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The AWS Java SDK for Amazon DynamoDB module holds the client classes that are used for communicating with Amazon DynamoDB Service
/*
* Copyright 2016-2021 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed 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://aws.amazon.com/apache2.0
*
* This file 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 com.amazonaws.services.dynamodbv2.datamodeling;
import static com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBAutoGenerateStrategy.CREATE;
import static com.amazonaws.services.dynamodbv2.model.KeyType.HASH;
import static com.amazonaws.services.dynamodbv2.model.KeyType.RANGE;
import com.amazonaws.annotation.SdkInternalApi;
import com.amazonaws.services.dynamodbv2.datamodeling.DynamoDBMapperFieldModel.DynamoDBAttributeType;
import com.amazonaws.services.dynamodbv2.model.KeyType;
import com.amazonaws.util.StringUtils;
import java.lang.annotation.Annotation;
import java.lang.reflect.AnnotatedElement;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Collections;
import java.util.EnumMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
/**
* Map of DynamoDB annotations.
*/
@SdkInternalApi
final class StandardAnnotationMaps {
/**
* Gets all the DynamoDB annotations for a given class.
*/
static final TableMap of(Class clazz) {
final TableMap annotations = new TableMap(clazz);
annotations.putAll(clazz);
return annotations;
}
/**
* Gets all the DynamoDB annotations; method annotations override field
* level annotations which override class/type level annotations.
*/
static final FieldMap of(Method getter, String defaultName) {
final Class targetType = (Class)getter.getReturnType();
final String fieldName = StandardBeanProperties.fieldNameOf(getter);
Field declaredField = null;
try {
declaredField = getter.getDeclaringClass().getDeclaredField(fieldName);
} catch (final SecurityException e) {
throw new DynamoDBMappingException("no access to field for " + getter, e);
} catch (final NoSuchFieldException no) {}
if (defaultName == null) {
defaultName = fieldName;
}
final FieldMap annotations = new FieldMap(targetType, defaultName);
annotations.putAll(targetType);
annotations.putAll(declaredField);
annotations.putAll(getter);
return annotations;
}
/**
* Common type-conversions properties.
*/
private static abstract class AbstractAnnotationMap {
private final Annotations map = new Annotations();
/**
* Gets the actual annotation by type; if the type is not directly
* mapped then the meta-annotation is returned.
*/
final A actualOf(final Class annotationType) {
final Annotation annotation = this.map.get(annotationType);
if (annotation == null || annotation.annotationType() == annotationType) {
return (A)annotation;
} else if (annotation.annotationType().isAnnotationPresent(annotationType)) {
return annotation.annotationType().getAnnotation(annotationType);
}
throw new DynamoDBMappingException(
"could not resolve annotation by type" +
"; @" + annotationType.getSimpleName() + " not present on " + annotation
);
}
/**
* Puts all DynamoDB annotations into the map.
*/
final void putAll(AnnotatedElement annotated) {
if (annotated != null) {
this.map.putAll(new Annotations().putAll(annotated.getAnnotations()));
}
}
}
/**
* Common type-conversions properties.
*/
static abstract class TypedMap extends AbstractAnnotationMap {
private final Class targetType;
private TypedMap(final Class targetType) {
this.targetType = targetType;
}
/**
* Gets the target type.
*/
final Class targetType() {
return this.targetType;
}
/**
* Gets the attribute type from the {@link DynamoDBTyped} annotation
* if present.
*/
public DynamoDBAttributeType attributeType() {
final DynamoDBTyped annotation = actualOf(DynamoDBTyped.class);
if (annotation != null) {
return annotation.value();
}
return null;
}
/**
* Creates a new type-converter form the {@link DynamoDBTypeConverted}
* annotation if present.
*/
public DynamoDBTypeConverter typeConverter() {
Annotation annotation = super.map.get(DynamoDBTypeConverted.class);
if (annotation != null) {
final DynamoDBTypeConverted converted = actualOf(DynamoDBTypeConverted.class);
annotation = (converted == annotation ? null : annotation);
return overrideOf(converted.converter(), targetType, annotation);
}
return null;
}
/**
* Creates a new auto-generator from the {@link DynamoDBAutoGenerated}
* annotation if present.
*/
public DynamoDBAutoGenerator autoGenerator() {
Annotation annotation = super.map.get(DynamoDBAutoGenerated.class);
if (annotation != null) {
final DynamoDBAutoGenerated generated = actualOf(DynamoDBAutoGenerated.class);
annotation = (generated == annotation ? null : annotation);
DynamoDBAutoGenerator generator = overrideOf(generated.generator(), targetType, annotation);
if (generator.getGenerateStrategy() == CREATE && targetType.isPrimitive()) {
throw new DynamoDBMappingException(
"type [" + targetType + "] is not supported for auto-generation" +
"; primitives are not allowed when auto-generate strategy is CREATE"
);
}
return generator;
}
return null;
}
/**
* Maps the attributes from the {@link DynamoDBFlattened} annotation.
