org.ros.internal.message.DefaultMessageInterfaceClassProvider.java Source code

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Here is the source code for org.ros.internal.message.DefaultMessageInterfaceClassProvider.java

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/*
 * Copyright (C) 2011 Google Inc.
 *
 * 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.ros.internal.message;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.collect.Maps;

import java.util.Map;

/**
 * @author damonkohler@google.com (Damon Kohler)
 */
public class DefaultMessageInterfaceClassProvider implements MessageInterfaceClassProvider {

    private final Map<String, Class<?>> cache;

    public DefaultMessageInterfaceClassProvider() {
        cache = Maps.newConcurrentMap();
    }

    @SuppressWarnings("unchecked")
    @Override
    public <T> Class<T> get(String messageType) {
        if (cache.containsKey(messageType)) {
            return (Class<T>) cache.get(messageType);
        }
        try {
            String className = messageType.replace("/", ".");
            Class<T> messageInterfaceClass = (Class<T>) getClass().getClassLoader().loadClass(className);
            cache.put(messageType, messageInterfaceClass);
            return messageInterfaceClass;
        } catch (ClassNotFoundException e) {
            return (Class<T>) RawMessage.class;
        }
    }

    @VisibleForTesting
    <T> void add(String messageType, Class<T> messageInterfaceClass) {
        cache.put(messageType, messageInterfaceClass);
    }
}