com.avaje.ebean.bean.ObjectGraphNode Maven / Gradle / Ivy
package com.avaje.ebean.bean;
import java.io.Serializable;
/**
* 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 originQueryPoint;
/**
* The path relative to the root.
*/
private final String path;
/**
* Create at a sub level.
*/
public ObjectGraphNode(ObjectGraphNode parent, String path) {
this.originQueryPoint = parent.getOriginQueryPoint();
this.path = parent.getChildPath(path);
}
/**
* Create an the root level.
*/
public ObjectGraphNode(ObjectGraphOrigin originQueryPoint, String path) {
this.originQueryPoint = originQueryPoint;
this.path = path;
}
/**
* Return the origin query point.
*/
public ObjectGraphOrigin getOriginQueryPoint() {
return originQueryPoint;
}
private String getChildPath(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 getPath() {
return path;
}
public String toString() {
return "origin:" + originQueryPoint + " path[" + path+"]";
}
public int hashCode() {
int hc = 31 * originQueryPoint.hashCode();
hc = 31 * hc + (path == null ? 0 : path.hashCode());
return hc;
}
public boolean equals(Object obj) {
if (obj == this) {
return true;
}
if (!(obj instanceof ObjectGraphNode)) {
return false;
}
ObjectGraphNode e = (ObjectGraphNode) obj;
//noinspection StringEquality
return ((e.path == path) || (e.path != null && e.path.equals(path)))
&& e.originQueryPoint.equals(originQueryPoint);
}
}