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/*
* Copyright (C) 2008 The Guava Authors
*
* 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.common.collect.testing;
import java.util.Collection;
import java.util.List;
import java.util.Map;
/**
* To be implemented by test generators of things that can contain
* elements. Such things include both {@link Collection} and {@link Map}; since
* there isn't an established collective noun that encompasses both of these,
* 'container' is used.
*
* <p>This class is GWT compatible.
*
* @author George van den Driessche
*/
public interface TestContainerGenerator<T, E> {
/**
* Returns the sample elements that this generate populates its container
* with.
*/
SampleElements<E> samples();
/**
* Creates a new container containing the given elements. TODO: would be nice
* to figure out how to use E... or E[] as a parameter type, but this doesn't
* seem to work because Java creates an array of the erased type.
*/
T create(Object ... elements);
/**
* Helper method to create an array of the appropriate type used by this
* generator. The returned array will contain only nulls.
*/
E[] createArray(int length);
/**
* Returns the iteration ordering of elements, given the order in
* which they were added to the container. This method may return the
* original list unchanged, the original list modified in place, or a
* different list.
*
* <p>This method runs only when {@link
* com.google.common.collect.testing.features.CollectionFeature#KNOWN_ORDER}
* is specified when creating the test suite. It should never run when testing
* containers such as {@link java.util.HashSet}, which have a
* non-deterministic iteration order.
*/
Iterable<E> order(List<E> insertionOrder);
}
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