/*
* 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.stream.Stream;
import org.apache.nifi.record.path.ArrayIndexFieldValue;
import org.apache.nifi.record.path.FieldValue;
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.ArrayDataType;
public class ArrayIndexPath extends RecordPathSegment {
private final int index;
ArrayIndexPath(final int index, final RecordPathSegment parent, final boolean absolute) {
super("[" + index + "]", parent, absolute);
this.index = index;
}
@Override
public Stream<FieldValue> evaluate(final RecordPathEvaluationContext context) {
final Stream<FieldValue> parentResult = getParentPath().evaluate(context);
return parentResult
.filter(Filters.fieldTypeFilter(RecordFieldType.ARRAY))
.filter(fieldValue -> fieldValue.getValue() != null && ((Object[]) fieldValue.getValue()).length >= Math.abs(index) - 1)
.map(fieldValue -> {
final ArrayDataType arrayDataType = (ArrayDataType) fieldValue.getField().getDataType();
final DataType elementDataType = arrayDataType.getElementType();
final RecordField arrayField = new RecordField(fieldValue.getField().getFieldName(), elementDataType);
final Object[] values = (Object[]) fieldValue.getValue();
final int arrayIndex = index < 0 ? values.length + index : index;
final RecordField elementField = new RecordField(arrayField.getFieldName() + "[" + arrayIndex + "]", elementDataType);
final FieldValue result = new ArrayIndexFieldValue(values[arrayIndex], elementField, fieldValue, arrayIndex);
return result;
});
}
}