//
// 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.List;
import java.util.ArrayList;
import org.msgpack.packer.Packer;
import org.msgpack.unpacker.Unpacker;
import org.msgpack.MessageTypeException;
public class ListTemplate<E> extends AbstractTemplate<List<E>> {
private Template<E> elementTemplate;
public ListTemplate(Template<E> elementTemplate) {
this.elementTemplate = elementTemplate;
}
public void write(Packer pk, List<E> target, boolean required) throws IOException {
if (! (target instanceof List)) {
if (target == null) {
if (required) {
throw new MessageTypeException("Attempted to write null");
}
pk.writeNil();
return;
}
throw new MessageTypeException("Target is not a List but " + target.getClass());
}
pk.writeArrayBegin(target.size());
for (E e : target) {
elementTemplate.write(pk, e);
}
pk.writeArrayEnd();
}
public List<E> read(Unpacker u, List<E> to, boolean required) throws IOException {
if (!required && u.trySkipNil()) {
return null;
}
int n = u.readArrayBegin();
if (to == null) {
to = new ArrayList<E>(n);
} else {
to.clear();
}
for (int i = 0; i < n; i++) {
E e = elementTemplate.read(u, null);
to.add(e);
}
u.readArrayEnd();
return to;
}
}