001/**
002 * Licensed to the Apache Software Foundation (ASF) under one or more
003 * contributor license agreements.  See the NOTICE file distributed with
004 * this work for additional information regarding copyright ownership.
005 * The ASF licenses this file to You under the Apache License, Version 2.0
006 * (the "License"); you may not use this file except in compliance with
007 * the License.  You may obtain a copy of the License at
008 *
009 *      http://www.apache.org/licenses/LICENSE-2.0
010 *
011 * Unless required by applicable law or agreed to in writing, software
012 * distributed under the License is distributed on an "AS IS" BASIS,
013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014 * See the License for the specific language governing permissions and
015 * limitations under the License.
016 */
017package org.apache.camel.component.bean;
018
019import org.apache.camel.CamelContext;
020import org.apache.camel.Processor;
021import org.apache.camel.util.ObjectHelper;
022
023/**
024 * A constant (singleton) bean implementation of {@link org.apache.camel.component.bean.BeanTypeHolder}
025 *
026 * @version
027 */
028public class ConstantTypeBeanHolder implements BeanTypeHolder {
029    private final Class<?> type;
030    private final BeanInfo beanInfo;
031
032    public ConstantTypeBeanHolder(Class<?> type, BeanInfo beanInfo) {
033        ObjectHelper.notNull(type, "type");
034        ObjectHelper.notNull(beanInfo, "beanInfo");
035
036        this.type = type;
037        this.beanInfo = beanInfo;
038    }
039
040    public ConstantTypeBeanHolder(Class<?> type, CamelContext context) {
041        this(type, new BeanInfo(context, type));
042    }
043
044    public ConstantTypeBeanHolder(Class<?> type, CamelContext context, ParameterMappingStrategy parameterMappingStrategy) {
045        this(type, new BeanInfo(context, type, parameterMappingStrategy));
046    }
047
048    /**
049     * Creates a cached and constant {@link org.apache.camel.component.bean.BeanHolder} from this holder.
050     *
051     * @return a new {@link org.apache.camel.component.bean.BeanHolder} that has cached the lookup of the bean.
052     */
053    public ConstantBeanHolder createCacheHolder() throws Exception {
054        Object bean = getBean();
055        return new ConstantBeanHolder(bean, beanInfo);
056    }
057
058    @Override
059    public String toString() {
060        return type.toString();
061    }
062
063    public Object getBean()  {
064        // only create a bean if we have constructors
065        if (beanInfo.hasPublicConstructors()) {
066            return getBeanInfo().getCamelContext().getInjector().newInstance(type);
067        } else {
068            return null;
069        }
070    }
071
072    public Processor getProcessor() {
073        return null;
074    }
075
076    public boolean supportProcessor() {
077        return false;
078    }
079
080    public BeanInfo getBeanInfo() {
081        return beanInfo;
082    }
083
084    public BeanInfo getBeanInfo(Object bean) {
085        return null;
086    }
087
088    public Class<?> getType() {
089        return type;
090    }
091
092}