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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 org.apache.commons.net.ftp.parser;
import org.apache.commons.net.ftp.Configurable;
import org.apache.commons.net.ftp.FTPClientConfig;
import java.text.ParseException;
import java.util.Calendar;
/**
* <p>
* 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.
* </p><p>
* This class also implements the {@link Configurable Configurable}
* interface to allow the parser to be configured from the outside.
* </p>
* @since 1.4
*/
/**
* To change the template for this generated type comment go to
* Window - Preferences - Java - Code Style - Code Templates - Comments
*/
public abstract class ConfigurableFTPFileEntryParserImpl
extends RegexFTPFileEntryParserImpl
implements Configurable
{
private FTPTimestampParser timestampParser;
/**
* Only constructor for this absract class.
* @param regex Regular expression used main parsing of the
* file listing.
*/
public ConfigurableFTPFileEntryParserImpl(String regex)
{
super(regex);
this.timestampParser = new FTPTimestampParserImpl();
}
/**
* This method is called by the concrete parsers to delegate
* timestamp parsing to the timestamp parser.
* <p>
* @param timestampStr the timestamp string pulled from the
* file listing by the regular expression parser, to be submitted
* to the <code>timestampParser</code> for extracting the timestamp.
* @return a <code>java.util.Calendar</code> containing results of the
* timestamp parse.
*/
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.
* </p>
* @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.
*/
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();
}
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