Caller's short class name, method and line number

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jpos/src/main/java/org/jpos/util/Caller.java

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+/*
+ * jPOS Project [http://jpos.org]
+ * Copyright (C) 2000-2017 jPOS Software SRL
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program 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 Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package org.jpos.util;
+
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+/**
+ * Return Caller's short class name, method and line number
+ */
+public class Caller {
+    private static String JAVA_ID_PATTERN = "(\\p{javaJavaIdentifierStart}\\p{javaJavaIdentifierPart}*)\\.*";
+    private static Pattern FQCN = Pattern.compile(JAVA_ID_PATTERN + "(\\." + JAVA_ID_PATTERN + ")*");
+    public static String info() {
+        return info(1);
+    }
+    public static String info(int pos) {
+        StackTraceElement st = Thread.currentThread().getStackTrace()[2+pos];
+        String clazz = st.getClassName();
+        Matcher matcher = FQCN.matcher(clazz);
+        StringBuilder sb = new StringBuilder();
+        while (matcher.find()) {
+            sb.append(matcher.hitEnd() ? matcher.group(1) : matcher.group(1).charAt(0));
+            sb.append('.');
+        }
+        return sb.append(st.getMethodName())
+          .append(':')
+          .append(Integer.toString(st.getLineNumber()))
+          .toString();
+    }
+}