Jakarta-Common-BeanUtils研究心得(二)

java 代码

// Convert this list into the internal data structures we need
properties =
(DynaProperty[]) list.toArray(new DynaProperty[list.size()]);
for (int i = 0; i < properties.length; i++) {
propertiesMap.put(properties[i].getName(), properties[i]);
}

}

/**
* <p>Factory method to create a new DynaProperty for the given index
* into the result set metadata.</p>
*
* @param metadata is the result set metadata
* @param i is the column index in the metadata
* @return the newly created DynaProperty instance
*/
protected DynaProperty createDynaProperty(
ResultSetMetaData metadata,
int i)
throws SQLException {

String name = null;
if (lowerCase) {
name = metadata.getColumnName(i).toLowerCase();
} else {
name = metadata.getColumnName(i);
}
String className = null;
try {
className = metadata.getColumnClassName(i);
} catch (SQLException e) {
// this is a patch for HsqlDb to ignore exceptions
// thrown by its metadata implementation
}

// Default to Object type if no class name could be retrieved
// from the metadata
Class clazz = Object.class;
if (className != null) {
clazz = loadClass(className);
}
return new DynaProperty(name, clazz);

}

/**
* <p>Loads and returns the <code>Class</code> of the given name.
* By default, a load from the thread context class loader is attempted.
* If there is no such class loader, the class loader used to load this
* class will be utilized.</p>
*
* @exception SQLException if an exception was thrown trying to load
*  the specified class
*/
protected Class loadClass(String className) throws SQLException {

try {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (cl == null) {
cl = this.getClass().getClassLoader();
}
return (cl.loadClass(className));
} catch (Exception e) {
throw new SQLException(
"Cannot load column class '" + className + "': " + e);
}

}

}

大部分代码从BeanUtils的源码中取得，只做了简单的修改，没有加多余的注释。如果要正式使用，
需要再做精加工。