001/*
002 * jPOS Project [http://jpos.org]
003 * Copyright (C) 2000-2026 jPOS Software SRL
004 *
005 * This program is free software: you can redistribute it and/or modify
006 * it under the terms of the GNU Affero General Public License as
007 * published by the Free Software Foundation, either version 3 of the
008 * License, or (at your option) any later version.
009 *
010 * This program is distributed in the hope that it will be useful,
011 * but WITHOUT ANY WARRANTY; without even the implied warranty of
012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
013 * GNU Affero General Public License for more details.
014 *
015 * You should have received a copy of the GNU Affero General Public License
016 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
017 */
018
019package org.jpos.util;
020
021import java.util.regex.Matcher;
022import java.util.regex.Pattern;
023
024/**
025 * Return Caller's short class name, method and line number
026 */
027public class Caller {
028    private static String JAVA_ID_PATTERN = "(\\p{javaJavaIdentifierStart}\\p{javaJavaIdentifierPart}*)\\.*";
029    private static Pattern FQCN = Pattern.compile(JAVA_ID_PATTERN + "(\\." + JAVA_ID_PATTERN + ")*");
030    public static String info() {
031        return info(1);
032    }
033
034    public static String info(int pos) {
035        return info (Thread.currentThread().getStackTrace()[2+pos]);
036    }
037
038    public static String info (StackTraceElement st) {
039        String clazz = st.getClassName();
040        Matcher matcher = FQCN.matcher(clazz);
041        StringBuilder sb = new StringBuilder();
042        while (matcher.find()) {
043            sb.append(matcher.hitEnd() ? matcher.group(1) : matcher.group(1).charAt(0));
044            sb.append('.');
045        }
046        return sb.append(st.getMethodName())
047          .append(':')
048          .append(st.getLineNumber())
049          .toString();
050    }
051
052
053    public static String shortClassName(String clazz) {
054        Matcher matcher = FQCN.matcher(clazz);
055        StringBuilder sb = new StringBuilder();
056        while (matcher.find()) {
057            if (matcher.hitEnd()) {
058                sb.append(matcher.group(1));
059                break;
060            }
061            else {
062                sb.append(matcher.group(1).charAt(0));
063                sb.append('.');
064            }
065        }
066        return sb.toString();
067    }
068}