*/
public Map attributes() {
final Map attributes = new LinkedHashMap();
for (final DynamoDBAttribute a : actualOf(DynamoDBFlattened.class).attributes()) {
if (a.mappedBy().isEmpty() || a.attributeName().isEmpty()) {
throw new DynamoDBMappingException("@DynamoDBFlattened must specify mappedBy and attributeName");
} else if (attributes.put(a.mappedBy(), a.attributeName()) != null) {
throw new DynamoDBMappingException("@DynamoDBFlattened must not duplicate mappedBy=" + a.mappedBy());
}
}
if (attributes.isEmpty()) {
throw new DynamoDBMappingException("@DynamoDBFlattened must specify one or more attributes");
}
return attributes;
}
/**
* Returns true if the {@link DynamoDBFlattened} annotation is present.
*/
public boolean flattened() {
return actualOf(DynamoDBFlattened.class) != null;
}
}
/**
* {@link DynamoDBMapperTableModel} annotations.
*/
static final class TableMap extends TypedMap implements DynamoDBMapperTableModel.Properties {
private TableMap(final Class targetType) {
super(targetType);
}
/**
* {@inheritDoc}
*/
@Override
public DynamoDBAttributeType attributeType() {
DynamoDBAttributeType attributeType = super.attributeType();
if (attributeType == null && actualOf(DynamoDBTable.class) != null) {
attributeType = DynamoDBAttributeType.M;
}
return attributeType;
}
/**
* {@inheritDoc}
*/
@Override
public String tableName() {
final DynamoDBTable annotation = actualOf(DynamoDBTable.class);
if (annotation != null && !annotation.tableName().isEmpty()) {
return annotation.tableName();
}
return null;
}
}
/**
* {@link DynamoDBMapperFieldModel} annotations.
*/
static final class FieldMap extends TypedMap implements DynamoDBMapperFieldModel.Properties {
private final String defaultName;
private FieldMap(Class targetType, String defaultName) {
super(targetType);
this.defaultName = defaultName;
}
/**
* Returns true if the {@link DynamoDBIgnore} annotation is present.
*/
public boolean ignored() {
return actualOf(DynamoDBIgnore.class) != null;
}
/**
* {@inheritDoc}
*/
@Override
public DynamoDBAttributeType attributeType() {
final DynamoDBScalarAttribute annotation = actualOf(DynamoDBScalarAttribute.class);
if (annotation != null) {
if (Set.class.isAssignableFrom(targetType())) {
return DynamoDBAttributeType.valueOf(annotation.type().name() + "S");
} else {
return DynamoDBAttributeType.valueOf(annotation.type().name());
}
}
return super.attributeType();
}
/**
* {@inheritDoc}
*/
@Override
public String attributeName() {
final DynamoDBHashKey hashKey = actualOf(DynamoDBHashKey.class);
if (hashKey != null && !hashKey.attributeName().isEmpty()) {
return hashKey.attributeName();
}
final DynamoDBIndexHashKey indexHashKey = actualOf(DynamoDBIndexHashKey.class);
if (indexHashKey != null && !indexHashKey.attributeName().isEmpty()) {
return indexHashKey.attributeName();
}
final DynamoDBRangeKey rangeKey = actualOf(DynamoDBRangeKey.class);
if (rangeKey != null && !rangeKey.attributeName().isEmpty()) {
return rangeKey.attributeName();
}
final DynamoDBIndexRangeKey indexRangeKey = actualOf(DynamoDBIndexRangeKey.class);
if (indexRangeKey != null && !indexRangeKey.attributeName().isEmpty()) {
return indexRangeKey.attributeName();
}
final DynamoDBAttribute attribute = actualOf(DynamoDBAttribute.class);
if (attribute != null && !attribute.attributeName().isEmpty()) {
return attribute.attributeName();
}
final DynamoDBVersionAttribute versionAttribute = actualOf(DynamoDBVersionAttribute.class);
if (versionAttribute != null && !versionAttribute.attributeName().isEmpty()) {
return versionAttribute.attributeName();
}
final DynamoDBScalarAttribute scalarAttribute = actualOf(DynamoDBScalarAttribute.class);
if (scalarAttribute != null && !scalarAttribute.attributeName().isEmpty()) {
return scalarAttribute.attributeName();
}
final DynamoDBNamed annotation = actualOf(DynamoDBNamed.class);
if (annotation != null && !annotation.value().isEmpty()) {
return annotation.value();
}
return this.defaultName;
}
/**
* {@inheritDoc}
*/
@Override
public KeyType keyType() {
final DynamoDBKeyed annotation = actualOf(DynamoDBKeyed.class);
if (annotation != null) {
return annotation.value();
}
return null;
}
/**
* {@inheritDoc}
*/
@Override
public boolean versioned() {
return actualOf(DynamoDBVersioned.class) != null;
}
/**
