net.sf.uadetector.json.datareader.JsonDataReader Maven / Gradle / Ivy
/*******************************************************************************
* Copyright 2012 André Rouél
*
* Licensed 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 net.sf.uadetector.json.datareader;
import java.net.URL;
import java.nio.charset.Charset;
import net.sf.qualitycheck.Check;
import net.sf.uadetector.datareader.DataReader;
import net.sf.uadetector.internal.data.Data;
import net.sf.uadetector.internal.util.UrlUtil;
import net.sf.uadetector.json.SerDeOption;
import net.sf.uadetector.json.internal.data.JsonConverter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Reader for UAS data in JSON representation.
*
*
* This reader is safe when used concurrently by multiple threads.
*
* @author André Rouél
*/
public final class JsonDataReader implements DataReader {
/**
* Corresponding default logger for this class
*/
private static final Logger LOG = LoggerFactory.getLogger(JsonDataReader.class);
/**
* Reads the UAS data in JSON format via the given URL.
*
* When during the reading errors occur which lead to a termination of the read operation, the information will be
* written to a log. The termination of the read operation will not lead to a program termination and in this case
* this method returns {@link Data#EMPTY}.
*
* @param url
* {@code URL} to User-Agent informations
* @param charset
* the character set in which the data should be read
* @return read in content as {@code Data} instance otherwise {@link Data#EMPTY}
*
* @throws net.sf.qualitycheck.exception.IllegalNullArgumentException
* if any of the given arguments is {@code null}
*/
@Override
public Data read(final URL url, final Charset charset) {
Check.notNull(url, "url");
Check.notNull(charset, "charset");
try {
final String json = UrlUtil.read(url, charset);
return read(json);
} catch (Exception e) {
LOG.warn(e.getLocalizedMessage(), e);
}
return Data.EMPTY;
}
/**
* Reads the UAS data in JSON format from the given string.
*
* When during the reading errors occur which lead to a termination of the read operation, the information will be
* written to a log. The termination of the read operation will not lead to a program termination and in this case
* this method returns {@link Data#EMPTY}.
*
* @param url
* {@code URL} to User-Agent informations
* @param charset
* the character set in which the data should be read
* @return read in content as {@code Data} instance otherwise {@link Data#EMPTY}
*
* @throws net.sf.qualitycheck.exception.IllegalNullArgumentException
* if any of the given arguments is {@code null}
*/
@Override
public Data read(final String json) {
Check.notNull(json, "json");
try {
return JsonConverter.deserialize(json, SerDeOption.HASH_VALIDATING).getData();
} catch (Exception e) {
LOG.warn(e.getLocalizedMessage(), e);
}
return Data.EMPTY;
}
}