org.apache.openjpa.kernel.exps.Size Maven / Gradle / Ivy

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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 org.apache.openjpa.kernel.exps;

import java.util.Collection;
import java.util.Map;


/**
 * Returns the count of a collection.
 *
 * @author Marc Prud'hommeaux
 */
class Size
    extends UnaryMathVal {

    public Size(Val val) {
        super(val);
    }

    protected Class getType(Class c) {
        return int.class;
    }

    protected Object operate(Object o, Class c) {
        if (o instanceof Collection)
            return ((Collection) o).size();
        if (o instanceof Map)
            return ((Map) o).size();
        return (o == null) ? 0 : 1;
    }
}