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Java example source code file (FiltersModuleBuilder.java)

This example Java source code file (FiltersModuleBuilder.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, filter, filterdefinition, filterkeybindingbuilderimpl, filtersmodulebuilder, hashmap, illegalargumentexception, list, map, servlet, string, uripatternmatcher, util

The FiltersModuleBuilder.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.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 javax.servlet.Filter;

/**
 * Builds the guice module that binds configured filters, with their
 * wrapper FilterDefinitions. Is part of the binding EDSL. All Filters
 * and Servlets are always bound as singletons.
 *
 * @author dhanji@gmail.com (Dhanji R. Prasanna)
 */
class FiltersModuleBuilder {
  
  private final Binder binder;
  
  public FiltersModuleBuilder(Binder binder) {
    this.binder = binder;
  }

  public ServletModule.FilterKeyBindingBuilder filter(List<String> patterns) {
    return new FilterKeyBindingBuilderImpl(parsePatterns(UriPatternType.SERVLET, patterns));
  }

  public ServletModule.FilterKeyBindingBuilder filterRegex(List<String> regexes) {
    return new FilterKeyBindingBuilderImpl(parsePatterns(UriPatternType.REGEX, regexes));
  }

  private List<UriPatternMatcher> parsePatterns(UriPatternType type, List patterns) {
    List<UriPatternMatcher> patternMatchers = new ArrayList();
    for (String pattern : patterns) {
      UriPatternMatcher matcher = null;
      try {
        matcher = UriPatternType.get(type, pattern);
      } catch (IllegalArgumentException iae) {
        binder
            .skipSources(ServletModule.class, FiltersModuleBuilder.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 FilterKeyBindingBuilderImpl implements ServletModule.FilterKeyBindingBuilder {
    private final List<UriPatternMatcher> uriPatterns;

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

    public void through(Class<? extends Filter> filterKey) {
      through(Key.get(filterKey));
    }

    public void through(Key<? extends Filter> filterKey) {
      through(filterKey, new HashMap<String, String>());
    }

    public void through(Filter filter) {
      through(filter, new HashMap<String, String>());
    }

    public void through(Class<? extends Filter> filterKey,
        Map<String, String> initParams) {
      
      // Careful you don't accidentally make this method recursive, thank you IntelliJ IDEA!
      through(Key.get(filterKey), initParams);
    }

    public void through(Key<? extends Filter> filterKey,
        Map<String, String> initParams) {
      through(filterKey, initParams, null);
    }
    
    private void through(Key<? extends Filter> filterKey,
        Map<String, String> initParams,
        Filter filterInstance) {
      for (UriPatternMatcher pattern : uriPatterns) {
        binder
            .bind(FilterDefinition.class)
            .annotatedWith(UniqueAnnotations.create())
            .toProvider(new FilterDefinition(filterKey, pattern, initParams, filterInstance));
      }
    }

    public void through(Filter filter,
        Map<String, String> initParams) {
      Key<Filter> filterKey = Key.get(Filter.class, UniqueAnnotations.create());
      binder.bind(filterKey).toInstance(filter);
      through(filterKey, initParams, filter);
    }
  }
}

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