Allow multiple date formats for date fields.

Original Pull Request #1728 
Closes #1727

Author: xhaggi

src/main/asciidoc/reference/elasticsearch-object-mapping.adoc

@@ -56,16 +56,18 @@ Default value is _EXTERNAL_.
 Constructor arguments are mapped by name to the key values in the retrieved Document.
 * `@Field`: Applied at the field level and defines properties of the field, most of the attributes map to the respective https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping.html[Elasticsearch Mapping] definitions (the following list is not complete, check the annotation Javadoc for a complete reference):
 ** `name`: The name of the field as it will be represented in the Elasticsearch document, if not set, the Java field name is used.
-** `type`: the field type, can be one of _Text, Keyword, Long, Integer, Short, Byte, Double, Float, Half_Float, Scaled_Float, Date, Date_Nanos, Boolean, Binary, Integer_Range, Float_Range, Long_Range, Double_Range, Date_Range, Ip_Range, Object, Nested, Ip, TokenCount, Percolator, Flattened, Search_As_You_Type_.
+** `type`: The field type, can be one of _Text, Keyword, Long, Integer, Short, Byte, Double, Float, Half_Float, Scaled_Float, Date, Date_Nanos, Boolean, Binary, Integer_Range, Float_Range, Long_Range, Double_Range, Date_Range, Ip_Range, Object, Nested, Ip, TokenCount, Percolator, Flattened, Search_As_You_Type_.
 See https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-types.html[Elasticsearch Mapping Types]
-** `format` and `pattern` definitions for the _Date_ type.
+** `format`: One or more built-in formats, default value is _strict_date_optional_time_ and _epoch_millis_.
+See https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-date-format.html#built-in-date-formats[Elasticsearch Built In Formats]
+** `pattern`: One or more custom date formats. NOTE: If you want to use only custom date formats, you must set the `format` property to empty `{}`.
+See https://www.elastic.co/guide/en/elasticsearch/reference/current/mapping-date-format.html#custom-date-formats[Elasticsearch Custom Date Formats]
 ** `store`: Flag whether the original field value should be store in Elasticsearch, default value is _false_.
 ** `analyzer`, `searchAnalyzer`, `normalizer` for specifying custom analyzers and normalizer.
-* `@GeoPoint`: marks a field as _geo_point_ datatype.
+* `@GeoPoint`: Marks a field as _geo_point_ datatype.
 Can be omitted if the field is an instance of the `GeoPoint` class.
 
-NOTE: Properties that derive from `TemporalAccessor` or are of type `java.util.Date` must either have a `@Field` annotation of type `FieldType.Date` and a
-format different from `DateFormat.none` or a custom converter must be registered for this type. +
+NOTE: Properties that derive from `TemporalAccessor` or are of type `java.util.Date` must either have a `@Field` annotation of type `FieldType.Date`.
 If you are using a custom date format, you need to use _uuuu_ for the year instead of _yyyy_.
 This is due to a https://www.elastic.co/guide/en/elasticsearch/reference/current/migrate-to-java-time.html#java-time-migration-incompatible-date-formats[change in Elasticsearch 7].
 

src/main/java/org/springframework/data/elasticsearch/annotations/DateFormat.java

@@ -23,9 +23,21 @@
  * @author Jakub Vavrik
  * @author Tim te Beek
  * @author Peter-Josef Meisch
+ * @author Sascha Woo
  */
 public enum DateFormat {
+	/**
+	 * @deprecated since 4.2, will be removed in a future version. Use <code>format = {}</code> to disable built-in date
+	 *             formats in the @Field annotation.
+	 */
+	@Deprecated
 	none(""), //
+	/**
+	 * @deprecated since 4.2, will be removed in a future version.It is no longer required for using a custom date format
+	 *             pattern. If you want to use only a custom date format pattern, you must set the <code>format</code>
+	 *             property to empty <code>{}</code>.
+	 */
+	@Deprecated
 	custom(""), //
 	basic_date("uuuuMMdd"), //
 	basic_date_time("uuuuMMdd'T'HHmmss.SSSXXX"), //

src/main/java/org/springframework/data/elasticsearch/annotations/Field.java

@@ -36,6 +36,7 @@
  * @author Aleksei Arsenev
  * @author Brian Kimmig
  * @author Morgan Lutz
+ * @author Sascha Woo
  */
 @Retention(RetentionPolicy.RUNTIME)
 @Target({ ElementType.FIELD, ElementType.ANNOTATION_TYPE })
@@ -65,9 +66,9 @@
 
 	boolean index() default true;
 
