//
// MessagePack for Java
//
// Copyright (C) 2009-2011 FURUHASHI Sadayuki
//
// 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://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.msgpack.template;
import java.io.IOException;
import java.util.Map;
import java.util.HashMap;
import org.msgpack.packer.Packer;
import org.msgpack.unpacker.Unpacker;
import org.msgpack.MessageTypeException;
public class MapTemplate<K,V> extends AbstractTemplate<Map<K,V>> {
private Template<K> keyTemplate;
private Template<V> valueTemplate;
public MapTemplate(Template<K> keyTemplate, Template<V> valueTemplate) {
this.keyTemplate = keyTemplate;
this.valueTemplate = valueTemplate;
}
public void write(Packer pk, Map<K,V> target, boolean required) throws IOException {
if (!(target instanceof Map)) {
if (target == null) {
if (required) {
throw new MessageTypeException("Attempted to write null");
}
pk.writeNil();
return;
}
throw new MessageTypeException("Target is not a Map but "+target.getClass());
}
Map<K,V> map = (Map<K,V>) target;
pk.writeMapBegin(map.size());
for (Map.Entry<K,V> pair : map.entrySet()) {
keyTemplate.write(pk, pair.getKey());
valueTemplate.write(pk, pair.getValue());
}
pk.writeMapEnd();
}
public Map<K,V> read(Unpacker u, Map<K,V> to, boolean required) throws IOException {
if (!required && u.trySkipNil()) {
return null;
}
int n = u.readMapBegin();
Map<K,V> map;
if (to != null) {
map = (Map<K,V>) to;
map.clear();
} else {
map = new HashMap<K,V>(n);
}
for (int i = 0; i < n; i++) {
K key = keyTemplate.read(u, null);
V value = valueTemplate.read(u, null);
map.put(key, value);
}
u.readMapEnd();
return map;
}
}