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   *   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
   *
   *    https://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
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   *  specific language governing permissions and limitations
   *  under the License.
   ****************************************************************/
  package org.apache.cayenne.configuration;
  
  import org.apache.cayenne.map.DataMap;
  import org.apache.cayenne.resource.Resource;
  
  /**
   * @since 3.1
   */
  public class DefaultConfigurationNameMapper implements ConfigurationNameMapper {
  
  	private static final String DEFAULT_NAME = "cayenne";
  	private static final String CAYENNE_PREFIX = "cayenne-";
  	private static final String CAYENNE_SUFFIX = ".xml";
  
  	private static final String DATA_MAP_SUFFIX = ".map.xml";
  
  	protected ConfigurationNodeVisitor<String> nameMapper;
  
  	public DefaultConfigurationNameMapper() {
  		nameMapper = new NameMapper();
  	}
  
  	@Override
  	public String configurationLocation(ConfigurationNode node) {
  		return node.acceptVisitor(nameMapper);
  	}
  
  	@Override
  	public String configurationLocation(Class<? extends ConfigurationNode> type, String name) {
  		if (DataChannelDescriptor.class.isAssignableFrom(type)) {
  			return getDataChannelName(name);
  		} else if (DataMap.class.isAssignableFrom(type)) {
  			return getDataMapName(name);
  		}
  
  		throw new IllegalArgumentException("Unrecognized configuration type: " + type.getName());
  	}
  
  	@Override
  	public String configurationNodeName(Class<? extends ConfigurationNode> type, Resource resource) {
  
  		String path = resource.getURL().getPath();
  		if (path == null || path.length() == 0) {
  			return null;
  		}
  
  		int lastSlash = path.lastIndexOf('/');
  		if (lastSlash >= 0) {
  
  			if (lastSlash == path.length() - 1) {
  				return null;
  			}
  
  			path = path.substring(lastSlash + 1);
  
  		}
  
  		if (DataChannelDescriptor.class.isAssignableFrom(type)) {
  			if (!path.startsWith(CAYENNE_PREFIX) || !path.endsWith(CAYENNE_SUFFIX)) {
  				// DataChannelDescriptor should always have name
  				return DEFAULT_NAME;
  			}
  
  			return path.substring(CAYENNE_PREFIX.length(), path.length() - CAYENNE_SUFFIX.length());
  		} else if (DataMap.class.isAssignableFrom(type)) {
  			if (!path.endsWith(DATA_MAP_SUFFIX)) {
  				return null;
  			}
  			return path.substring(0, path.length() - DATA_MAP_SUFFIX.length());
  		}
  
  		throw new IllegalArgumentException("Unrecognized configuration type: " + type.getName());
  	}
  
  	protected String getDataChannelName(String name) {
  		if (name == null) {
  			throw new NullPointerException("Null DataChannelDescriptor name");
  		}
  
  		return CAYENNE_PREFIX + name + CAYENNE_SUFFIX;
  	}
  
  	protected String getDataMapName(String name) {
  		if (name == null) {
  			throw new NullPointerException("Null DataMap name");
  		}
  
  		return name + DATA_MAP_SUFFIX;
  	}
  
  	final class NameMapper extends BaseConfigurationNodeVisitor<String> {
  
  		@Override
  		public String visitDataChannelDescriptor(DataChannelDescriptor descriptor) {
  			return getDataChannelName(descriptor.getName());
  		}
  
  		@Override
  		public String visitDataMap(DataMap dataMap) {
  			return getDataMapName(dataMap.getName());
  		}
  	}
  }
  