| /** |
| * 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.hadoop.gateway.launcher; |
| |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.PrintWriter; |
| import java.io.Reader; |
| import java.io.Writer; |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| public class Config { |
| |
| static String DEFAULT_NAME = ""; |
| static String COMMENT_PREFIX = "#"; |
| static String SECTION_PREFIX = "["; |
| static String SECTION_SUFFIX = "]"; |
| static Pattern SECTION_PATTERN = Pattern.compile( "^\\[(.*?)\\]?$" ); |
| static Pattern PAIR_PATTERN = Pattern.compile( "^(.*?)=(.*)$" ); |
| |
| Map<String,Map<String,String>> sections; |
| |
| public Config() { |
| sections = new LinkedHashMap<String,Map<String,String>>(); |
| } |
| |
| public void load( Reader reader ) throws IOException { |
| if( reader != null ) { |
| BufferedReader input = new BufferedReader( reader ); |
| String profile = null; |
| String line = input.readLine(); |
| while( line != null ) { |
| line = line.trim(); |
| if( line.length() == 0 ) { |
| // Ignore blank lines. |
| } else if( line.startsWith( COMMENT_PREFIX ) ) { |
| // Ignore comments. |
| } else if( line.startsWith( SECTION_PREFIX ) ) { |
| // Switch sections. |
| Matcher matcher = SECTION_PATTERN.matcher( line ); |
| if( matcher.matches() ) { |
| profile = matcher.group( 1 ); |
| } |
| } else { |
| // Consume line. |
| Matcher matcher = PAIR_PATTERN.matcher( line ); |
| if( matcher.matches() ) { |
| if( matcher.groupCount() > 0 ) { |
| String name = matcher.group( 1 ); |
| String value = null; |
| if( matcher.groupCount() > 1 ) { |
| value = matcher.group( 2 ); |
| } |
| set( profile, name, value ); |
| } |
| } |
| } |
| line = input.readLine(); |
| } |
| } |
| } |
| |
| public void save( Writer writer ) { |
| boolean empty = true; |
| if( writer != null ) { |
| PrintWriter output = new PrintWriter( writer ); |
| Map<String,String> map = sections.get( DEFAULT_NAME ); |
| if( map != null ) { |
| empty &= ( map.size() == 0 ); |
| saveMap( output, map ); |
| } |
| for( Map.Entry<String,Map<String,String>> entry : sections.entrySet() ) { |
| if( !empty ) { |
| output.println(); |
| } |
| String section = entry.getKey(); |
| if( section != null && !section.equals( DEFAULT_NAME ) ) { |
| map = sections.get( section ); |
| output.print( SECTION_PREFIX ); |
| output.print( section ); |
| output.println( SECTION_SUFFIX ); |
| empty = false; |
| saveMap( output, map ); |
| } |
| } |
| } |
| } |
| |
| void saveMap( PrintWriter output, Map<String,String> map ) { |
| for( Map.Entry<String,String> entry : map.entrySet() ) { |
| output.print( entry.getKey() ); |
| output.print( "=" ); |
| String value = entry.getValue(); |
| if( value != null ) { |
| output.print( entry.getValue() ); |
| } |
| } |
| } |
| |
| public String get( String section, String name ) { |
| section = fixName( section ); |
| name = fixName( name ); |
| String value = null; |
| Map<String,String> map = sections.get( section ); |
| if( map != null && map.containsKey( name ) ) { |
| value = map.get( name ); |
| } else { |
| map = sections.get( DEFAULT_NAME ); |
| if( map != null ) { |
| value = map.get( name ); |
| } |
| } |
| return value; |
| } |
| |
| public void set( String section, String name, String value ) { |
| section = fixName( section ); |
| name = fixName( name ); |
| Map<String,String> map = sections.get( section ); |
| if( map == null ) { |
| map = new LinkedHashMap<String, String>(); |
| sections.put( section, map ); |
| } |
| map.put( name, value ); |
| } |
| |
| private static String fixName( String name ) { |
| return( name == null ? DEFAULT_NAME : name.trim() ); |
| } |
| |
| } |