| /** |
| * 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.AbstractModule; |
| import com.google.inject.Key; |
| import com.google.inject.internal.util.Lists; |
| import com.google.inject.internal.UniqueAnnotations; |
| 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 extends AbstractModule { |
| private final List<FilterDefinition> filterDefinitions = Lists.newArrayList(); |
| private final List<FilterInstanceBindingEntry> filterInstanceEntries = Lists.newArrayList(); |
| |
| //invoked on injector config |
| @Override |
| protected void configure() { |
| // Create bindings for filter instances |
| for (FilterInstanceBindingEntry entry : filterInstanceEntries) { |
| bind(entry.key).toInstance(entry.filter); |
| } |
| |
| // Bind these filter definitions to a unique random key. Doesn't matter what it is, |
| // coz it's never used. |
| for(FilterDefinition fd : filterDefinitions) { |
| bind(FilterDefinition.class).annotatedWith(UniqueAnnotations.create()).toProvider(fd); |
| } |
| } |
| |
| public ServletModule.FilterKeyBindingBuilder filter(List<String> patterns) { |
| return new FilterKeyBindingBuilderImpl(patterns, UriPatternType.SERVLET); |
| } |
| |
| public ServletModule.FilterKeyBindingBuilder filterRegex(List<String> regexes) { |
| return new FilterKeyBindingBuilderImpl(regexes, UriPatternType.REGEX); |
| } |
| |
| private static class FilterInstanceBindingEntry { |
| final Key<Filter> key; |
| final Filter filter; |
| |
| FilterInstanceBindingEntry(Key<Filter> key, Filter filter) { |
| this.key = key; |
| this.filter = filter; |
| } |
| } |
| |
| //non-static inner class so it can access state of enclosing module class |
| class FilterKeyBindingBuilderImpl implements ServletModule.FilterKeyBindingBuilder { |
| private final List<String> uriPatterns; |
| private final UriPatternType uriPatternType; |
| |
| private FilterKeyBindingBuilderImpl(List<String> uriPatterns, UriPatternType uriPatternType) { |
| this.uriPatterns = uriPatterns; |
| this.uriPatternType = uriPatternType; |
| } |
| |
| 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 (String pattern : uriPatterns) { |
| filterDefinitions.add( |
| new FilterDefinition(pattern, filterKey, UriPatternType.get(uriPatternType, pattern), |
| initParams, filterInstance)); |
| } |
| } |
| |
| public void through(Filter filter, |
| Map<String, String> initParams) { |
| Key<Filter> filterKey = Key.get(Filter.class, UniqueAnnotations.create()); |
| filterInstanceEntries.add(new FilterInstanceBindingEntry(filterKey, filter)); |
| through(filterKey, initParams, filter); |
| } |
| } |
| } |