UniVocityFixedWidthDataFormatMarshalTest.java

/**
 * 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.camel.dataformat.univocity;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

import org.apache.camel.EndpointInject;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.component.mock.MockEndpoint;
import org.apache.camel.spi.DataFormat;
import org.apache.camel.test.junit4.CamelTestSupport;
import org.junit.Test;

import static org.apache.camel.dataformat.univocity.UniVocityTestHelper.asMap;
import static org.apache.camel.dataformat.univocity.UniVocityTestHelper.join;

/**
 * This class tests the marshalling of {@link org.apache.camel.dataformat.univocity.UniVocityFixedWidthDataFormat}.
 */
public final class UniVocityFixedWidthDataFormatMarshalTest extends CamelTestSupport {
    @EndpointInject(uri = "mock:result")
    MockEndpoint result;

    /**
     * Tests that we can marshal fixed-width with the default configuration.
     */
    @Test
    public void shouldMarshalWithDefaultConfiguration() throws Exception {
        template.sendBody("direct:default", Arrays.asList(
                asMap("A", "1", "B", "2", "C", "3"),
                asMap("A", "one", "B", "two", "C", "three")
        ));

        result.expectedMessageCount(1);
        result.assertIsSatisfied();

        String body = assertIsInstanceOf(String.class, result.getExchanges().get(0).getIn().getBody());
        assertEquals(join("1  2  3    ", "onetwothree"), body);
    }

    /**
     * Tests that we can marshal a single line with fixed-width.
     */
    @Test
    public void shouldMarshalSingleLine() throws Exception {
        template.sendBody("direct:default", asMap("A", "1", "B", "2", "C", "3"));

        result.expectedMessageCount(1);
        result.assertIsSatisfied();

        String body = assertIsInstanceOf(String.class, result.getExchanges().get(0).getIn().getBody());
        assertEquals(join("1  2  3    "), body);
    }

    /**
     * Tests that the marshalling adds new columns on the fly and keep its order
     */
    @Test
    public void shouldMarshalAndAddNewColumns() throws Exception {
        template.sendBody("direct:default", Arrays.asList(
                asMap("A", "1", "B", "2"),
                asMap("C", "three", "A", "one", "B", "two")
        ));

        result.expectedMessageCount(1);
        result.assertIsSatisfied();

        String body = assertIsInstanceOf(String.class, result.getExchanges().get(0).getIn().getBody());
        assertEquals(join("1  2  ", "onetwothree"), body);
    }

    /**
     * Tests that we can marshal fixed-width with specific headers
     */
    @Test
    public void shouldMarshalWithSpecificHeaders() throws Exception {
        template.sendBody("direct:header", Arrays.asList(
                asMap("A", "1", "B", "2", "C", "3"),
                asMap("A", "one", "B", "two", "C", "three")
        ));

        result.expectedMessageCount(1);
        result.assertIsSatisfied();

        String body = assertIsInstanceOf(String.class, result.getExchanges().get(0).getIn().getBody());
        assertEquals(join("1  3    ", "onethree"), body);
    }

    /**
     * Tests that we can marshal fixed-width using and advanced configuration
     */
    @Test
    public void shouldMarshalUsingAdvancedConfiguration() throws Exception {
        template.sendBody("direct:advanced", Arrays.asList(
                asMap("A", null, "B", ""),
                asMap("A", "one", "B", "two")
        ));

        result.expectedMessageCount(1);
        result.assertIsSatisfied();

        String body = assertIsInstanceOf(String.class, result.getExchanges().get(0).getIn().getBody());
        assertEquals(join("N/A__empty", "one__two__"), body);
    }

    @Override
    protected RouteBuilder createRouteBuilder() throws Exception {
        final Map<String, DataFormat> tests = new HashMap<String, DataFormat>();

        // Default writing of fixed-width
        tests.put("default", new UniVocityFixedWidthDataFormat()
                        .setFieldLengths(new int[]{3, 3, 5})
        );

        // Write a fixed-width with specific headers
        tests.put("header", new UniVocityFixedWidthDataFormat()
                        .setFieldLengths(new int[]{3, 5})
                        .setHeaders(new String[]{"A", "C"})
        );

        // Write a fixed-width with an advanced configuration
        tests.put("advanced", new UniVocityFixedWidthDataFormat()
                        .setFieldLengths(new int[]{5, 5})
                        .setNullValue("N/A")
                        .setEmptyValue("empty")
                        .setPadding('_')
        );

        return new RouteBuilder() {
            @Override
            public void configure() throws Exception {
                for (Map.Entry<String, DataFormat> test : tests.entrySet()) {
                    from("direct:" + test.getKey()).marshal(test.getValue()).convertBodyTo(String.class).to("mock:result");
                }
            }
        };
    }
}