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[lgpl/argeo-commons.git] / org.argeo.util / src / org / argeo / util / LangUtils.java

diff --git a/org.argeo.util/src/org/argeo/util/LangUtils.java b/org.argeo.util/src/org/argeo/util/LangUtils.java
index 3c0baed1c8047ad0c9cccb10a77c12a84def8912..b791f490d10dbf1146450d3b17a7eeac08927bdc 100644 (file)
--- a/org.argeo.util/src/org/argeo/util/LangUtils.java
+++ b/org.argeo.util/src/org/argeo/util/LangUtils.java
@@ -7,6 +7,9 @@ import java.io.Writer;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.nio.file.StandardOpenOption;
+import java.time.ZonedDateTime;
+import java.time.temporal.ChronoUnit;
+import java.time.temporal.Temporal;
 import java.util.Dictionary;
 import java.util.Enumeration;
 import java.util.Hashtable;
@@ -38,7 +41,7 @@ public class LangUtils {
         * Creates a new {@link Dictionary} with one key-value pair (neither key not
         * value should be null)
         */
-       public static Dictionary<String, Object> init(String key, Object value) {
+       public static Dictionary<String, Object> dico(String key, Object value) {
                assert key != null;
                assert value != null;
                Hashtable<String, Object> props = new Hashtable<>();
@@ -54,11 +57,11 @@ public class LangUtils {
                return new DictionaryKeys(props);
        }
 
-       public static String toJson(Dictionary<String, ?> props) {
+       static String toJson(Dictionary<String, ?> props) {
                return toJson(props, false);
        }
 
-       public static String toJson(Dictionary<String, ?> props, boolean pretty) {
+       static String toJson(Dictionary<String, ?> props, boolean pretty) {
                StringBuilder sb = new StringBuilder();
                sb.append('{');
                if (pretty)
@@ -83,7 +86,7 @@ public class LangUtils {
                return sb.toString();
        }
 
-       public static void storeAsProperties(Dictionary<String, Object> props, Path path) throws IOException {
+       static void storeAsProperties(Dictionary<String, Object> props, Path path) throws IOException {
                if (props == null)
                        throw new IllegalArgumentException("Props cannot be null");
                Properties toStore = new Properties();
@@ -96,7 +99,7 @@ public class LangUtils {
                }
        }
 
-       public static void appendAsLdif(String dnBase, String dnKey, Dictionary<String, Object> props, Path path)
+       static void appendAsLdif(String dnBase, String dnKey, Dictionary<String, Object> props, Path path)
                        throws IOException {
                if (props == null)
                        throw new IllegalArgumentException("Props cannot be null");
@@ -126,7 +129,7 @@ public class LangUtils {
                }
        }
 
-       public static Dictionary<String, Object> loadFromProperties(Path path) throws IOException {
+       static Dictionary<String, Object> loadFromProperties(Path path) throws IOException {
                Properties toLoad = new Properties();
                try (InputStream in = Files.newInputStream(path)) {
                        toLoad.load(in);
@@ -137,6 +140,50 @@ public class LangUtils {
                return res;
        }
 
+       /*
+        * EXCEPTIONS
+        */
+       /**
+        * Chain the messages of all causes (one per line, <b>starts with a line
+        * return</b>) without all the stack
+        */
+       public static String chainCausesMessages(Throwable t) {
+               StringBuffer buf = new StringBuffer();
+               chainCauseMessage(buf, t);
+               return buf.toString();
+       }
+
+       /** Recursive chaining of messages */
+       private static void chainCauseMessage(StringBuffer buf, Throwable t) {
+               buf.append('\n').append(' ').append(t.getClass().getCanonicalName()).append(": ").append(t.getMessage());
+               if (t.getCause() != null)
+                       chainCauseMessage(buf, t.getCause());
+       }
+
+       /*
+        * TIME
+        */
+       /** Formats time elapsed since start. */
+       public static String since(ZonedDateTime start) {
+               ZonedDateTime now = ZonedDateTime.now();
+               return duration(start, now);
+       }
+
+       /** Formats a duration. */
+       public static String duration(Temporal start, Temporal end) {
+               long count = ChronoUnit.DAYS.between(start, end);
+               if (count != 0)
+                       return count > 1 ? count + " days" : count + " day";
+               count = ChronoUnit.HOURS.between(start, end);
+               if (count != 0)
+                       return count > 1 ? count + " hours" : count + " hours";
+               count = ChronoUnit.MINUTES.between(start, end);
+               if (count != 0)
+                       return count > 1 ? count + " minutes" : count + " minute";
+               count = ChronoUnit.SECONDS.between(start, end);
+               return count > 1 ? count + " seconds" : count + " second";
+       }
+
        /** Singleton constructor. */
        private LangUtils() {