/*
* 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.Lists;
import com.google.inject.Binding;
import com.google.inject.Inject;
import com.google.inject.Injector;
import com.google.inject.Provider;
import com.google.inject.Singleton;
import com.google.inject.TypeLiteral;
import java.util.List;
import javax.servlet.ServletContext;
/**
* Managed implementation of a central routing/dispatch class which handles lifecycle of managed
* filters, and delegates to a managed servlet pipeline.
*
* @author dhanji@gmail.com (Dhanji R. Prasanna)
*/
@Singleton
class ManagedFilterPipeline extends AbstractFilterPipeline {
private final FilterDefinition[] filterDefinitions;
private static final TypeLiteral<FilterDefinition> FILTER_DEFS =
TypeLiteral.get(FilterDefinition.class);
@Inject
public ManagedFilterPipeline(
Injector injector,
ManagedServletPipeline servletPipeline,
Provider<ServletContext> servletContext) {
super(injector, servletPipeline, servletContext);
this.filterDefinitions = collectFilterDefinitions(injector);
}
@Override
protected boolean hasFiltersMapped() {
return filterDefinitions.length > 0;
}
@Override
protected FilterDefinition[] filterDefinitions() {
return filterDefinitions;
}
/**
* Introspects the injector and collects all instances of bound {@code List<FilterDefinition>}
* into a master list.
*
* <p>We have a guarantee that {@link com.google.inject.Injector#getBindings()} returns a map that
* preserves insertion order in entry-set iterators.
*/
private FilterDefinition[] collectFilterDefinitions(Injector injector) {
List<FilterDefinition> filterDefinitions = Lists.newArrayList();
for (Binding<FilterDefinition> entry : injector.findBindingsByType(FILTER_DEFS)) {
filterDefinitions.add(entry.getProvider().get());
}
// Copy to a fixed-size array for speed of iteration.
return filterDefinitions.toArray(new FilterDefinition[filterDefinitions.size()]);
}
}