/*
* 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.record.path.paths;
import java.util.Optional;
import java.util.stream.Stream;
import org.apache.nifi.record.path.FieldValue;
import org.apache.nifi.record.path.RecordPathEvaluationContext;
import org.apache.nifi.record.path.StandardFieldValue;
import org.apache.nifi.record.path.util.Filters;
import org.apache.nifi.serialization.record.Record;
import org.apache.nifi.serialization.record.RecordField;
import org.apache.nifi.serialization.record.RecordFieldType;
public class ChildFieldPath extends RecordPathSegment {
private final String childName;
ChildFieldPath(final String childName, final RecordPathSegment parent, final boolean absolute) {
super("/" + childName, parent, absolute);
this.childName = childName;
}
private FieldValue missingChild(final FieldValue parent) {
final RecordField field = new RecordField(childName, RecordFieldType.CHOICE.getChoiceDataType(RecordFieldType.STRING.getDataType(), RecordFieldType.RECORD.getDataType()));
return new StandardFieldValue(null, field, parent);
}
private FieldValue getChild(final FieldValue fieldValue) {
if (!Filters.isRecord(fieldValue)) {
return missingChild(fieldValue);
}
final Record record = (Record) fieldValue.getValue();
final Object value = record.getValue(childName);
if (value == null) {
return missingChild(fieldValue);
}
final Optional<RecordField> field = record.getSchema().getField(childName);
if (!field.isPresent()) {
return missingChild(fieldValue);
}
return new StandardFieldValue(value, field.get(), fieldValue);
}
@Override
public Stream<FieldValue> evaluate(final RecordPathEvaluationContext context) {
return getParentPath().evaluate(context)
// map to Optional<FieldValue> containing child element
.map(fieldVal -> getChild(fieldVal));
}
}