hello
i'm new to this list and i'd like to thank you first for sharing this
project. it looks like a very interesting approach to me in the world
of hibernate &co.
i'm right now trying on with empire-db and as i'm going to need to
fill java.util.Set type of collections i did a tiny bit of change to
the DBReader class so it will populate any Collection that is put in
as a parameter. this will not break the existing api.
i will attach the diff just in case you find it useful.
regards
eike
Index: src/main/java/org/apache/empire/db/DBReader.java
===================================================================
--- src/main/java/org/apache/empire/db/DBReader.java (revision 791026)
+++ src/main/java/org/apache/empire/db/DBReader.java (working copy)
@@ -24,7 +24,9 @@
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;
+import java.util.Collection;
import java.util.HashMap;
+import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
@@ -623,17 +625,19 @@
}
/**
- * Returns the result of a query as a list of objects resticted
- * to a maximum number of objects (unless maxCount is -1).
+ * Returns the result of a query as a collection of objects
+ * restricted to a maximum number of objects (unless
+ * maxCount is -1).
*
* @param c the class type of the objects in the list
* @param maxCount the maximum number of objects
- * @param <T> the type of the objects in the list
+ * @param <T> the implementation type of {...@link Collection}
+ * @param <S> the type of the objects in the list
*
* @return the list of <T>
*/
@SuppressWarnings("unchecked")
- public <T> ArrayList<T> getBeanList(Class<T> c, int maxCount)
+ public <T extends Collection<S>, S> T getBeanList(T list, Class<S> c, int maxCount)
{
// Check Recordset
if (rset == null)
@@ -653,19 +657,19 @@
Object[] args = (ctor!=null) ? new Object[getFieldCount()] : null;
// Create a list of beans
- ArrayList<T> list = new ArrayList<T>();
+
while (moveNext() && maxCount != 0)
{ // Create bean an init
if (ctor!=null)
{ // Use Constructor
for (int i = 0; i < getFieldCount(); i++)
args[i] = getValue(i);
- T bean = (T)ctor.newInstance(args);
+ S bean = (S)ctor.newInstance(args);
list.add(bean);
}
else
{ // Use Property Setters
- T bean = c.newInstance();
+ S bean = c.newInstance();
if (getBeanProperties(bean)==false)
return null;
list.add(bean);
@@ -692,6 +696,33 @@
}
/**
+ * Returns the result of a query as a list of objects restricted
+ * to a maximum number of objects (unless maxCount is -1).
+ *
+ * @param c the class type of the objects in the list
+ * @param maxCount the maximum number of objects
+ * @param <T> the type of the objects in the list
+ *
+ * @return the list of <T>
+ */
+ public <T> ArrayList<T> getBeanList(Class<T> c, int maxCount) {
+ return getBeanList(new ArrayList<T>(), c, maxCount);
+ }
+
+ /**
+ * Returns the result of a query as a set of objects restricted
+ * to a maximum number of objects (unless maxCount=-1)
+ *
+ * @param <T> the type of the objects in the set
+ * @param c the class type of the objects in the set
+ * @param maxCount the maximum size of the list
+ * @return
+ */
+ public <T> HashSet<T> getBeanSet(Class<T> c, int maxCount) {
+ return getBeanList(new HashSet<T>(), c, maxCount);
+ }
+
+ /**
* Returns the result of a query as a list of objects.
*
* @param c the class type of the objects in the list
@@ -701,7 +732,7 @@
*/
public <T> ArrayList<T> getBeanList(Class<T> c)
{
- return getBeanList(c, -1);
+ return getBeanList(new ArrayList<T>(), c, -1);
}
/**
