/*
* Copyright 2014-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Licensed 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://aws.amazon.com/apache2.0
*
* This file 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 com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.marshallers;
import com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.ArgumentMarshaller;
import com.amazonaws.mobileconnectors.dynamodbv2.dynamodbmapper.ArgumentMarshaller.ListAttributeMarshaller;
import com.amazonaws.services.dynamodbv2.model.AttributeValue;
import java.util.ArrayList;
import java.util.List;
public class ListToListMarshaller implements ListAttributeMarshaller {
private static final ListToListMarshaller INSTANCE =
new ListToListMarshaller();
public static ListToListMarshaller instance() {
return INSTANCE;
}
private final ArgumentMarshaller memberMarshaller;
private ListToListMarshaller() {
this(null);
}
public ListToListMarshaller(ArgumentMarshaller memberMarshaller) {
this.memberMarshaller = memberMarshaller;
}
@Override
public AttributeValue marshall(Object obj) {
if (memberMarshaller == null) {
throw new IllegalStateException(
"No member marshaller configured!");
}
List<?> objects = (List<?>) obj;
List<AttributeValue> values =
new ArrayList<AttributeValue>(objects.size());
for (Object o : objects) {
AttributeValue value;
if (o == null) {
value = new AttributeValue().withNULL(true);
} else {
value = memberMarshaller.marshall(o);
}
values.add(value);
}
AttributeValue result = new AttributeValue();
result.setL(values);
return result;
}
public ArgumentMarshaller getMemberMarshaller() {
return memberMarshaller;
}
}