| /* |
| * 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 org.apache.karaf.shell.log.layout; |
| |
| import org.ops4j.pax.logging.spi.PaxLoggingEvent; |
| |
| /** |
| * Copied from log4j. |
| */ |
| /** |
| <p>PatternConverter is an abtract class that provides the |
| formatting functionality that derived classes need. |
| |
| <p>Conversion specifiers in a conversion patterns are parsed to |
| individual PatternConverters. Each of which is responsible for |
| converting a logging event in a converter specific manner. |
| */ |
| public abstract class PatternConverter { |
| public PatternConverter next; |
| int min = -1; |
| int max = 0x7FFFFFFF; |
| boolean leftAlign = false; |
| |
| protected |
| PatternConverter() { } |
| |
| protected |
| PatternConverter(FormattingInfo fi) { |
| min = fi.min; |
| max = fi.max; |
| leftAlign = fi.leftAlign; |
| } |
| |
| /** |
| Derived pattern converters must override this method in order to |
| convert conversion specifiers in the correct way. |
| */ |
| abstract |
| protected |
| String convert(PaxLoggingEvent event); |
| |
| /** |
| A template method for formatting in a converter specific way. |
| */ |
| public |
| void format(StringBuffer sbuf, PaxLoggingEvent e) { |
| String s = convert(e); |
| |
| if(s == null) { |
| if(0 < min) |
| spacePad(sbuf, min); |
| return; |
| } |
| |
| int len = s.length(); |
| |
| if(len > max) |
| sbuf.append(s.substring(len-max)); |
| else if(len < min) { |
| if(leftAlign) { |
| sbuf.append(s); |
| spacePad(sbuf, min-len); |
| } |
| else { |
| spacePad(sbuf, min-len); |
| sbuf.append(s); |
| } |
| } |
| else |
| sbuf.append(s); |
| } |
| |
| static String[] SPACES = {" ", " ", " ", " ", //1,2,4,8 spaces |
| " ", // 16 spaces |
| " " }; // 32 spaces |
| |
| /** |
| Fast space padding method. |
| */ |
| public |
| void spacePad(StringBuffer sbuf, int length) { |
| while(length >= 32) { |
| sbuf.append(SPACES[5]); |
| length -= 32; |
| } |
| |
| for(int i = 4; i >= 0; i--) { |
| if((length & (1<<i)) != 0) { |
| sbuf.append(SPACES[i]); |
| } |
| } |
| } |
| } |