com.feilong.lib.net.ftp.parser.ConfigurableFTPFileEntryParserImpl Maven / Gradle / Ivy
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/*
* 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 com.feilong.lib.net.ftp.parser;
import java.text.ParseException;
import java.util.Calendar;
import com.feilong.lib.net.ftp.Configurable;
import com.feilong.lib.net.ftp.FTPClientConfig;
/**
*
* This abstract class implements the common timestamp parsing
* algorithm for all the concrete parsers. Classes derived from
* this one will parse file listings via a supplied regular expression
* that pulls out the date portion as a separate string which is
* passed to the underlying {@link FTPTimestampParser delegate} to
* handle parsing of the file timestamp.
*
* This class also implements the {@link Configurable Configurable}
* interface to allow the parser to be configured from the outside.
*
* @since 1.4
*/
public abstract class ConfigurableFTPFileEntryParserImpl extends RegexFTPFileEntryParserImpl implements Configurable{
private final FTPTimestampParser timestampParser;
/**
* constructor for this abstract class.
*
* @param regex
* Regular expression used main parsing of the
* file listing.
*/
public ConfigurableFTPFileEntryParserImpl(String regex){
super(regex);
this.timestampParser = new FTPTimestampParserImpl();
}
/**
* constructor for this abstract class.
*
* @param regex
* Regular expression used main parsing of the
* file listing.
* @param flags
* the flags to apply, see
* {@link java.util.regex.Pattern#compile(String, int) Pattern#compile(String, int)}. Use 0 for none.
* @since 3.4
*/
public ConfigurableFTPFileEntryParserImpl(String regex, int flags){
super(regex, flags);
this.timestampParser = new FTPTimestampParserImpl();
}
/**
* This method is called by the concrete parsers to delegate
* timestamp parsing to the timestamp parser.
*
* @param timestampStr
* the timestamp string pulled from the
* file listing by the regular expression parser, to be submitted
* to the timestampParser
for extracting the timestamp.
* @return a java.util.Calendar
containing results of the
* timestamp parse.
* @throws ParseException
* on parse error
*/
public Calendar parseTimestamp(String timestampStr) throws ParseException{
return this.timestampParser.parseTimestamp(timestampStr);
}
/**
* Implementation of the {@link Configurable Configurable}
* interface. Configures this parser by delegating to the
* underlying Configurable FTPTimestampParser implementation, '
* passing it the supplied {@link FTPClientConfig FTPClientConfig}
* if that is non-null or a default configuration defined by
* each concrete subclass.
*
* @param config
* the configuration to be used to configure this parser.
* If it is null, a default configuration defined by
* each concrete subclass is used instead.
*/
@Override
public void configure(FTPClientConfig config){
if (this.timestampParser instanceof Configurable){
FTPClientConfig defaultCfg = getDefaultConfiguration();
if (config != null){
if (null == config.getDefaultDateFormatStr()){
config.setDefaultDateFormatStr(defaultCfg.getDefaultDateFormatStr());
}
if (null == config.getRecentDateFormatStr()){
config.setRecentDateFormatStr(defaultCfg.getRecentDateFormatStr());
}
((Configurable) this.timestampParser).configure(config);
}else{
((Configurable) this.timestampParser).configure(defaultCfg);
}
}
}
/**
* Each concrete subclass must define this member to create
* a default configuration to be used when that subclass is
* instantiated without a {@link FTPClientConfig FTPClientConfig}
* parameter being specified.
*
* @return the default configuration for the subclass.
*/
protected abstract FTPClientConfig getDefaultConfiguration();
}