com.blazebit.persistence.impl.dialect.PostgreSQLDbmsLimitHandler Maven / Gradle / Ivy
/*
* 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.dialect;
import com.blazebit.persistence.impl.util.BoyerMooreCaseInsensitiveAsciiLastPatternFinder;
import com.blazebit.persistence.impl.util.PatternFinder;
/**
* @author Christian Beikov
* @since 1.2.0
*/
public class PostgreSQLDbmsLimitHandler extends DefaultDbmsLimitHandler {
private static final PatternFinder RETURNING_FINDER = new BoyerMooreCaseInsensitiveAsciiLastPatternFinder("returning ");
public PostgreSQLDbmsLimitHandler() {
}
public PostgreSQLDbmsLimitHandler(int length) {
super(length);
}
@Override
public void applySql(StringBuilder sqlSb, boolean isSubquery, String limit, String offset) {
// The RETURNING clause must be the last, so we find the index at which we should insert
int returningIndex = RETURNING_FINDER.indexIn(sqlSb);
returningIndex = returningIndex == -1 ? sqlSb.length() : returningIndex - 1;
if (sqlSb.indexOf(")", returningIndex) >= 0) {
returningIndex = sqlSb.length();
}
if (offset != null) {
sqlSb.insert(returningIndex, " offset " + offset);
}
if (limit != null) {
sqlSb.insert(returningIndex, " limit " + limit);
}
}
}