JAXBContextResolver.java

/**
 * 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 under the License.
 */

package org.apache.zookeeper.server.jersey.resources;

import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;

import javax.ws.rs.ext.ContextResolver;
import javax.ws.rs.ext.Provider;
import javax.xml.bind.JAXBContext;

import org.apache.zookeeper.server.jersey.jaxb.ZChildrenJSON;
import org.apache.zookeeper.server.jersey.jaxb.ZPath;
import org.apache.zookeeper.server.jersey.jaxb.ZStat;

import com.sun.jersey.api.json.JSONConfiguration;
import com.sun.jersey.api.json.JSONJAXBContext;

/**
 * Tell Jersey how to resolve JSON formatting. Specifically detail the
 * fields which are arrays and which are numbers (not strings).
 */
@Provider
@SuppressWarnings("unchecked")
public final class JAXBContextResolver implements ContextResolver<JAXBContext> {
    private final JAXBContext context;

    private final Set<Class> typesSet;

    public JAXBContextResolver() throws Exception {
        Class[] typesArr =
            new Class[]{ZPath.class, ZStat.class, ZChildrenJSON.class};
        typesSet = new HashSet<Class>(Arrays.asList(typesArr));
        context = new JSONJAXBContext(
                JSONConfiguration.mapped()
                    .arrays("children")
                    .nonStrings("czxid")
                    .nonStrings("mzxid")
                    .nonStrings("ctime")
                    .nonStrings("mtime")
                    .nonStrings("version")
                    .nonStrings("cversion")
                    .nonStrings("aversion")
                    .nonStrings("ephemeralOwner")
                    .nonStrings("dataLength")
                    .nonStrings("numChildren")
                    .nonStrings("pzxid")
                    .build(),
                typesArr);
    }

    public JAXBContext getContext(Class<?> objectType) {
        return (typesSet.contains(objectType)) ? context : null;
    }
}