-	DateFormat format() default DateFormat.none;
+	DateFormat[] format() default { DateFormat.date_optional_time, DateFormat.epoch_millis };
 
-	String pattern() default "";
+	String[] pattern() default {};
 
 	boolean store() default false;
 

src/main/java/org/springframework/data/elasticsearch/annotations/InnerField.java

@@ -40,9 +40,9 @@
 
 	boolean index() default true;
 
-	DateFormat format() default DateFormat.none;
+	DateFormat[] format() default { DateFormat.date_optional_time, DateFormat.epoch_millis };
 
-	String pattern() default "";
+	String[] pattern() default {};
 
 	boolean store() default false;
 

src/main/java/org/springframework/data/elasticsearch/core/index/MappingParameters.java

@@ -17,6 +17,9 @@
 
 import java.io.IOException;
 import java.lang.annotation.Annotation;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
 
 import org.elasticsearch.common.Nullable;
 import org.elasticsearch.common.xcontent.XContentBuilder;
@@ -41,6 +44,7 @@
  * @author Aleksei Arsenev
  * @author Brian Kimmig
  * @author Morgan Lutz
+ * @author Sascha Woo
  * @since 4.0
  */
 public final class MappingParameters {
@@ -78,12 +82,12 @@ public final class MappingParameters {
 	private final String analyzer;
 	private final boolean coerce;
 	@Nullable private final String[] copyTo;
-	private final String datePattern;
+	private final DateFormat[] dateFormats;
+	private final String[] dateFormatPatterns;
 	private final boolean docValues;
 	private final boolean eagerGlobalOrdinals;
 	private final boolean enabled;
 	private final boolean fielddata;
-	private final DateFormat format;
 	@Nullable private final Integer ignoreAbove;
 	private final boolean ignoreMalformed;
 	private final boolean index;
@@ -129,8 +133,8 @@ private MappingParameters(Field field) {
 		store = field.store();
 		fielddata = field.fielddata();
 		type = field.type();
-		format = field.format();
-		datePattern = field.pattern();
+		dateFormats = field.format();
+		dateFormatPatterns = field.pattern();
 		analyzer = field.analyzer();
 		searchAnalyzer = field.searchAnalyzer();
 		normalizer = field.normalizer();
@@ -171,8 +175,8 @@ private MappingParameters(InnerField field) {
 		store = field.store();
 		fielddata = field.fielddata();
 		type = field.type();
-		format = field.format();
-		datePattern = field.pattern();
+		dateFormats = field.format();
+		dateFormatPatterns = field.pattern();
 		analyzer = field.analyzer();
 		searchAnalyzer = field.searchAnalyzer();
 		normalizer = field.normalizer();
@@ -226,8 +230,24 @@ public void writeTypeAndParametersTo(XContentBuilder builder) throws IOException
 
 		if (type != FieldType.Auto) {
 			builder.field(FIELD_PARAM_TYPE, type.name().toLowerCase());
-			if (type == FieldType.Date && format != DateFormat.none) {
-				builder.field(FIELD_PARAM_FORMAT, format == DateFormat.custom ? datePattern : format.toString());
+
+			if (type == FieldType.Date) {
+				List<String> formats = new ArrayList<>();
+
+				// built-in formats
+				for (DateFormat dateFormat : dateFormats) {
+					if (dateFormat == DateFormat.none || dateFormat == DateFormat.custom) {
+						continue;
+					}
+					formats.add(dateFormat.toString());
+				}
+
+				// custom date formats
+				Collections.addAll(formats, dateFormatPatterns);
+
+				if (!formats.isEmpty()) {
+					builder.field(FIELD_PARAM_FORMAT, String.join("||", formats));
+				}
 			}
 		}
 

src/main/java/org/springframework/data/elasticsearch/core/mapping/SimpleElasticsearchPersistentProperty.java

