package com.avaje.ebeaninternal.server.persist.dmlbind;
import com.avaje.ebean.bean.EntityBean;
import com.avaje.ebeaninternal.server.deploy.BeanDescriptor;
import com.avaje.ebeaninternal.server.deploy.BeanProperty;
import com.avaje.ebeaninternal.server.deploy.BeanPropertyAssocOne;
/**
* Matches local embedded id properties to 'matching' properties from a
* ManyToOne associated bean that is a 'imported primary key'.
* <p>
* This object is designed to help BindableIdEmbedded and BindableIdMap to
* create a concatenated id from the id values from ManyToOne associated beans.
* This can be done when those ManyToOne associated beans make up the primary
* key. This typically means the BindableIdEmbedded is for a intersection table
* of a Many to Many relationship.
* </p>
*/
class MatchedImportedProperty {
private final BeanPropertyAssocOne<?> assocOne;
private final BeanProperty foreignProp;
private final BeanProperty localProp;
protected MatchedImportedProperty(BeanPropertyAssocOne<?> assocOne, BeanProperty foreignProp,
BeanProperty localProp) {
this.assocOne = assocOne;
this.foreignProp = foreignProp;
this.localProp = localProp;
}
protected void populate(EntityBean sourceBean, EntityBean destBean) {
Object assocBean = assocOne.getValue(sourceBean);
if (assocBean == null) {
String msg = "The assoc bean for " + assocOne + " is null?";
throw new NullPointerException(msg);
}
Object value = foreignProp.getValue((EntityBean)assocBean);
localProp.setValue(destBean, value);
}
/**
* Create the array of matchedImportedProperty based on the properties and descriptor.
*/
protected static MatchedImportedProperty[] build(BeanProperty[] props, BeanDescriptor<?> desc) {
MatchedImportedProperty[] matches = new MatchedImportedProperty[props.length];
for (int i = 0; i < props.length; i++) {
// find matching assoc one property for dbColumn
matches[i] = MatchedImportedProperty.findMatch(props[i], desc);
if (matches[i] == null) {
// ok, the assoc ones are not on the bean?
return null;
}
}
return matches;
}
private static MatchedImportedProperty findMatch(BeanProperty prop, BeanDescriptor<?> desc) {
// find matching against the local database column
String dbColumn = prop.getDbColumn();
BeanPropertyAssocOne<?>[] assocOnes = desc.propertiesOne();
for (int i = 0; i < assocOnes.length; i++) {
if (assocOnes[i].isImportedPrimaryKey()) {
// search using the ImportedId from the assoc one
BeanProperty foreignMatch = assocOnes[i].getImportedId().findMatchImport(dbColumn);
if (foreignMatch != null) {
return new MatchedImportedProperty(assocOnes[i], foreignMatch, prop);
}
}
}
// there was no matching assoc one property.
// example UserRole bean missing assoc one to User?
return null;
}
}