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MessagePack for Java is a binary-based efficient object serialization library in Java.

There is a newer version: 0.6.12

//
// 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.Collection;
import java.util.LinkedList;
import org.msgpack.packer.Packer;
import org.msgpack.unpacker.Unpacker;
import org.msgpack.MessageTypeException;


public class CollectionTemplate extends AbstractTemplate> {
    private Template elementTemplate;

    public CollectionTemplate(Template elementTemplate) {
        this.elementTemplate = elementTemplate;
    }

    public void write(Packer pk, Collection target, boolean required) throws IOException {
        if (target == null) {
            if (required) {
                throw new MessageTypeException("Attempted to write null");
            }
            pk.writeNil();
            return;
        }
        Collection col = target;
        pk.writeArrayBegin(col.size());
        for (E e : col) {
            elementTemplate.write(pk, e);
        }
        pk.writeArrayEnd();
    }

    public Collection read(Unpacker u, Collection to, boolean required) throws IOException {
        if (!required && u.trySkipNil()) {
            return null;
        }
        int n = u.readArrayBegin();
        if (to == null) {
            to = new LinkedList();
        } else {
            to.clear();
        }
        for (int i= 0; i < n; i++) {
            E e = elementTemplate.read(u, null);
            to.add(e);
        }
        u.readArrayEnd();
        return to;
    }
}