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Java example source code file (FilterPipelineTest.java)

This example Java source code file (FilterPipelineTest.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

filterchain, filterconfig, guicefilter, http, ioexception, neverfilter, override, request, response, servlet, servletcontext, servletexception, servletmodule, servletresponse, singleton, testcase, testfilter, this

The FilterPipelineTest.java Java example source code

package com.google.inject.servlet;

import static org.easymock.EasyMock.createMock;
import static org.easymock.EasyMock.expect;
import static org.easymock.EasyMock.expectLastCall;
import static org.easymock.EasyMock.isA;
import static org.easymock.EasyMock.isNull;
import static org.easymock.EasyMock.replay;
import static org.easymock.EasyMock.verify;

import com.google.inject.Guice;
import com.google.inject.Key;
import com.google.inject.Singleton;

import junit.framework.TestCase;

import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;

/**
 * This is a basic whitebox test that verifies the glue between
 * GuiceFilter and ManagedFilterPipeline is working.
 * 
 * @author dhanji@gmail.com (Dhanji R. Prasanna)
 */
public class FilterPipelineTest extends TestCase {

  @Override
  public final void setUp() {
    GuiceFilter.reset();
    
    Guice.createInjector(new ServletModule() {

      @Override
      protected void configureServlets() {
          filter("/*").through(TestFilter.class);
          filter("*.html").through(TestFilter.class);
          filter("/*").through(Key.get(TestFilter.class));
          filter("*.jsp").through(Key.get(TestFilter.class));

          // These filters should never fire
          filter("/index/*").through(Key.get(NeverFilter.class));
          filter("/public/login/*").through(Key.get(NeverFilter.class));
      }
    });
  }

  @Override
  public final void tearDown() {
    GuiceFilter.reset();
  }

  public final void testDispatchThruGuiceFilter() throws ServletException, IOException {

    //create mocks
    FilterConfig filterConfig = createMock(FilterConfig.class);
    ServletContext servletContext = createMock(ServletContext.class);
    HttpServletRequest request = createMock(HttpServletRequest.class);
    FilterChain proceedingFilterChain = createMock(FilterChain.class);

    //begin mock script ***

    expect(filterConfig.getServletContext())
        .andReturn(servletContext)
        .once();

    expect(request.getRequestURI())
        .andReturn("/public/login.jsp")
        .anyTimes();
    expect(request.getContextPath())
        .andReturn("")
        .anyTimes();

    //at the end, proceed down webapp's normal filter chain
    proceedingFilterChain.doFilter(isA(HttpServletRequest.class), (ServletResponse) isNull());
    expectLastCall().once();

    //run mock script ***
    replay(filterConfig, servletContext, request, proceedingFilterChain);

    final GuiceFilter webFilter = new GuiceFilter();

    webFilter.init(filterConfig);
    webFilter.doFilter(request, null, proceedingFilterChain);
    webFilter.destroy();

    //assert expectations
    verify(filterConfig, servletContext, request, proceedingFilterChain);
  }

  @Singleton
  public static class TestFilter implements Filter {
    public void init(FilterConfig filterConfig) {
    }

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
        FilterChain filterChain) throws IOException, ServletException {
      filterChain.doFilter(servletRequest, servletResponse);
    }

    public void destroy() {
    }
  }

  @Singleton
  public static class NeverFilter implements Filter {
    public void init(FilterConfig filterConfig) {
    }

    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
        FilterChain filterChain) {
      fail("This filter should never have fired");
    }

    public void destroy() {
    }
  }
}

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