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102
core/impl/src/main/java/com/blazebit/persistence/impl/function/cast/DB2CastFunction.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| /* | ||
| * Copyright 2014 - 2020 Blazebit. | ||
| * | ||
| * 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.blazebit.persistence.impl.function.cast; | ||
|
|
||
| import com.blazebit.persistence.impl.util.JpqlFunctionUtil; | ||
| import com.blazebit.persistence.spi.DbmsDialect; | ||
| import com.blazebit.persistence.spi.FunctionRenderContext; | ||
|
|
||
| /** | ||
| * @author Christian Beikov | ||
| * @since 1.2.0 | ||
| */ | ||
| public class DB2CastFunction extends CastFunction { | ||
|
|
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| private static final String[] CLOB_RETURNING_FUNCTIONS = new String[] { | ||
| "json_value(", | ||
| "json_query(" | ||
| }; | ||
| private static final String[] CLOB_COMPATIBLE_CAST_TARGET_TYPES = new String[] { | ||
| "char", | ||
| "varchar", | ||
| "graphic", | ||
| "vargraphic", | ||
| "dbclob", | ||
| "blob", | ||
| "xml" | ||
| }; | ||
|
|
||
| public DB2CastFunction(Class<?> castType, DbmsDialect dbmsDialect) { | ||
| super(castType, dbmsDialect); | ||
| } | ||
|
|
||
| @Override | ||
| public void render(FunctionRenderContext context) { | ||
| if (context.getArgumentsSize() != 1 && context.getArgumentsSize() != 2) { | ||
| throw new RuntimeException("The " + functionName + " function needs one argument <expression> with an optional second argument <sql-type-name>! args=" + context); | ||
| } | ||
| String effectiveCastTargetType; | ||
| if (context.getArgumentsSize() == 1) { | ||
| effectiveCastTargetType = defaultSqlCastType; | ||
| } else { | ||
| effectiveCastTargetType = JpqlFunctionUtil.unquoteSingleQuotes(context.getArgument(1)); | ||
| } | ||
| boolean insertVarcharCast = isClobReturningFunction(context.getArgument(0)) && !isClobCompatibleCastTarget(effectiveCastTargetType); | ||
| context.addChunk("cast("); | ||
| if (insertVarcharCast) { | ||
| context.addChunk("cast("); | ||
| } | ||
| context.addArgument(0); | ||
| if (insertVarcharCast) { | ||
| context.addChunk(" as varchar(32000))"); | ||
| } | ||
| context.addChunk(" as "); | ||
| context.addChunk(effectiveCastTargetType); | ||
| context.addChunk(")"); | ||
| } | ||
|
|
||
| @Override | ||
| public String getCastExpression(String argument) { | ||
| boolean insertVarcharCast = isClobReturningFunction(argument) && !isClobCompatibleCastTarget(defaultSqlCastType); | ||
| if (insertVarcharCast) { | ||
| return "cast(cast(" + argument + " as varchar(32000)) as " + defaultSqlCastType + ")"; | ||
| } else { | ||
| return "cast(" + argument + " as " + defaultSqlCastType + ")"; | ||
| } | ||
| } | ||
|
|
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| private static boolean isClobReturningFunction(String castSource) { | ||
| for (int i = 0; i < CLOB_RETURNING_FUNCTIONS.length; i++) { | ||
| if (castSource.toLowerCase().startsWith(CLOB_RETURNING_FUNCTIONS[i])) { | ||
| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
|
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| private static boolean isClobCompatibleCastTarget(String castTargetType) { | ||
| for (int i = 0; i < CLOB_COMPATIBLE_CAST_TARGET_TYPES.length; i++) { | ||
| if (castTargetType.toLowerCase().indexOf(CLOB_COMPATIBLE_CAST_TARGET_TYPES[i]) == 0 && | ||
| (castTargetType.length() == CLOB_COMPATIBLE_CAST_TARGET_TYPES[i].length() || | ||
| castTargetType.charAt(CLOB_COMPATIBLE_CAST_TARGET_TYPES[i].length()) == '(') | ||
| ) { | ||
| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
| } |
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