ec1b840cb5
- Add SQLDialect.family() to group several SQLDialect versions of the same RDBMS - Add support for SQL Server 2012 native OFFSET .. FETCH clause
105 lines
3.9 KiB
Java
105 lines
3.9 KiB
Java
/**
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* Copyright (c) 2009-2013, Lukas Eder, lukas.eder@gmail.com
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* All rights reserved.
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*
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* This software is licensed to you under the Apache License, Version 2.0
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* (the "License"); You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* . Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* . Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* . Neither the name "jOOQ" nor the names of its contributors may be
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* used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.jooq.impl;
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import static org.jooq.impl.DSL.function;
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import org.jooq.Configuration;
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import org.jooq.DataType;
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import org.jooq.Field;
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/**
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* @author Lukas Eder
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*/
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class Greatest<T> extends AbstractFunction<T> {
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/**
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* Generated UID
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*/
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private static final long serialVersionUID = -7273879239726265322L;
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Greatest(DataType<T> type, Field<?>... arguments) {
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super("greatest", type, arguments);
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}
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@SuppressWarnings("unchecked")
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@Override
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final Field<T> getFunction0(Configuration configuration) {
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// In any dialect, a single argument is always the greatest
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if (getArguments().length == 1) {
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return (Field<T>) getArguments()[0];
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}
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switch (configuration.dialect().family()) {
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// This implementation has O(2^n) complexity. Better implementations
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// are very welcome
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// [#1049] TODO Fix this!
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case ASE:
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case DERBY:
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case SQLSERVER:
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case SYBASE: {
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Field<T> first = (Field<T>) getArguments()[0];
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Field<T> other = (Field<T>) getArguments()[1];
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if (getArguments().length > 2) {
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Field<?>[] remaining = new Field[getArguments().length - 2];
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System.arraycopy(getArguments(), 2, remaining, 0, remaining.length);
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return DSL.decode()
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.when(first.greaterThan(other), DSL.greatest(first, remaining))
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.otherwise(DSL.greatest(other, remaining));
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}
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else {
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return DSL.decode()
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.when(first.greaterThan(other), first)
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.otherwise(other);
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}
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}
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case FIREBIRD:
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return function("maxvalue", getDataType(), getArguments());
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case SQLITE:
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return function("max", getDataType(), getArguments());
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default:
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return function("greatest", getDataType(), getArguments());
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}
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}
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}
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