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- /*
- Copyright (c) 2021 James Ahlborn
-
- 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.healthmarketscience.jackcess.impl;
-
- import java.io.IOException;
-
- /**
- * Helper class to isolate the java.sql module interactions from the core of
- * jackcess (in java 9+ environments). If the module is enabled (indicating
- * that the application is already using sql constructs), then jackcess will
- * seamlessly interact with sql types. If the module is not enabled
- * (indicating that the application is not using any sql constructs), then
- * jackcess will not require the module in order to function otherwise
- * normally.
- *
- * This base class is the "fallback" class if the java.sql module is not
- * available.
- *
- * @author James Ahlborn
- */
- public class SqlHelper {
-
- public static final SqlHelper INSTANCE = loadInstance();
-
- public SqlHelper() {}
-
- public boolean isBlob(Object value) {
- return false;
- }
-
- public byte[] getBlobBytes(Object value) throws IOException {
- throw new UnsupportedOperationException();
- }
-
- public boolean isClob(Object value) {
- return false;
- }
-
- public CharSequence getClobString(Object value) throws IOException {
- throw new UnsupportedOperationException();
- }
-
- public Integer getNewSqlType(String typeName) throws Exception {
- throw new UnsupportedOperationException();
- }
-
- private static final SqlHelper loadInstance() {
- // attempt to load the implementation of this class which works with
- // java.sql classes. if that fails, use this fallback instance instead.
- try {
- return (SqlHelper)
- Class.forName("com.healthmarketscience.jackcess.impl.SqlHelperImpl")
- .newInstance();
- } catch(Throwable ignored) {}
- return new SqlHelper();
- }
- }
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