org.springframework.data.mapping.PersistentProperty Maven / Gradle / Ivy
/*
* Copyright 2011-2023 the original author or authors.
*
* 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
*
* https://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.springframework.data.mapping;
import java.lang.annotation.Annotation;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Collection;
import java.util.Map;
import org.springframework.core.annotation.AnnotatedElementUtils;
import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.data.util.TypeInformation;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* @author Graeme Rocher
* @author Jon Brisbin
* @author Oliver Gierke
* @author Mark Paluch
* @author Jens Schauder
* @author Christoph Strobl
* @author Johannes Englmeier
*/
public interface PersistentProperty> {
/**
* Returns the {@link PersistentEntity} owning the current {@link PersistentProperty}.
*
* @return never {@literal null}.
*/
PersistentEntity getOwner();
/**
* The name of the property
*
* @return The property name
*/
String getName();
/**
* The type of the property
*
* @return The property type
*/
Class getType();
/**
* Returns the {@link TypeInformation} of the property.
*
* @return
*/
TypeInformation getTypeInformation();
/**
* Returns the detected {@link TypeInformation TypeInformations} if the property references a
* {@link PersistentEntity}. Will return an {@literal empty} {@link Iterable} in case it refers to a simple type. Will
* return the {@link Collection}'s component types or the {@link Map}'s value type transparently.
*
* @return never {@literal null}.
* @since 2.6
*/
Iterable> getPersistentEntityTypeInformation();
/**
* Returns the getter method to access the property value if available. Might return {@literal null} in case there is
* no getter method with a return type assignable to the actual property's type.
*
* @return the getter method to access the property value if available, otherwise {@literal null}.
*/
@Nullable
Method getGetter();
default Method getRequiredGetter() {
Method getter = getGetter();
if (getter == null) {
throw new IllegalArgumentException(String.format("No getter available for persistent property %s", this));
}
return getter;
}
/**
* Returns the setter method to set a property value. Might return {@literal null} in case there is no setter
* available.
*
* @return the setter method to set a property value if available, otherwise {@literal null}.
*/
@Nullable
Method getSetter();
default Method getRequiredSetter() {
Method setter = getSetter();
if (setter == null) {
throw new IllegalArgumentException(String.format("No setter available for persistent property %s", this));
}
return setter;
}
/**
* Returns the with {@link Method} to set a property value on a new object instance. Might return {@literal null} in
* case there is no with available.
*
* With {@link Method methods} are property-bound instance {@link Method methods} that accept a single argument of the
* property type creating a new object instance.
*
*
* class Person {
* final String id;
* final String name;
*
* // …
*
* Person withName(String name) {
* return new Person(this.id, name);
* }
* }
*
*
* @return the with {@link Method} to set a property value on a new object instance if available, otherwise
* {@literal null}.
* @since 2.1
*/
@Nullable
Method getWither();
default Method getRequiredWither() {
Method wither = getWither();
if (wither == null) {
throw new IllegalArgumentException(String.format("No wither available for persistent property %s", this));
}
return wither;
}
@Nullable
Field getField();
default Field getRequiredField() {
Field field = getField();
if (field == null) {
throw new IllegalArgumentException(String.format("No field backing persistent property %s", this));
}
return field;
}
/**
* @return {@literal null} if no expression defined.
*/
@Nullable
String getSpelExpression();
/**
* @return {@literal null} if property is not part of an {@link Association}.
*/
@Nullable
Association getAssociation();
/**
* Get the {@link Association} of this property.
*
* @return never {@literal null}.
* @throws IllegalStateException if not involved in an {@link Association}.
*/
default Association
getRequiredAssociation() {
Association
association = getAssociation();
if (association != null) {
return association;
}
throw new IllegalStateException("No association found");
}
/**
* Returns whether the type of the {@link PersistentProperty} is actually to be regarded as {@link PersistentEntity}
* in turn.
*
* @return {@literal true} a {@link PersistentEntity}.
*/
boolean isEntity();
/**
* Returns whether the property is a potential identifier property of the owning {@link PersistentEntity}.
* This method is mainly used by {@link PersistentEntity} implementation to discover id property candidates on
* {@link PersistentEntity} creation you should rather call {@link PersistentEntity#isIdProperty(PersistentProperty)}
* to determine whether the current property is the id property of that {@link PersistentEntity} under consideration.
*
* @return {@literal true} if the {@literal id} property.
*/
boolean isIdProperty();
/**
* Returns whether the current property is a potential version property of the owning
* {@link PersistentEntity}. This method is mainly used by {@link PersistentEntity} implementation to discover version
* property candidates on {@link PersistentEntity} creation you should rather call
* {@link PersistentEntity#isVersionProperty(PersistentProperty)} to determine whether the current property is the
* version property of that {@link PersistentEntity} under consideration.
*
* @return
*/
boolean isVersionProperty();
/**
* Returns whether the property is a {@link Collection}, {@link Iterable} or an array.
*
* @return
*/
boolean isCollectionLike();
/**
* Returns whether the property is a {@link Map}.
*
* @return
*/
boolean isMap();
/**
* Returns whether the property is an array.
*
* @return
*/
boolean isArray();
/**
* Returns whether the property is transient.
