratorUtils.toList(ReflectionUtil.classes(
                                   "com.baidu.hugegraph.util"));
-        Assert.assertEquals(14, classes.size());
+        Assert.assertEquals(15, classes.size());
         classes.sort((c1, c2) -> c1.getName().compareTo(c2.getName()));
         Assert.assertEquals("com.baidu.hugegraph.util.Bytes",
                             classes.get(0).getName());
@@ -100,7 +100,7 @@ public void testClasses() throws IOException {
         Assert.assertEquals("com.baidu.hugegraph.util.CollectionUtil",
                             classes.get(2).getName());
         Assert.assertEquals("com.baidu.hugegraph.util.VersionUtil",
-                            classes.get(13).getName());
+                            classes.get(14).getName());
     }
 
     @Test

src/test/java/com/baidu/hugegraph/unit/util/StringUtilTest.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright 2017 HugeGraph Authors
+ *
+ * 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 com.baidu.hugegraph.unit.util;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.junit.Test;
+
+import com.baidu.hugegraph.testutil.Assert;
+import com.baidu.hugegraph.util.StringUtil;
+import com.google.common.base.Splitter;
+
+public class StringUtilTest {
+
+    @Test
+    public void testSplit() {
+        Assert.assertEquals(guavaSplit("123", " "),
+                            toList(StringUtil.split("123", " ")));
+        Assert.assertEquals(guavaSplit("1 2 3", " "),
+                            toList(StringUtil.split("1 2 3", " ")));
+        Assert.assertEquals(guavaSplit("1:2:3", ":"),
+                            toList(StringUtil.split("1:2:3", ":")));
+        Assert.assertEquals(guavaSplit("1::2:3", ":"),
+                            toList(StringUtil.split("1::2:3", ":")));
+        Assert.assertEquals(guavaSplit("1::2::3", ":"),
+                            toList(StringUtil.split("1::2::3", ":")));
+        Assert.assertEquals(guavaSplit("1::2::3", "::"),
+                            toList(StringUtil.split("1::2::3", "::")));
+        Assert.assertEquals(guavaSplit("1:|2|:3", "|"),
+                            toList(StringUtil.split("1:|2|:3", "|")));
+        Assert.assertEquals(guavaSplit("1\t2\t3", "\t"),
+                            toList(StringUtil.split("1\t2\t3", "\t")));
+        Assert.assertEquals(guavaSplit("111", "1"),
+                            toList(StringUtil.split("111", "1")));
+
+        Assert.assertThrows(IllegalArgumentException.class, () -> {
+            StringUtil.split("123", "");
+        });
+    }
+
+    private static List<String> guavaSplit(String line, String delimiter) {
+        return Splitter.on(delimiter).splitToList(line);
+    }
+
+    private static List<String> toList(List<CharSequence> chars) {
+        List<String> results = new ArrayList<>(chars.size());
+        for (CharSequence seq : chars) {
+            results.add(seq.toString());
+        }
+        return results;
+    }
+}

src/test/java/com/baidu/hugegraph/unit/util/TimeUtilTest.java

@@ -60,4 +60,28 @@ public void testTillNextMillis() {
             Assert.assertNotEquals(lastTimestamp, time);
         }
     }
+
+    @Test
+    public void testReadableTime() {
+        Assert.assertEquals("0.001s", TimeUtil.readableTime(1));
+        Assert.assertEquals("0.999s", TimeUtil.readableTime(999));
+        Assert.assertEquals("1s", TimeUtil.readableTime(1000));
+        Assert.assertEquals("1.5s", TimeUtil.readableTime(1500));
+        Assert.assertEquals("15s", TimeUtil.readableTime(15 * 1000));
+        Assert.assertEquals("59.99s", TimeUtil.readableTime(59990));
+        Assert.assertEquals("1m", TimeUtil.readableTime(60000));
+        Assert.assertEquals("1m 0.1s", TimeUtil.readableTime(60000 + 100));
+        Assert.assertEquals("1m 1s", TimeUtil.readableTime(60000 + 1000));
+        Assert.assertEquals("59m", TimeUtil.readableTime(59 * 60 * 1000));
+        Assert.assertEquals("1h", TimeUtil.readableTime(60 * 60 * 1000));
+        Assert.assertEquals("23h 59m 59s", TimeUtil.readableTime(
+                                                    23 * 60 * 60 * 1000 +
+                                                    59 * 60 * 1000 +
+                                                    59 * 1000));
+        Assert.assertEquals("24h", TimeUtil.readableTime(24 * 60 * 60 * 1000));
+        Assert.assertEquals("25h 1m 1s", TimeUtil.readableTime(
+                                                    25 * 60 * 60 * 1000 +
+                                                    1 * 60 * 1000 +
+                                                    1 * 1000));
+    }
 }