com.mysql.cj.result.BufferedRowList Maven / Gradle / Ivy
/*
* Copyright (c) 2015, 2020, Oracle and/or its affiliates.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
* authors of MySQL hereby grant you an additional permission to link the
* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
* http://oss.oracle.com/licenses/universal-foss-exception.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License, version 2.0,
* for more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
package com.mysql.cj.result;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Spliterators;
import java.util.stream.Collectors;
import java.util.stream.StreamSupport;
public class BufferedRowList implements RowList {
private List rowList;
private int position = -1;
public BufferedRowList(List rowList) {
this.rowList = rowList;
}
/**
* Create a new instance by filling the internal buffer by draining the row stream.
*
* @param ris
* {@link Row}s iterator
*/
public BufferedRowList(Iterator ris) {
this.rowList = StreamSupport.stream(Spliterators.spliteratorUnknownSize(ris, 0), false).collect(Collectors.toList());
}
public Row next() {
if (this.position + 1 == this.rowList.size()) {
throw new NoSuchElementException("Can't next() when position=" + this.position + " and size=" + this.rowList.size());
}
return this.rowList.get(++this.position);
}
public Row previous() {
if (this.position < 1) {
throw new NoSuchElementException("Can't previous() when position=" + this.position);
}
return this.rowList.get(--this.position);
}
public Row get(int n) {
if (n < 0 || n >= this.rowList.size()) {
throw new NoSuchElementException("Can't get(" + n + ") when size=" + this.rowList.size());
}
return this.rowList.get(n);
}
public int getPosition() {
return this.position;
}
public int size() {
return this.rowList.size();
}
public boolean hasNext() {
return this.position + 1 < this.rowList.size();
}
}