Many resources are needed to download a project. Please understand that we have to compensate our server costs. Thank you in advance. Project price only 1 $
You can buy this project and download/modify it how often you want.
/**
* Copyright (C) 2015-2017, Zhichun Wu
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.github.cassandra.jdbc;
import org.pmw.tinylog.Level;
import org.pmw.tinylog.Logger;
import java.sql.SQLException;
import java.util.Arrays;
/**
* Dummy result set that is read-only. It's mainly used to wrap meta data.
*
* @author Zhichun Wu
*/
public class DummyCassandraResultSet extends BaseCassandraResultSet {
private static final Level LOG_LEVEL = Logger.getLevel(DummyCassandraResultSet.class);
private Object[] currentRow;
private final Object[][] data;
/**
* This creates an empty result set.
*/
public DummyCassandraResultSet() {
this(new String[0][], null);
}
/**
* This creates a result set based on given data and column definitions.
*
* @param columns column definitions, name and its Cql type
* @param data rows
*/
public DummyCassandraResultSet(String[][] columns, Object[][] data) {
super(null, null);
Logger.trace("Constructing dummy result set @{}...", hashCode());
if (columns != null && columns.length > 0 && columns[0].length > 1) {
for (String[] column : columns) {
Logger.trace("* Column: {name={}, cqlType={}}", column[0], column[1]);
metadata.addColumnDefinition(new CassandraColumnDefinition(
null, null, column[0], column[1], false));
}
}
this.data = data == null ? new String[0][] : data;
if (LOG_LEVEL.compareTo(Level.TRACE) >= 0) {
for (Object[] row : this.data) {
Logger.trace("* Row: {}", Arrays.toString(row));
}
}
Logger.trace("Dummy result set @{} is ready for use", hashCode());
}
@SuppressWarnings("unchecked")
@Override
protected T getValue(int columnIndex, Class clazz)
throws SQLException {
Logger.trace("Trying to get value with inputs: line={}, column={}, type={}", getRow(), columnIndex, clazz);
Object obj = currentRow[columnIndex - 1];
T result = null;
Logger.trace("Got raw value [{}] from line {} of {}", obj, getRow(), data.length);
wasNull = obj == null;
result = this.getDataTypeConverters().convert(obj, clazz, false);
Logger.trace("Return value: raw={}, converted={}", obj, result);
return result;
}
@Override
protected boolean hasMore() {
return getCurrentRowIndex() < data.length;
}
@Override
protected void setValue(int columnIndex, T value) throws SQLException {
throw CassandraErrors.notSupportedException();
}
@Override
protected SQLException tryClose() {
return null;
}
@Override
protected boolean tryIterate() throws SQLException {
int row = getCurrentRowIndex();
boolean success = row < data.length;
if (success) {
currentRow = data[row];
}
return success;
}
@Override
protected boolean tryMoveTo(int rows, boolean relativeIndex)
throws SQLException {
throw CassandraErrors.notSupportedException();
}
@Override
protected Object unwrap() {
return this;
}
public int getColumnCount() {
return data.length > 0 && data[0] != null ? data[0].length
: 0;
}
public int getRowCount() {
return data.length == 0 ? 0 : data.length;
}
}