/*
* Copyright 1999-2015 dangdang.com.
* <p>
* 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.
* </p>
*/
package com.dangdang.ddframe.rdb.sharding.jdbc.adapter;
import com.dangdang.ddframe.rdb.sharding.jdbc.unsupported.AbstractUnsupportedOperationResultSet;
import com.dangdang.ddframe.rdb.sharding.util.SQLUtil;
import com.dangdang.ddframe.rdb.sharding.util.ThrowableSQLExceptionMethod;
import com.google.common.base.Preconditions;
import lombok.AccessLevel;
import lombok.Getter;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.collections4.map.CaseInsensitiveMap;
import java.sql.ResultSet;
import java.sql.ResultSetMetaData;
import java.sql.SQLException;
import java.util.List;
import java.util.Map;
/**
* 代理结果集适配器.
*
* @author zhangliang
*/
@Slf4j
public abstract class AbstractResultSetAdapter extends AbstractUnsupportedOperationResultSet {
@Getter(AccessLevel.PROTECTED)
private final List<ResultSet> resultSets;
@Getter
private final Map<String, Integer> columnLabelIndexMap;
private boolean closed;
public AbstractResultSetAdapter(final List<ResultSet> resultSets) throws SQLException {
Preconditions.checkArgument(!resultSets.isEmpty());
this.resultSets = resultSets;
columnLabelIndexMap = generateColumnLabelIndexMap();
}
private Map<String, Integer> generateColumnLabelIndexMap() throws SQLException {
ResultSetMetaData resultSetMetaData = resultSets.get(0).getMetaData();
Map<String, Integer> result = new CaseInsensitiveMap<>(resultSetMetaData.getColumnCount());
for (int i = 1; i <= resultSetMetaData.getColumnCount(); i++) {
result.put(resultSetMetaData.getColumnLabel(i), i);
}
return result;
}
@Override
public final void close() throws SQLException {
SQLUtil.safeInvoke(resultSets, new ThrowableSQLExceptionMethod<ResultSet>() {
@Override
public void apply(final ResultSet object) throws SQLException {
object.close();
}
});
closed = true;
}
@Override
public final boolean isClosed() throws SQLException {
return closed;
}
@Override
public final void setFetchDirection(final int direction) throws SQLException {
for (ResultSet each : resultSets) {
each.setFetchDirection(direction);
}
}
@Override
public final void setFetchSize(final int rows) throws SQLException {
for (ResultSet each : resultSets) {
each.setFetchSize(rows);
}
}
}