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The Java Data Objects API (JDO) : a standard interface-based Java model abstraction of persistence, developed by the JCP.

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 javax.jdo.query;

import java.util.Collection;

/**
 * Representation of a collection in a query.
 * 
 * @param  Java type being represented here
 * @param  Element type of the collection being represented here
 */
public interface CollectionExpression, E> extends Expression
{
    /**
     * Method returning whether the specified element expression is contained in this collection.
     * @param expr The element expression
     * @return Whether it is contained here
     */
    BooleanExpression contains(Expression expr);

    /**
     * Method returning whether the specified element is contained in this collection.
     * @param elem The element
     * @return Whether it is contained here
     */
    BooleanExpression contains(E elem);

    /**
     * Method returning whether the collection is empty.
     * @return Whether it is empty
     */
    BooleanExpression isEmpty();

    /**
     * Method returning an expression for the size of the collection
     * @return The size
     */
    NumericExpression size();
}