How to use getFieldValueFunction method of com.tngtech.jgiven.impl.util.ReflectionUtil class

Best JGiven code snippet using com.tngtech.jgiven.impl.util.ReflectionUtil.getFieldValueFunction

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...161 */​162 public static List<Object> getAllNonStaticFieldValuesFrom( final Class<?> clazz, final Object target, final String errorDescription ){163 return getAllFieldValues( target, getAllNonStaticFields( clazz ), errorDescription );164 }165 private static Function<Field, Object> getFieldValueFunction( final Object target, final String errorDescription ){166 return field -> getFieldValueOrNull( field, target, errorDescription );167 }168 public static Object getFieldValueOrNull( String fieldName, Object target, String errorDescription ){169 try {170 Field field = target.getClass().getDeclaredField( fieldName );171 return getFieldValueOrNull( field, target, errorDescription );172 } catch( Exception e ) {173 log.warn(174 format( "Not able to access field '%s'." + errorDescription, fieldName ), e );175 return null;176 }177 }178 public static Object getFieldValueOrNull( Field field, Object target, String errorDescription ){179 makeAccessible( field, "" );180 try {181 return field.get( target );182 } catch( IllegalAccessException e ) {183 log.warn(184 format( "Not able to access field '%s'." + errorDescription, toReadableString( field ) ), e );185 return null;186 }187 }188 public static List<Field> getAllNonStaticFields( Class<?> clazz ){189 final List<Field> result = Lists.newArrayList();190 forEachField( null, clazz, nonStaticField(), new FieldAction() {191 @Override192 public void act( Object target, Field field ) throws Exception{193 result.add( field );194 }195 } );196 return result;197 }198 public static List<Object> getAllFieldValues( Object target, Iterable<Field> fields, String errorDescription ){199 return StreamSupport.stream( fields.spliterator(), false )200 .map( getFieldValueFunction( target, errorDescription ) )201 .collect( Collectors.toList() );202 }203 public static List<String> getAllFieldNames( Iterable<Field> fields ){204 return StreamSupport.stream( fields.spliterator(), false )205 .map( Field::getName )206 .collect( Collectors.toList() );207 }208 public static void setField( Field field, Object object, Object value, String errorDescription ){209 makeAccessible( field, errorDescription );210 try {211 field.set( object, value );212 } catch( IllegalArgumentException e ) {213 log.debug( "Caught exception:", e );214 throw new JGivenInjectionException( "Could not set " + toReadableString( field ) + errorDescription +...

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getFieldValueFunction

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1import com.tngtech.jgiven.impl.util.ReflectionUtil;2import org.junit.Test;3import static org.assertj.core.api.Assertions.assertThat;4public class ReflectionUtilTest {5 public void testGetFieldValueFunction() throws NoSuchFieldException {6 ReflectionUtil reflectionUtil = new ReflectionUtil();7 TestClass testClass = new TestClass();8 testClass.setTestString("testString");9 assertThat(reflectionUtil.getFieldValueFunction(TestClass.class, "testString").apply(testClass)).isEqualTo("testString");10 }11 private static class TestClass {12 private String testString;13 public String getTestString() {14 return testString;15 }16 public void setTestString(String testString) {17 this.testString = testString;18 }19 }20}21public class CustomReportFormatter extends AbstractReportFormatter {22 public void formatReport(ReportModel model, File outputDirectory) throws IOException {23 }24}25JGivenReportConfig config = JGivenReportConfig.newInstance()26 .withReportFormatters(new CustomReportFormatter());27JGivenHtml5ReportGenerator.generateReport(config);28public class CustomReportModel extends ReportModel {29}

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getFieldValueFunction

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1import com.tngtech.jgiven.impl.util.ReflectionUtil;2import org.junit.Test;3import java.util.function.Function;4import static org.assertj.core.api.Assertions.assertThat;5public class ReflectionUtilTest {6 public void test_getFieldValueFunction() {7 final String fieldName = "value";8 final String fieldValue = "Hello, World!";9 final Function<Object, Object> function = ReflectionUtil.getFieldValueFunction(MyClass.class, fieldName);10 final Object value = function.apply(new MyClass(fieldValue));11 assertThat(value).isEqualTo(fieldValue);12 }13 public void test_getFieldValueFunction_static() {14 final String fieldName = "value";15 final String fieldValue = "Hello, World!";16 final MyClass myClass = new MyClass(fieldValue);17 final Function<Object, Object> function = ReflectionUtil.getFieldValueFunction(MyClass.class, fieldName, true);18 final Object value = function.apply(myClass);19 assertThat(value).isEqualTo(fieldValue);20 }21 public void test_getFieldValueFunction_final() {22 final String fieldName = "value";23 final String fieldValue = "Hello, World!";24 final Function<Object, Object> function = ReflectionUtil.getFieldValueFunction(MyClass.class, fieldName, false, true);25 final Object value = function.apply(new MyClass(fieldValue));26 assertThat(value).isEqualTo(fieldValue);27 }28 private static class MyClass {29 private final String value;30 public MyClass(String value) {31 this.value = value;32 }33 }34}

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