package com.atlassian.plugins.rest.common.expand.resolver;
   
   import com.atlassian.plugins.rest.common.expand.EntityExpander;
   
   import static com.google.common.base.Preconditions.checkNotNull;
   
   import java.util.List;
   
   public class ChainingEntityExpanderResolver implements EntityExpanderResolver {
      private final List<EntityExpanderResolver> resolvers;
  
      public ChainingEntityExpanderResolver(List<EntityExpanderResolver> resolvers) {
          for (EntityExpanderResolver resolver : checkNotNull(resolvers)) {
              if (resolver == null) {
                  throw new NullPointerException("Resolver items cannot be null!");
              }
          }
          this.resolvers = resolvers;
      }
  
      public boolean hasExpander(Class<?> type) {
          checkNotNull(type);
          for (EntityExpanderResolver resolver : resolvers) {
              if (resolver.hasExpander(type)) {
                  return true;
              }
          }
          return false;
      }
  
      public <T> EntityExpander<T> getExpander(Class<? extends T> type) {
          for (EntityExpanderResolver resolver : resolvers) {
              final EntityExpander<T> expander = resolver.getExpander(type);
              if (expander != null) {
                  return expander;
              }
          }
          return null;
      }
  }