io.ebean.bean.ObjectGraphNode Maven / Gradle / Ivy
package io.ebean.bean;
import java.io.Serializable;
import java.util.Objects;
/**
* Identifies a unique node of an object graph.
*
* It represents a location relative to the root of an object graph and specific
* to a query and call stack hash.
*/
public final class ObjectGraphNode implements Serializable {
private static final long serialVersionUID = 2087081778650228996L;
/**
* Identifies the origin.
*/
private final ObjectGraphOrigin origin;
/**
* The path relative to the root.
*/
private final String path;
/**
* Create at a sub level.
*/
public ObjectGraphNode(ObjectGraphNode parent, String path) {
this.origin = parent.origin();
this.path = parent.childPath(path);
}
/**
* Create an the root level.
*/
public ObjectGraphNode(ObjectGraphOrigin origin, String path) {
this.origin = origin;
this.path = path;
}
/**
* Return the origin query point.
*/
public ObjectGraphOrigin origin() {
return origin;
}
private String childPath(String childPath) {
if (path == null) {
return childPath;
} else if (childPath == null) {
return path;
} else {
return path + "." + childPath;
}
}
/**
* Return the path relative to the root.
*/
public String path() {
return path;
}
@Override
public String toString() {
return "origin:" + origin + " path[" + path + "]";
}
@Override
public int hashCode() {
int hc = 92821 * origin.hashCode();
hc = 92821 * hc + (path == null ? 0 : path.hashCode());
return hc;
}
@Override
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof ObjectGraphNode)) {
return false;
}
ObjectGraphNode e = (ObjectGraphNode) obj;
return (Objects.equals(e.path, path))
&& e.origin.equals(origin);
}
}