/*
* Copyright 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.gwt.dev.resource;
import java.util.Map;
import java.util.Set;
/**
* An abstraction for finding and retrieving {@link Resource}s by abstract path
* name. Intuitively, it works like a jar in that each URL is uniquely located
* somewhere in an abstract namespace. The abstract names must be constructed
* from a series of zero or more valid Java identifiers followed by the '/'
* character and finally ending in a valid filename, for example,
* <code>com/google/gwt/blah.txt</code>.
*
* <p>
* The identity of the returned sets and maps will change when the underlying
* module is refreshed.
* </p>
*/
public interface ResourceOracle {
/**
* Frees up all existing resources and transient internal state. All returned
* collections will be empty after this call until this ResourceOracle is
* refreshed.
*/
void clear();
/**
* Returns an unmodifiable set of unique abstract path names with constant
* lookup time.
*/
Set<String> getPathNames();
/**
* Returns an unmodifiable map of abstract path name to resource.
*/
Map<String, Resource> getResourceMap();
/**
* Returns an unmodifiable set of unique resources with constant lookup time.
*/
Set<Resource> getResources();
}