package com.atlassian.plugins.rest.module.util;
   
   import com.sun.jersey.core.reflection.AnnotatedMethod;
   import net.sf.cglib.proxy.InvocationHandler;
   
   import javax.ws.rs.Path;
   import javax.ws.rs.PathParam;
   import javax.ws.rs.core.UriBuilder;
   import java.lang.annotation.Annotation;
  import java.lang.reflect.Method;
  import java.net.URI;
  import java.util.HashMap;
  import java.util.Map;
  
  /**
   * Base class used for creating dummy REST resource responses.
   */
  public abstract class ResourceInvokable implements InvocationHandler {
      protected Class<?> resourceClass;
      private final URI baseUri;
  
      public ResourceInvokable(final Class<?> resourceClass, final URI baseUri) {
          this.resourceClass = resourceClass;
          this.baseUri = baseUri;
      }
  
      protected Map<String, Object> buildParamMap(final AnnotatedMethod called, final Object[] args) {
          Map<String, Object> rv = new HashMap<String, Object>();
  
          Annotation[][] allParameterAnnotations = called.getParameterAnnotations();
  
          for (int i = 0; i < allParameterAnnotations.length; i++) {
              Annotation[] parameterAnnotations = allParameterAnnotations[i];
  
              for (Annotation annotation : parameterAnnotations) {
                  if (annotation instanceof PathParam && args[i] != null) {
                      rv.put(((PathParam) annotation).value(), args[i]);
                  }
              }
          }
  
          return rv;
      }
  
      protected URI getURI(final Method method, final Object[] args) {
          final UriBuilder builder = UriBuilder.fromUri(baseUri).path(resourceClass);
          if (new AnnotatedMethod(method).getAnnotation(Path.class) != null) {
              builder.path(method);
          }
          return builder.buildFromMap(buildParamMap(new AnnotatedMethod(method), args));
      }
  
  }