/*
* 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
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*/
package org.apache.brooklyn.util.core.xstream;
import java.util.Collection;
import com.google.common.base.Predicates;
import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Iterables;
import com.google.common.collect.Lists;
import com.thoughtworks.xstream.converters.UnmarshallingContext;
import com.thoughtworks.xstream.converters.collections.CollectionConverter;
import com.thoughtworks.xstream.io.HierarchicalStreamReader;
import com.thoughtworks.xstream.mapper.Mapper;
public class ImmutableSetConverter extends CollectionConverter {
public ImmutableSetConverter(Mapper mapper) {
super(mapper);
}
@Override
public boolean canConvert(@SuppressWarnings("rawtypes") Class type) {
return ImmutableSet.class.isAssignableFrom(type);
}
// marshalling is the same
// so is unmarshalling the entries
// only differences are creating the overarching collection, which we do after the fact
// (optimizing format on disk as opposed to in-memory), and we discard null values
// to avoid failing entirely.
public Object unmarshal(HierarchicalStreamReader reader, UnmarshallingContext context) {
Collection<?> collection = Lists.newArrayList();
populateCollection(reader, context, collection);
return ImmutableSet.copyOf(Iterables.filter(collection, Predicates.notNull()));
}
}