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Java example source code file (ServletsModuleBuilder.java)

This example Java source code file (ServletsModuleBuilder.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

arraylist, binder, hashmap, http, httpservlet, illegalargumentexception, list, map, more, request, response, servlet, servletdefinition, servletkeybindingbuilderimpl, servletsmodulebuilder, set, string, uripatternmatcher, util

The ServletsModuleBuilder.java Java example source code

/**
 * Copyright (C) 2008 Google Inc.
 *
 * 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 com.google.inject.servlet;

import com.google.common.collect.Sets;
import com.google.inject.Binder;
import com.google.inject.Key;
import com.google.inject.internal.UniqueAnnotations;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import javax.servlet.http.HttpServlet;

/**
 * Builds the guice module that binds configured servlets, with their
 * wrapper ServletDefinitions. Is part of the binding EDSL. Very similar to
 * {@link com.google.inject.servlet.FiltersModuleBuilder}.
 *
 * @author Dhanji R. Prasanna (dhanji@gmail.com)
 */
class ServletsModuleBuilder {
  
  private final Set<String> servletUris = Sets.newHashSet();
  private final Binder binder;
  
  public ServletsModuleBuilder(Binder binder) {
    this.binder = binder;
  }

  //the first level of the EDSL--
  public ServletModule.ServletKeyBindingBuilder serve(List<String> urlPatterns) {
    return new ServletKeyBindingBuilderImpl(parsePatterns(UriPatternType.SERVLET, urlPatterns));
  }

  public ServletModule.ServletKeyBindingBuilder serveRegex(List<String> regexes) {
    return new ServletKeyBindingBuilderImpl(parsePatterns(UriPatternType.REGEX, regexes));
  }

  private List<UriPatternMatcher> parsePatterns(UriPatternType type, List patterns) {
    List<UriPatternMatcher> patternMatchers = new ArrayList();
    for (String pattern : patterns) {
      if (!servletUris.add(pattern)) {
        binder
            .skipSources(ServletModule.class, ServletsModuleBuilder.class)
            .addError("More than one servlet was mapped to the same URI pattern: " + pattern);
      } else {
        UriPatternMatcher matcher = null;
        try {
          matcher = UriPatternType.get(type, pattern);
        } catch (IllegalArgumentException iae) {
          binder
              .skipSources(ServletModule.class, ServletsModuleBuilder.class)
              .addError("%s", iae.getMessage());
        }
        if (matcher != null) {
          patternMatchers.add(matcher);
        }
      }
    }
    return patternMatchers;
  }

  //non-static inner class so it can access state of enclosing module class
  class ServletKeyBindingBuilderImpl implements ServletModule.ServletKeyBindingBuilder {
    private final List<UriPatternMatcher> uriPatterns;

    private ServletKeyBindingBuilderImpl(List<UriPatternMatcher> uriPatterns) {
      this.uriPatterns = uriPatterns;
    }

    public void with(Class<? extends HttpServlet> servletKey) {
      with(Key.get(servletKey));
    }

    public void with(Key<? extends HttpServlet> servletKey) {
      with(servletKey, new HashMap<String, String>());
    }

    public void with(HttpServlet servlet) {
      with(servlet, new HashMap<String, String>());
    }

    public void with(Class<? extends HttpServlet> servletKey,
        Map<String, String> initParams) {
      with(Key.get(servletKey), initParams);
    }

    public void with(Key<? extends HttpServlet> servletKey,
        Map<String, String> initParams) {
      with(servletKey, initParams, null);
    }

    private void with(Key<? extends HttpServlet> servletKey, Map initParams,
        HttpServlet servletInstance) {
      for (UriPatternMatcher pattern : uriPatterns) {
        binder
            .bind(Key.get(ServletDefinition.class, UniqueAnnotations.create()))
            .toProvider(new ServletDefinition(servletKey, pattern, initParams, servletInstance));
      }
    }

    public void with(HttpServlet servlet,
        Map<String, String> initParams) {
      Key<HttpServlet> servletKey = Key.get(HttpServlet.class, UniqueAnnotations.create());
      binder.bind(servletKey).toInstance(servlet);
      with(servletKey, initParams, servlet);
    }
  }
}

Other Java examples (source code examples)

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