/*
    * Copyright (C) 2007 the original author or authors.
    *
    * 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.codehaus.plexus.metadata.gleaner;
  
  import java.util.Collection;
  import java.util.Map;
  
  import org.codehaus.plexus.component.repository.ComponentDescriptor;
  import org.codehaus.plexus.configuration.PlexusConfiguration;
  import org.codehaus.plexus.configuration.xml.XmlPlexusConfiguration;
  
  /**
   * Support for component gleaner implementations.
   *
   */
  public abstract class ComponentGleanerSupport {
      private static final String EMPTY_STRING = "";
  
      protected String filterEmptyAsNull(final String value) {
          if (value == null) {
              return null;
          } else if (EMPTY_STRING.equals(value.trim())) {
              return null;
          } else {
              return value;
          }
      }
  
      protected boolean isRequirementListType(final Class<?> type) {
          // assert type != null;
  
          return Collection.class.isAssignableFrom(type) || Map.class.isAssignableFrom(type);
      }
  
      protected void addChildConfiguration(final ComponentDescriptor<?> component, final PlexusConfiguration config) {
          // assert component != null;
          // assert config != null;
  
          if (!component.hasConfiguration()) {
              component.setConfiguration(new XmlPlexusConfiguration("configuration"));
          }
  
          component.getConfiguration().addChild(config);
      }
  
      protected String deHump(final String string) {
          // assert string != null;
  
          StringBuilder buff = new StringBuilder();
  
          for (int i = 0; i < string.length(); i++) {
              if (i != 0 && Character.isUpperCase(string.charAt(i))) {
                  buff.append('-');
              }
  
              buff.append(string.charAt(i));
          }
  
          return buff.toString().trim().toLowerCase();
      }
  }