trunk/camel-core/src/main/java/org/apache/camel/impl/converter/CachingInjector.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.camel.impl.converter;

import org.apache.camel.spi.TypeConverterRegistry;

/**
 * A caching proxy
 *
 * @version 
 */
public class CachingInjector<T> {
    private final TypeConverterRegistry repository;
    private final Class<T> type;
    private T instance;

    public CachingInjector(TypeConverterRegistry repository, Class<T> type) {
        this.repository = repository;
        this.type = type;
    }

    public synchronized T newInstance() {
        if (instance == null) {
            instance = createInstance(type);
        }
        return instance;
    }

    protected T createInstance(Class<T> t) {
        return repository.getInjector().newInstance(t);
    }
}