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Axis2 Data Binding module
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.axis2.databinding.utils;
import java.lang.reflect.Array;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.Collection;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.Set;
/** Converter */
public class Converter {
public static Object convert(Object arg, Class destClass) {
if (destClass == null) {
return arg;
}
Class argHeldType = null;
if (arg != null) {
argHeldType = getHolderValueType(arg.getClass());
}
if (arg != null && argHeldType == null && destClass.isAssignableFrom(arg.getClass())) {
return arg;
}
// See if a previously converted value is stored in the argument.
Object destValue = null;
// Get the destination held type or the argument held type if they exist
Class destHeldType = getHolderValueType(destClass);
// Convert between Calendar and Date
if (arg instanceof Calendar && destClass == Date.class) {
return ((Calendar)arg).getTime();
}
if (arg instanceof Date && destClass == Calendar.class) {
Calendar calendar = Calendar.getInstance();
calendar.setTime((Date)arg);
return calendar;
}
// Convert between Calendar and java.sql.Date
if (arg instanceof Calendar && destClass == java.sql.Date.class) {
return new java.sql.Date(((Calendar)arg).getTime().getTime());
}
// Convert between HashMap and Hashtable
if (arg instanceof HashMap && destClass == Hashtable.class) {
return new Hashtable((HashMap)arg);
}
// If the destination is an array and the source
// is a suitable component, return an array with
// the single item.
if (arg != null &&
destClass.isArray() &&
!destClass.getComponentType().equals(Object.class) &&
destClass.getComponentType().isAssignableFrom(arg.getClass())) {
Object array =
Array.newInstance(destClass.getComponentType(), 1);
Array.set(array, 0, arg);
return array;
}
// Return if no conversion is available
if (!(arg instanceof Collection ||
(arg != null && arg.getClass().isArray())) &&
((destHeldType == null && argHeldType == null) ||
(destHeldType != null && argHeldType != null))) {
return arg;
}
// Flow to here indicates that neither arg or destClass is a Holder
if (arg == null) {
return arg;
}
// The arg may be an array or List
int length = 0;
if (arg.getClass().isArray()) {
length = Array.getLength(arg);
} else {
length = ((Collection)arg).size();
}
if (destClass.isArray()) {
if (destClass.getComponentType().isPrimitive()) {
Object array = Array.newInstance(destClass.getComponentType(),
length);
// Assign array elements
if (arg.getClass().isArray()) {
for (int i = 0; i < length; i++) {
Array.set(array, i, Array.get(arg, i));
}
} else {
int idx = 0;
for (Iterator i = ((Collection)arg).iterator();
i.hasNext();) {
Array.set(array, idx++, i.next());
}
}
destValue = array;
} else {
Object [] array;
try {
array = (Object [])Array.newInstance(destClass.getComponentType(),
length);
} catch (Exception e) {
return arg;
}
// Use convert to assign array elements.
if (arg.getClass().isArray()) {
for (int i = 0; i < length; i++) {
array[i] = convert(Array.get(arg, i),
destClass.getComponentType());
}
} else {
int idx = 0;
for (Iterator i = ((Collection)arg).iterator();
i.hasNext();) {
array[idx++] = convert(i.next(),
destClass.getComponentType());
}
}
destValue = array;
}
} else if (Collection.class.isAssignableFrom(destClass)) {
Collection newList = null;
try {
// if we are trying to create an interface, build something
// that implements the interface
if (destClass == Collection.class || destClass == java.util.List.class) {
newList = new ArrayList();
} else if (destClass == Set.class) {
newList = new HashSet();
} else {
newList = (Collection)destClass.newInstance();
}
} catch (Exception e) {
// Couldn't build one for some reason... so forget it.
return arg;
}
if (arg.getClass().isArray()) {
for (int j = 0; j < length; j++) {
newList.add(Array.get(arg, j));
}
} else {
for (Iterator j = ((Collection)arg).iterator();
j.hasNext();) {
newList.add(j.next());
}
}
destValue = newList;
} else {
destValue = arg;
}
return destValue;
}
private static Class getHolderValueType(Class aClass) {
return null;
}
}