public Object next() {
String pathComp = toks.nextToken();
// see if this is an attribute
Attribute attr = currentEnt.getAttribute(pathComp);
if (attr != null) {
// do a sanity check...
if (toks.hasMoreTokens()) {
throw new ExpressionException(
"Attribute must be the last component of the path: '" + pathComp + "'.", path, null);
}
return attr;
}
Relationship rel = currentEnt.getRelationship(pathComp);
if (rel != null) {
currentEnt = rel.getTargetEntity();
return rel;
}
// build error message
StringBuffer buf = new StringBuffer();
buf.append("Can't resolve path component: [")
.append(currentEnt.getName())
.append('.')
.append(pathComp)
.append("].");
throw new ExpressionException(buf.toString(), path, null);
}
public CayenneMapEntry next() {
String pathComp = toks.nextToken();
// see if this is an attribute
Attribute attr = currentEnt.getAttribute(pathComp);
if (attr != null) {
// do a sanity check...
if (toks.hasMoreTokens())
throw new ExpressionException(
"Attribute must be the last component of the path: '" + pathComp + "'.", path, null);
return attr;
}
Relationship rel = currentEnt.getRelationship(pathComp);
if (rel != null) {
currentEnt = rel.getTargetEntity();
if (currentEnt != null || !toks.hasMoreTokens()) { // otherwise an exception will be thrown
return rel;
}
}
String entityName = (currentEnt != null) ? currentEnt.getName() : "(?)";
// build error message
StringBuilder buf = new StringBuilder();
buf.append("Can't resolve path component: [")
.append(entityName)
.append('.')
.append(pathComp)
.append("].");
throw new ExpressionException(buf.toString(), path, null);
}
/**
* Returns a relationship that has a specified entity as a target. If there is more than one
* relationship for the same target, it is unpredictable which one will be returned.
*
* @since 1.1
*/
public Relationship getAnyRelationship(Entity targetEntity) {
if (getRelationships().isEmpty()) return null;
for (Relationship r : getRelationships()) {
if (r.getTargetEntity() == targetEntity) return r;
}
return null;
}
/**
* Returns a relationship that has a specified entity as a target. If there is more than one
* relationship for the same target, it is unpredictable which one will be returned.
*
* @since 1.1
*/
public Relationship getAnyRelationship(Entity targetEntity) {
Collection relationships = getRelationships();
if (relationships.isEmpty()) {
return null;
}
Iterator it = relationships.iterator();
while (it.hasNext()) {
Relationship r = (Relationship) it.next();
if (r.getTargetEntity() == targetEntity) {
return r;
}
}
return null;
}
