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/*
* Copyright (c) 2019 TOYOTA MOTOR CORPORATION
*
* 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 app.market.persistence.interceptor;
import java.sql.Connection;
import java.util.Properties;
import java.util.regex.Pattern;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.reflect.FieldUtils;
import org.apache.ibatis.executor.statement.StatementHandler;
import org.apache.ibatis.mapping.BoundSql;
import org.apache.ibatis.plugin.Interceptor;
import org.apache.ibatis.plugin.Intercepts;
import org.apache.ibatis.plugin.Invocation;
import org.apache.ibatis.plugin.Plugin;
import org.apache.ibatis.plugin.Signature;
import org.apache.ibatis.session.RowBounds;
@Intercepts(@Signature(type = StatementHandler.class, method = "prepare", args = { Connection.class }))
public class PaginationInterceptor implements Interceptor {
private final static String SQL_SELECT_REGEX = "(?is)^\\s*SELECT.*$";
private final static String SQL_COUNT_REGEX = "(?is)^\\s*SELECT\\s+COUNT\\s*\\(\\s*(?:\\*|\\w+)\\s*\\).*$";
@Override
public Object intercept(Invocation inv) throws Throwable {
StatementHandler target = (StatementHandler) inv.getTarget();
BoundSql boundSql = target.getBoundSql();
String sql = boundSql.getSql();
if ( StringUtils.isBlank( sql ) ) {
return inv.proceed();
}
if ( sql.matches( SQL_SELECT_REGEX ) && !Pattern.matches( SQL_COUNT_REGEX, sql ) ) {
Object obj = FieldUtils.readField( target, "delegate", true );
RowBounds rowBounds = (RowBounds) FieldUtils.readField( obj, "rowBounds", true );
if ( rowBounds != null && rowBounds != RowBounds.DEFAULT ) {
FieldUtils.writeField( boundSql, "sql", newSql( sql, rowBounds ), true );
FieldUtils.writeField( rowBounds, "offset", RowBounds.NO_ROW_OFFSET, true );
FieldUtils.writeField( rowBounds, "limit", RowBounds.NO_ROW_LIMIT, true );
}
}
return inv.proceed();
}
public String newSql(String oldSql, RowBounds rowBounds) {
String end = " limit " + rowBounds.getOffset() + "," + rowBounds.getLimit();
return oldSql + end;
}
@Override
public Object plugin(Object target) {
return Plugin.wrap( target, this );
}
@Override
public void setProperties(Properties arg0) {
}
}
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