/**
* 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.camel.component.salesforce.api;
import java.lang.reflect.Array;
import java.lang.reflect.Method;
import com.thoughtworks.xstream.converters.ConversionException;
import com.thoughtworks.xstream.converters.Converter;
import com.thoughtworks.xstream.converters.MarshallingContext;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.io.HierarchicalStreamWriter;
/**
* XStream converter for handling MSPs mapped to Picklist enum array fields.
*/
public class MultiSelectPicklistConverter implements Converter {
private static final String FACTORY_METHOD = "fromValue";
@Override
public void marshal(Object o, HierarchicalStreamWriter writer, MarshallingContext context) {
// get Picklist enum element class from array class
Class<?> arrayClass = o.getClass();
final Class<?> aClass = arrayClass.getComponentType();
try {
Method getterMethod = aClass.getMethod("value");
final int length = Array.getLength(o);
// construct a string of form value1;value2;...
final StringBuilder buffer = new StringBuilder();
for (int i = 0; i < length; i++) {
buffer.append((String) getterMethod.invoke(Array.get(o, i)));
if (i < (length - 1)) {
buffer.append(';');
}
}
writer.setValue(buffer.toString());
} catch (Exception e) {
throw new ConversionException(
String.format("Exception writing pick list value %s of type %s: %s",
o, o.getClass().getName(), e.getMessage()), e);
}
}
@Override
public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
final String listValue = reader.getValue();
// get Picklist enum element class from array class
final Class<?> requiredArrayType = context.getRequiredType();
final Class<?> requiredType = requiredArrayType.getComponentType();
try {
Method factoryMethod = requiredType.getMethod(FACTORY_METHOD, String.class);
// parse the string of the form value1;value2;...
final String[] value = listValue.split(";");
final int length = value.length;
final Object resultArray = Array.newInstance(requiredType, length);
for (int i = 0; i < length; i++) {
// use factory method to create object
Array.set(resultArray, i, factoryMethod.invoke(null, value[i].trim()));
}
return resultArray;
} catch (Exception e) {
throw new ConversionException(
String.format("Exception reading pick list value %s of type %s: %s",
listValue, requiredArrayType.getName(), e.getMessage()), e);
}
}
@Override
@SuppressWarnings("unchecked")
public boolean canConvert(Class aClass) {
try {
// check whether the Class is an array, and whether the array elment is a Picklist enum class
final Class componentType = aClass.getComponentType();
return componentType != null && Enum.class.isAssignableFrom(componentType)
&& componentType.getMethod(FACTORY_METHOD, String.class) != null;
} catch (NoSuchMethodException e) {
return false;
}
}
}