@@ -16,6 +16,7 @@
 package org.springframework.data.elasticsearch.core.mapping;
 
 import java.time.temporal.TemporalAccessor;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Date;
 import java.util.List;
@@ -154,51 +155,74 @@ private void initDateConverter() {
 
 		if (field != null && (field.type() == FieldType.Date || field.type() == FieldType.Date_Nanos)
 				&& (isTemporalAccessor || isDate)) {
-			DateFormat dateFormat = field.format();
+
+			DateFormat[] dateFormats = field.format();
+			String[] dateFormatPatterns = field.pattern();
 
 			String property = getOwner().getType().getSimpleName() + "." + getName();
 
-			if (dateFormat == DateFormat.none) {
+			if (dateFormats.length == 0 && dateFormatPatterns.length == 0) {
 				LOGGER.warn(
-						String.format("No DateFormat defined for property %s. Make sure you have a Converter registered for %s",
-								property, actualType.getSimpleName()));
+						"Property '{}' has @Field type '{}' but has no built-in format or custom date pattern defined. Make sure you have a converter registered for type {}.",
+						property, field.type().name(), actualType.getSimpleName());
 				return;
 			}
 
-			ElasticsearchDateConverter converter = null;
-
-			if (dateFormat == DateFormat.custom) {
-				String pattern = field.pattern();
-
-				if (!StringUtils.hasLength(pattern)) {
-					throw new MappingException(
-							String.format("Property %s is annotated with FieldType.%s and a custom format but has no pattern defined",
-									property, field.type().name()));
-				}
-
-				converter = ElasticsearchDateConverter.of(pattern);
-			} else {
+			List<ElasticsearchDateConverter> converters = new ArrayList<>();
 
+			// register converters for built-in formats
+			for (DateFormat dateFormat : dateFormats) {
 				switch (dateFormat) {
+					case none:
+					case custom:
+						break;
 					case weekyear:
 					case weekyear_week:
 					case weekyear_week_day:
-						LOGGER.warn("no Converter available for " + actualType.getName() + " and date format " + dateFormat.name()
-								+ ". Use a custom converter instead");
+						LOGGER.warn("No default converter available for '{}' and date format '{}'. Use a custom converter instead.",
+								actualType.getName(), dateFormat.name());
 						break;
 					default:
-						converter = ElasticsearchDateConverter.of(dateFormat);
+						converters.add(ElasticsearchDateConverter.of(dateFormat));
 						break;
 				}
 			}
 
-			if (converter != null) {
-				ElasticsearchDateConverter finalConverter = converter;
+			// register converters for custom formats
+			for (String dateFormatPattern : dateFormatPatterns) {
+				if (!StringUtils.hasText(dateFormatPattern)) {
+					throw new MappingException(
+							String.format("Date pattern of property '%s' must not be empty", property));
+				}
+				converters.add(ElasticsearchDateConverter.of(dateFormatPattern));
+			}
+
+			if (!converters.isEmpty()) {
 				propertyConverter = new ElasticsearchPersistentPropertyConverter() {
-					final ElasticsearchDateConverter dateConverter = finalConverter;
+					final List<ElasticsearchDateConverter> dateConverters = converters;
+
+					@SuppressWarnings("unchecked")
+					@Override
+					public Object read(String s) {
+						for (ElasticsearchDateConverter dateConverter : dateConverters) {
+							try {
+								if (isTemporalAccessor) {
+									return dateConverter.parse(s, (Class<? extends TemporalAccessor>) actualType);
+								} else { // must be date
+									return dateConverter.parse(s);
+								}
+							} catch (Exception e) {
+								LOGGER.trace(e.getMessage(), e);
+							}
+						}
+
+						throw new RuntimeException(String
+								.format("Unable to parse date value '%s' of property '%s' with configured converters", s, property));
+					}
 
 					@Override
 					public String write(Object property) {
+						ElasticsearchDateConverter dateConverter = dateConverters.get(0);
 						if (isTemporalAccessor && TemporalAccessor.class.isAssignableFrom(property.getClass())) {
 							return dateConverter.format((TemporalAccessor) property);
 						} else if (isDate && Date.class.isAssignableFrom(property.getClass())) {
@@ -207,16 +231,6 @@ public String write(Object property) {
 							return property.toString();
 						}
 					}
-
-					@SuppressWarnings("unchecked")
-					@Override
-					public Object read(String s) {
-						if (isTemporalAccessor) {
-							return dateConverter.parse(s, (Class<? extends TemporalAccessor>) actualType);
-						} else { // must be date
-							return dateConverter.parse(s);
-						}
-					}
 				};
 			}
 		}

src/test/java/org/springframework/data/elasticsearch/core/CriteriaQueryMappingUnitTests.java