* {@inheritDoc}
*/
@Override
public Map> globalSecondaryIndexNames() {
final Map> gsis = new EnumMap>(KeyType.class);
final DynamoDBIndexHashKey indexHashKey = actualOf(DynamoDBIndexHashKey.class);
if (indexHashKey != null) {
if (!indexHashKey.globalSecondaryIndexName().isEmpty()) {
if (indexHashKey.globalSecondaryIndexNames().length > 0) {
throw new DynamoDBMappingException("@DynamoDBIndexHashKey must not specify both HASH GSI name/names");
}
gsis.put(HASH, Collections.singletonList(indexHashKey.globalSecondaryIndexName()));
} else if (indexHashKey.globalSecondaryIndexNames().length > 0) {
gsis.put(HASH, Collections.unmodifiableList(Arrays.asList(indexHashKey.globalSecondaryIndexNames())));
} else {
throw new DynamoDBMappingException("@DynamoDBIndexHashKey must specify one of HASH GSI name/names");
}
}
final DynamoDBIndexRangeKey indexRangeKey = actualOf(DynamoDBIndexRangeKey.class);
if (indexRangeKey != null) {
if (!indexRangeKey.globalSecondaryIndexName().isEmpty()) {
if (indexRangeKey.globalSecondaryIndexNames().length > 0) {
throw new DynamoDBMappingException("@DynamoDBIndexRangeKey must not specify both RANGE GSI name/names");
}
gsis.put(RANGE, Collections.singletonList(indexRangeKey.globalSecondaryIndexName()));
} else if (indexRangeKey.globalSecondaryIndexNames().length > 0) {
gsis.put(RANGE, Collections.unmodifiableList(Arrays.asList(indexRangeKey.globalSecondaryIndexNames())));
} else if (localSecondaryIndexNames().isEmpty()) {
throw new DynamoDBMappingException("@DynamoDBIndexRangeKey must specify RANGE GSI and/or LSI name/names");
}
}
if (!gsis.isEmpty()) {
return Collections.unmodifiableMap(gsis);
}
return Collections.>emptyMap();
}
/**
* {@inheritDoc}
*/
@Override
public List localSecondaryIndexNames() {
final DynamoDBIndexRangeKey annotation = actualOf(DynamoDBIndexRangeKey.class);
if (annotation != null) {
if (!annotation.localSecondaryIndexName().isEmpty()) {
if (annotation.localSecondaryIndexNames().length > 0) {
throw new DynamoDBMappingException("@DynamoDBIndexRangeKey must not specify both LSI name/names");
}
return Collections.singletonList(annotation.localSecondaryIndexName());
} else if (annotation.localSecondaryIndexNames().length > 0) {
return Collections.unmodifiableList(Arrays.asList(annotation.localSecondaryIndexNames()));
}
}
return Collections.emptyList();
}
}
/**
* A map of annotation type to annotation. It will map any first level
* custom annotations to any DynamoDB annotation types that are present.
* It will support up to two levels of compounded DynamoDB annotations.
*/
private static final class Annotations extends LinkedHashMap,Annotation> {
private static final long serialVersionUID = -1L;
/**
* Puts the annotation if it's DynamoDB; ensures there are no conflicts.
*/
public boolean putIfAnnotated(Class annotationType, Annotation annotation) {
if (!annotationType.isAnnotationPresent(DynamoDB.class)) {
return false;
} else if ((annotation = put(annotationType, annotation)) == null) {
return true;
}
throw new DynamoDBMappingException(
"conflicting annotations " + annotation + " and " + get(annotationType) +
"; allowed only one of @" + annotationType.getSimpleName()
);
}
/**
* Puts all DynamoDB annotations and meta-annotations in the map.
*/
public Annotations putAll(Annotation ... annotations) {
for (final Annotation a1 : annotations) {
putIfAnnotated(a1.annotationType(), a1);
for (final Annotation a2 : a1.annotationType().getAnnotations()) {
if (putIfAnnotated(a2.annotationType(), a1)) {
for (final Annotation a3 : a2.annotationType().getAnnotations()) {
putIfAnnotated(a3.annotationType(), a2);
}
}
}
}
return this;
}
}
/**
* Creates a new instance of the clazz with the target type and annotation
* as parameters if available.
*/
private static T overrideOf(Class clazz, Class targetType, Annotation annotation) {
try {
if (annotation != null) {
try {
return clazz.getConstructor(Class.class, annotation.annotationType()).newInstance(targetType, annotation);
} catch (final NoSuchMethodException no) {}
}
try {
return clazz.getConstructor(Class.class).newInstance(targetType);
} catch (final NoSuchMethodException no) {}
return clazz.newInstance();
} catch (final Exception e) {
throw new DynamoDBMappingException("could not instantiate " + clazz, e);
}
}
}