common/src/main/java/org/apache/falcon/entity/parser/EntityParserFactory.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.falcon.entity.parser;

import org.apache.falcon.entity.v0.EntityType;

/**
 * Factory Class which returns the Parser based on the EntityType.
 */
public final class EntityParserFactory {

    private EntityParserFactory() {
    }

    /**
     * Tie EnityType with the Entity Class in one place so that it can be
     * unmarshalled easily by concrete classes based on the class type using
     * JAXB.
     *
     * @param entityType - entity type
     * @return concrete parser based on entity type
     */
    public static EntityParser getParser(final EntityType entityType) {

        switch (entityType) {
        case PROCESS:
            return new ProcessEntityParser();
        case FEED:
            return new FeedEntityParser();
        case CLUSTER:
            return new ClusterEntityParser();
        case DATASOURCE:
            return new DatasourceEntityParser();
        default:
            throw new IllegalArgumentException("Unhandled entity type: " + entityType);
        }
    }

}