@@ -48,6 +48,7 @@
  * {@link CriteriaQueryProcessor} as this is needed to get the String representation to assert.
  *
  * @author Peter-Josef Meisch
+ * @author Sascha Woo
  */
 public class CriteriaQueryMappingUnitTests {
 
@@ -346,8 +347,7 @@ static class Person {
 		@Nullable @Field(name = "first-name") String firstName;
 		@Nullable @Field(name = "last-name") String lastName;
 		@Nullable @Field(name = "created-date", type = FieldType.Date, format = DateFormat.epoch_millis) Date createdDate;
-		@Nullable @Field(name = "birth-date", type = FieldType.Date, format = DateFormat.custom,
-				pattern = "dd.MM.uuuu") LocalDate birthDate;
+		@Nullable @Field(name = "birth-date", type = FieldType.Date, format = {}, pattern = "dd.MM.uuuu") LocalDate birthDate;
 	}
 
 	static class GeoShapeEntity {

src/test/java/org/springframework/data/elasticsearch/core/convert/ElasticsearchDateConverterUnitTests.java

@@ -23,6 +23,7 @@
 /**
  * @author Peter-Josef Meisch
  * @author Tim te Beek
+ * @author Sascha Woo
  */
 class ElasticsearchDateConverterUnitTests {
 
@@ -34,16 +35,28 @@ void shouldCreateConvertersForAllKnownFormats(DateFormat dateFormat) {
 
 		switch (dateFormat) {
 			case none:
+			case custom:
 			case weekyear:
 			case weekyear_week:
 			case weekyear_week_day:
 				return;
 		}
 
-		String pattern = (dateFormat != DateFormat.custom) ? dateFormat.name() : "dd.MM.uuuu";
+		ElasticsearchDateConverter converter = ElasticsearchDateConverter.of(dateFormat.name());
 
+		assertThat(converter).isNotNull();
+	}
+
+	@Test // DATAES-716
+	void shouldCreateConvertersForDateFormatPattern() {
+
+		// given
+		String pattern = "dd.MM.uuuu";
+
+		// when
 		ElasticsearchDateConverter converter = ElasticsearchDateConverter.of(pattern);
 
+		// then
 		assertThat(converter).isNotNull();
 	}
 

src/test/java/org/springframework/data/elasticsearch/core/convert/MappingElasticsearchConverterUnitTests.java

@@ -83,6 +83,7 @@
  * @author Peter-Josef Meisch
  * @author Konrad Kurdej
  * @author Roman Puchkovskiy
+ * @author Sascha Woo
  */
 public class MappingElasticsearchConverterUnitTests {
 
@@ -1218,8 +1219,7 @@ static class Person {
 		String name;
 		@Field(name = "first-name") String firstName;
 		@Field(name = "last-name") String lastName;
-		@Field(name = "birth-date", type = FieldType.Date, format = DateFormat.custom,
-				pattern = "dd.MM.uuuu") LocalDate birthDate;
+		@Field(name = "birth-date", type = FieldType.Date, format = {}, pattern = "dd.MM.uuuu") LocalDate birthDate;
 		Gender gender;
 		Address address;
 

src/test/java/org/springframework/data/elasticsearch/core/index/MappingBuilderUnitTests.java

@@ -921,7 +921,7 @@ static class FieldMappingParameters {
 		@Nullable @Field(copyTo = { "foo", "bar" }) private String copyTo;
 		@Nullable @Field(ignoreAbove = 42) private String ignoreAbove;
 		@Nullable @Field(type = FieldType.Integer) private String type;
-		@Nullable @Field(type = FieldType.Date, format = DateFormat.custom, pattern = "YYYYMMDD") private LocalDate date;
+		@Nullable @Field(type = FieldType.Date, format = {}, pattern = "YYYYMMDD") private LocalDate date;
 		@Nullable @Field(analyzer = "ana", searchAnalyzer = "sana", normalizer = "norma") private String analyzers;
 		@Nullable @Field(type = Keyword) private String docValuesTrue;
 		@Nullable @Field(type = Keyword, docValues = false) private String docValuesFalse;