/*
* 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.Map;
import java.util.stream.Stream;
import org.apache.nifi.record.path.FieldValue;
import org.apache.nifi.record.path.MapEntryFieldValue;
import org.apache.nifi.record.path.RecordPathEvaluationContext;
import org.apache.nifi.record.path.util.Filters;
import org.apache.nifi.serialization.record.DataType;
import org.apache.nifi.serialization.record.RecordField;
import org.apache.nifi.serialization.record.RecordFieldType;
import org.apache.nifi.serialization.record.type.MapDataType;
public class SingularMapKeyPath extends RecordPathSegment {
private final String mapKey;
SingularMapKeyPath(final String mapKey, final RecordPathSegment parent, final boolean absolute) {
super("[" + mapKey + "]", parent, absolute);
this.mapKey = mapKey;
}
@Override
public Stream<FieldValue> evaluate(final RecordPathEvaluationContext context) {
final Stream<FieldValue> parentResult = getParentPath().evaluate(context);
return parentResult
.filter(Filters.fieldTypeFilter(RecordFieldType.MAP))
.map(fieldValue -> {
final DataType valueType = ((MapDataType) fieldValue.getField().getDataType()).getValueType();
final RecordField elementField = new RecordField(fieldValue.getField().getFieldName() + "['" + mapKey + "']", valueType);
return new MapEntryFieldValue(getMapValue(fieldValue), elementField, fieldValue, mapKey);
});
}
private Object getMapValue(final FieldValue fieldValue) {
final Map<?, ?> map = (Map<?, ?>) fieldValue.getValue();
return map.get(mapKey);
}
}