com.mysema.query.jpa.support.ExtendedDerbyDialect.java Source code

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Here is the source code for com.mysema.query.jpa.support.ExtendedDerbyDialect.java

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/*
 * Copyright 2011, Mysema Ltd
 * 
 * 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.mysema.query.jpa.support;

import java.util.Arrays;
import java.util.List;

import org.hibernate.dialect.DerbyDialect;
import org.hibernate.dialect.function.CastFunction;
import org.hibernate.dialect.function.VarArgsSQLFunction;
import org.hibernate.engine.spi.SessionFactoryImplementor;
import org.hibernate.type.StandardBasicTypes;
import org.hibernate.type.Type;

/**
 * @author tiwe
 *
 */
public class ExtendedDerbyDialect extends DerbyDialect {

    private static final CastFunction castFunction = new CastFunction() {
        @Override
        public String render(Type columnType, List args, SessionFactoryImplementor factory) {
            if (args.get(1).equals("string")) {
                return super.render(columnType, Arrays.<Object>asList("char(" + args.get(0) + ")", args.get(1)),
                        factory);
            } else {
                return super.render(columnType, args, factory);
            }
        }
    };

    public ExtendedDerbyDialect() {
        registerFunction("concat",
                new VarArgsSQLFunction(StandardBasicTypes.STRING, "cast ((", "||", ") as varchar(128))"));
        registerFunction("cast", castFunction);
    }

}