*
* @return
*/
boolean isTransient();
/**
* Returns whether the current property is writable, i.e. if the value held for it shall be written to the data store.
*
* @return
* @since 1.9
*/
boolean isWritable();
/**
* Returns whether the current property is readable through {@link PersistentPropertyAccessor}, i.e. if it is not
* {@link #isTransient()}, if the value can be set on the current instance or read to create a new instance as per
* {@link #getWither()} or via Kotlin Copy methods.
*
* @return
* @since 3.2
*/
boolean isReadable();
/**
* Returns whether the current property is immutable, i.e. if there is no setter or the backing {@link Field} is
* {@code final}.
*
* @return
* @see java.lang.reflect.Modifier#isFinal(int)
* @since 2.1
*/
boolean isImmutable();
/**
* Returns whether the property is an {@link Association}.
*
* @return
*/
boolean isAssociation();
/**
* Returns the component type of the type if it is a {@link java.util.Collection}. Will return the type of the key if
* the property is a {@link java.util.Map}.
*
* @return the component type, the map's key type or {@literal null} if neither {@link java.util.Collection} nor
* {@link java.util.Map}.
*/
@Nullable
Class getComponentType();
/**
* Returns the raw type as it's pulled from from the reflected property.
*
* @return the raw type of the property.
*/
Class getRawType();
/**
* Returns the type of the values if the property is a {@link java.util.Map}.
*
* @return the map's value type or {@literal null} if no {@link java.util.Map}
*/
@Nullable
Class getMapValueType();
/**
* Returns the actual type of the property. This will be the original property type if no generics were used, the
* component type for collection-like types and arrays as well as the value type for map properties.
*
* @return
*/
Class getActualType();
/**
* Looks up the annotation of the given type on the {@link PersistentProperty}. Will inspect accessors and the
* potentially backing field and traverse accessor methods to potentially available super types.
*
* @param annotationType the annotation to look up, must not be {@literal null}.
* @return the annotation of the given type. Can be {@literal null}.
* @see AnnotationUtils#findAnnotation(Method, Class)
*/
@Nullable
A findAnnotation(Class annotationType);
/**
* Looks up the annotation of the given type on the {@link PersistentProperty}. Will inspect accessors and the
* potentially backing field and traverse accessor methods to potentially available super types.
*
* @param annotationType the annotation to look up, must not be {@literal null}.
* @return the annotation of the given type.
* @throws IllegalStateException if the required {@code annotationType} is not found.
* @since 2.0
*/
default A getRequiredAnnotation(Class annotationType) throws IllegalStateException {
A annotation = findAnnotation(annotationType);
if (annotation != null) {
return annotation;
}
throw new IllegalStateException(
String.format("Required annotation %s not found for %s", annotationType, getName()));
}
/**
* Looks up the annotation of the given type on the property and the owning type if no annotation can be found on it.
* Useful to lookup annotations that can be configured on the type but overridden on an individual property.
*
* @param annotationType must not be {@literal null}.
* @return the annotation of the given type. Can be {@literal null}.
*/
@Nullable
A findPropertyOrOwnerAnnotation(Class annotationType);
/**
* Returns whether the {@link PersistentProperty} has an annotation of the given type.
*
* @param annotationType the annotation to lookup, must not be {@literal null}.
* @return whether the {@link PersistentProperty} has an annotation of the given type.
*/
boolean isAnnotationPresent(Class annotationType);
/**
* Returns whether property access shall be used for reading the property value. This means it will use the getter
* instead of field access.
*
* @return
*/
boolean usePropertyAccess();
/**
* Returns whether the actual type of the property carries the given annotation.
*
* @param annotationType must not be {@literal null}.
* @return
* @since 2.1
* @see #getActualType()
*/
default boolean hasActualTypeAnnotation(Class annotationType) {
Assert.notNull(annotationType, "Annotation type must not be null");
return AnnotatedElementUtils.hasAnnotation(getActualType(), annotationType);
}
/**
* Return the type the property refers to in case it's an association, i.e. {@link #isAssociation()} returns
* {@literal true}. That means, that implementations must return a non-{@literal null} value from this method
* in that case. We also recommend to return {@literal null} for non-associations right away to establish symmetry
* between this method and {@link #isAssociation()}.
*
* @return the type the property refers to in case it's an association, i.e. {@link #isAssociation()} returns
* {@literal true}.
* @since 2.1
*/
@Nullable
Class getAssociationTargetType();
/**
* Return the type the property refers to in case it's an association, i.e. {@link #isAssociation()} returns
* {@literal true}. That means, that implementations must return a non-{@literal null} value from this method
* in that case. We also recommend to return {@literal null} for non-associations right away to establish symmetry
* between this method and {@link #isAssociation()}.
*
* @return the type the property refers to in case it's an association, i.e. {@link #isAssociation()} returns
* {@literal true}.
* @since 2.6
*/
@Nullable
TypeInformation getAssociationTargetTypeInformation();
/**
* Returns a {@link PersistentPropertyAccessor} for the current property's owning value.
*
* @param owner must not be {@literal null}.
* @return will never be {@literal null}.
* @since 2.3
*/
default PersistentPropertyAccessor getAccessorForOwner(T owner) {
Assert.notNull(owner, "Owner must not be null");
return getOwner().getPropertyAccessor(owner);
}
}