001/** 002 * Logback: the reliable, generic, fast and flexible logging framework. 003 * Copyright (C) 1999-2015, QOS.ch. All rights reserved. 004 * 005 * This program and the accompanying materials are dual-licensed under 006 * either the terms of the Eclipse Public License v1.0 as published by 007 * the Eclipse Foundation 008 * 009 * or (per the licensee's choosing) 010 * 011 * under the terms of the GNU Lesser General Public License version 2.1 012 * as published by the Free Software Foundation. 013 */ 014package ch.qos.logback.core.pattern.color; 015 016import ch.qos.logback.core.pattern.CompositeConverter; 017import static ch.qos.logback.core.pattern.color.ANSIConstants.*; 018 019/** 020 * Base class for all foreground color setting composite converters. 021 * 022 * @param <E> 023 * @since 1.0.5 024 */ 025abstract public class ForegroundCompositeConverterBase<E> extends CompositeConverter<E> { 026 027 final private static String SET_DEFAULT_COLOR = ESC_START + "0;" + DEFAULT_FG + ESC_END; 028 029 @Override 030 protected String transform(E event, String in) { 031 StringBuilder sb = new StringBuilder(); 032 sb.append(ESC_START); 033 sb.append(getForegroundColorCode(event)); 034 sb.append(ESC_END); 035 sb.append(in); 036 sb.append(SET_DEFAULT_COLOR); 037 return sb.toString(); 038 } 039 040 /** 041 * Derived classes return the foreground color specific to the derived class 042 * instance. 043 * 044 * @return the foreground color for this instance 045 */ 046 abstract protected String getForegroundColorCode(E event); 047}