com.google.gwt.dev.resource.ResourceOracle.java Source code

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Here is the source code for com.google.gwt.dev.resource.ResourceOracle.java

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/*
 * 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();
}