/*
* 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.nifi.attribute.expression.language.evaluation.functions;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.Locale;
import java.util.Map;
import java.util.TimeZone;
import org.apache.nifi.attribute.expression.language.evaluation.DateEvaluator;
import org.apache.nifi.attribute.expression.language.evaluation.Evaluator;
import org.apache.nifi.attribute.expression.language.evaluation.QueryResult;
import org.apache.nifi.attribute.expression.language.evaluation.StringEvaluator;
import org.apache.nifi.attribute.expression.language.evaluation.StringQueryResult;
public class FormatEvaluator extends StringEvaluator {
private final DateEvaluator subject;
private final Evaluator<String> format;
private final Evaluator<String> timeZone;
public FormatEvaluator(final DateEvaluator subject, final Evaluator<String> format, final Evaluator<String> timeZone) {
this.subject = subject;
this.format = format;
this.timeZone = timeZone;
}
@Override
public QueryResult<String> evaluate(final Map<String, String> attributes) {
final Date subjectValue = subject.evaluate(attributes).getValue();
if (subjectValue == null) {
return new StringQueryResult(null);
}
final QueryResult<String> formatResult = format.evaluate(attributes);
final String format = formatResult.getValue();
if (format == null) {
return null;
}
final SimpleDateFormat sdf = new SimpleDateFormat(format, Locale.US);
if(timeZone != null) {
final QueryResult<String> tzResult = timeZone.evaluate(attributes);
final String tz = tzResult.getValue();
if(tz != null && TimeZone.getTimeZone(tz) != null) {
sdf.setTimeZone(TimeZone.getTimeZone(tz));
}
}
return new StringQueryResult(sdf.format(subjectValue));
}
@Override
public Evaluator<?> getSubjectEvaluator() {
return subject;
}
}