package org.nutz.dao.impl.entity.field;
import java.util.Collection;
import java.util.Map;
import org.nutz.castor.Castors;
import org.nutz.dao.entity.Entity;
import org.nutz.dao.entity.LinkField;
import org.nutz.dao.entity.MappingField;
import org.nutz.dao.impl.EntityHolder;
import org.nutz.dao.impl.entity.info.LinkInfo;
import org.nutz.dao.impl.sql.pojo.PojoFetchEntityCallback;
import org.nutz.dao.impl.sql.pojo.PojoQueryEntityCallback;
import org.nutz.dao.sql.PojoCallback;
import org.nutz.lang.Mirror;
public abstract class AbstractLinkField extends AbstractEntityField implements LinkField {
protected EntityHolder holder;
protected Class<?> targetType;
protected Entity<?> target;
private PojoCallback callback;
protected String mapKey;
protected MappingField hostField;
protected MappingField linkedField;
private boolean[] lock = new boolean[0];//最小化的锁对象
public AbstractLinkField(Entity<?> entity, EntityHolder holder, LinkInfo info) {
super(entity);
this.holder = holder;
this.setName(info.name);
this.setInjecting(info.injecting);
this.setEjecting(info.ejecting);
this.setType(info.fieldType);
if (getTypeMirror().isOf(Collection.class)) {
callback = new PojoQueryEntityCallback();
} else if (getTypeMirror().isOf(Map.class)) {
callback = new PojoQueryEntityCallback();
} else if (getTypeClass().isArray()) {
callback = new PojoQueryEntityCallback();
} else {
callback = new PojoFetchEntityCallback();
}
}
@Override
public void setValue(Object obj, Object value) {
if (null != value) {
if (!Mirror.me(value).canCastToDirectly(this.getTypeClass()))
value = Castors.me().cast(value, value.getClass(), this.getTypeClass(), mapKey);
}
super.setValue(obj, value);
}
public Entity<?> getLinkedEntity() {
if (null == target) {
synchronized (lock) {
if (null == target) {
if (targetType.equals(getEntity().getType()))
target = getEntity();
else
target = holder.getEntity(targetType);
}
}
}
return target;
}
public PojoCallback getCallback() {
return callback;
}
public MappingField getHostField() {
return hostField;
}
public MappingField getLinkedField() {
return linkedField;
}
}