org.springframework.data.relational.core.conversion.PathNode Maven / Gradle / Ivy
/*
* Copyright 2019-2023 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.relational.core.conversion;
import org.springframework.data.mapping.PersistentPropertyPath;
import org.springframework.data.relational.core.mapping.RelationalPersistentProperty;
import org.springframework.data.util.Pair;
import org.springframework.lang.Nullable;
/**
* Represents a single entity in an aggregate along with its property path from the root entity and the chain of objects
* to traverse a long this path.
*
* @author Jens Schauder
*/
final class PathNode {
/**
* The path to this entity
*/
private final PersistentPropertyPath path;
/**
* The parent {@link PathNode}. This is {@code null} if this is the root entity.
*/
@Nullable private final PathNode parent;
/**
* The value of the entity.
*/
private final Object value;
PathNode(PersistentPropertyPath path, @Nullable PathNode parent, Object value) {
this.path = path;
this.parent = parent;
this.value = value;
}
/**
* If the node represents a qualified property (i.e. a {@link java.util.List} or {@link java.util.Map}) the actual
* value is an element of the {@literal List} or a value of the {@literal Map}, while the {@link #value} is actually a
* {@link Pair} with the index or key as the first element and the actual value as second element.
*/
Object getActualValue() {
return getPath().getRequiredLeafProperty().isQualified() //
? ((Pair) getValue()).getSecond() //
: getValue();
}
public PersistentPropertyPath getPath() {
return this.path;
}
@Nullable
public PathNode getParent() {
return this.parent;
}
public Object getValue() {
return this.value;
}
@Override
public String toString() {
return "PathNode{" + "path=" + path + ", parent=" + parent + ", value=" + value + '}';
}
}