Java tutorial
/* * 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.teradata.benchto.driver.loader; import com.google.common.base.Splitter; import com.google.common.collect.ImmutableList; import com.teradata.benchto.driver.BenchmarkExecutionException; import com.teradata.benchto.driver.Query; import freemarker.template.Configuration; import freemarker.template.Template; import freemarker.template.TemplateException; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.stereotype.Component; import org.springframework.ui.freemarker.FreeMarkerTemplateUtils; import java.io.IOException; import java.io.StringReader; import java.util.List; import java.util.Map; import java.util.UUID; @Component public class SqlStatementGenerator { private static final Splitter SQL_STATEMENT_SPLITTER = Splitter.on(";").trimResults().omitEmptyStrings(); @Autowired private Configuration freemarkerConfiguration; public List<String> generateQuerySqlStatement(Query query, Map<String, ?> attributes) { ImmutableList.Builder<String> sqlQueries = ImmutableList.<String>builder(); String sqlTemplate = generateQuerySqlStatement(query.getSqlTemplate(), attributes); for (String sqlQuery : toSqlQueries(sqlTemplate)) { sqlQueries.add(sqlQuery); } return sqlQueries.build(); } private static ImmutableList<String> toSqlQueries(String sqlTemplate) { return ImmutableList.copyOf(SQL_STATEMENT_SPLITTER.split(sqlTemplate)); } private String generateQuerySqlStatement(String sqlTemplate, Map<String, ?> attributes) { try { // template name must be unique to ensure correct templates caching String templateName = UUID.randomUUID().toString(); Template queryTemplate = new Template(templateName, new StringReader(sqlTemplate), freemarkerConfiguration); return FreeMarkerTemplateUtils.processTemplateIntoString(queryTemplate, attributes); } catch (IOException | TemplateException e) { throw new BenchmarkExecutionException(e); } } }