com.jn.sqlhelper.dialect.instrument.orderby.DefaultOrderByTransformer Maven / Gradle / Ivy
package com.jn.sqlhelper.dialect.instrument.orderby;
import com.jn.sqlhelper.dialect.instrument.AbstractClauseTransformer;
import com.jn.sqlhelper.dialect.instrument.TransformConfig;
import com.jn.sqlhelper.dialect.sqlparser.SqlStatementWrapper;
import com.jn.sqlhelper.dialect.sqlparser.StringSqlStatementWrapper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* 是自定义 OrderByTransformer 的代理，优先使用自定义的 OrderByTransformer 进行SQL转换，如果找不到自定义的 OrderByTransformer，或者自定义的 OrderByTransformer
* 转换失败，则会自动采用 SimpleOrderByTransformer 进行转换
*/
@SuppressWarnings("rawtypes")
public class DefaultOrderByTransformer extends AbstractClauseTransformer implements OrderByTransformer {
private final SimpleOrderByTransformer simpleTransformer = new SimpleOrderByTransformer();
private static final Logger logger = LoggerFactory.getLogger(DefaultOrderByTransformer.class);
@Override
protected void doInit() {
}
@Override
public SqlStatementWrapper transform(final SqlStatementWrapper statement, final TransformConfig config) {
OrderByTransformer orderByTransformer = null;
try {
orderByTransformer = getInstrumentation().getOrderByTransformer();
if (orderByTransformer != null) {
return orderByTransformer.transform(statement, config);
}
} catch (Throwable ex) {
logger.debug(ex.getMessage(), ex);
}
if (!simpleTransformer.isTransformable(statement)) {
SqlStatementWrapper sw = new StringSqlStatementWrapper();
sw.setOriginalSql(statement.getOriginalSql());
sw.setChanged(statement.isChanged());
sw.setStatement(statement.getSql());
return simpleTransformer.transform(sw, config);
} else {
return simpleTransformer.transform(statement, config);
}
}
}