FuncKEY_ID.java :  » Google-tech » audao » com » spoledge » audao » parser » gql » impl » soft » func » Java Open Source

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audao » com » spoledge » audao » parser » gql » impl » soft » func » FuncKEY_ID.java
/*
 * Copyright 2010 Spolecne s.r.o. (www.spoledge.com)
 *
 * 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.spoledge.audao.parser.gql.impl.soft.func;

import com.google.appengine.api.datastore.Key;


/**
 * KEY_ID( __key__ )
 *      - returns the Long id of the key or null if not assigned.
 */
public class FuncKEY_ID extends KeyFunc1 {

    ////////////////////////////////////////////////////////////////////////////
    // Protected
    ////////////////////////////////////////////////////////////////////////////

    protected Object getFunctionValue( Key arg ) {
        long ret = arg.getId();

        return ret > 0 ? ret : null;
    }

}

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