nifi-commons/nifi-record-path/src/test/java/org/apache/nifi/record/path/util/TestFieldValueLogicalPathBuilder.java

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 * 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
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package org.apache.nifi.record.path.util;

import org.apache.nifi.record.path.FieldValue;
import org.apache.nifi.record.path.RecordPath;
import org.apache.nifi.serialization.record.Record;
import org.junit.jupiter.api.Test;

import java.util.List;
import java.util.stream.Collectors;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertThrows;

public class TestFieldValueLogicalPathBuilder extends AbstractWalkerTest {

    @Test
    public void buildLogicalPathDefault() {
        final Record record = buildDefaultRecord();
        final FieldValueLogicalPathBuilder builder = getDefaultLogicalPathBuilder();

        List<FieldValue> fieldValues =
            RecordPath.compile("//intArray[0..-1][. = 1]").evaluate(record).getSelectedFields().collect(
                Collectors.toList());
        assertEquals(1, fieldValues.size());

        final String mapRecordLevelPath = builder.buildLogicalPath(fieldValues.get(0));
        assertEquals("/mapRecord/intArray[0]", mapRecordLevelPath);

        fieldValues =
            RecordPath.compile("/mapRecordArray[0..-1]/intArray[0..-1][. > 1]").evaluate(record).getSelectedFields()
                .collect(Collectors.toList());
        assertEquals(4, fieldValues.size());
        String[] expected = {
            "/mapRecordArray[0]/intArray[0]",
            "/mapRecordArray[1]/intArray[0]",
            "/mapRecordArray[2]/intArray[0]",
            "/mapRecordArray[3]/intArray[0]",
        };
        for (int i = 0; i < fieldValues.size(); i++) {
            final String thePath = builder.buildLogicalPath(fieldValues.get(i));
            assertEquals(expected[i], thePath);
        }
    }

    @Test
    public void buildLogicalPathBuilderCustom() {
        final Record record = buildDefaultRecord();
        final FieldValueLogicalPathBuilder builder = getLogicalPathBuilder("--->", "{", "}");

        List<FieldValue> fieldValues =
            RecordPath.compile("//intArray[0..-1][. = 1]").evaluate(record).getSelectedFields().collect(
                Collectors.toList());
        assertEquals(1, fieldValues.size());

        final String mapRecordLevelPath = builder.buildLogicalPath(fieldValues.get(0));
        assertEquals("--->mapRecord--->intArray{0}", mapRecordLevelPath);

        fieldValues =
            RecordPath.compile("/mapRecordArray[0..-1]/intArray[0..-1][. > 1]").evaluate(record).getSelectedFields()
                .collect(Collectors.toList());
        assertEquals(4, fieldValues.size());
        String[] expected = {
            "--->mapRecordArray{0}--->intArray{0}",
            "--->mapRecordArray{1}--->intArray{0}",
            "--->mapRecordArray{2}--->intArray{0}",
            "--->mapRecordArray{3}--->intArray{0}",
        };
        for (int i = 0; i < fieldValues.size(); i++) {
            final String thePath = builder.buildLogicalPath(fieldValues.get(i));
            assertEquals(expected[i], thePath);
        }
    }

    @Test
    public void buildLogicalPathBuilderFailsNull() {
        final FieldValueLogicalPathBuilder builder = getDefaultLogicalPathBuilder();
        assertThrows(NullPointerException.class, () -> builder.buildLogicalPath(null));
    }
}