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/*
* 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 org.apache.tuscany.das.rdb.impl;
import org.apache.tuscany.das.rdb.Command;
import org.apache.tuscany.das.rdb.Pager;
import commonj.sdo.DataObject;
public class PagerImpl implements Pager {
private final ReadCommandImpl command;
private final int size;
private int idx = 1;
public PagerImpl(Command command, int size) {
this.command = (ReadCommandImpl) command;
this.command.enablePaging();
this.size = size;
}
public DataObject next() {
int start = idx;
int end = idx + size;
idx += size;
command.setStartRow(start);
command.setEndRow(end);
return command.executeQuery();
}
public DataObject getPage(int page) {
int end = (page * size) + 1;
int start = end - size;
idx = end;
command.setStartRow(start);
command.setEndRow(end);
return command.executeQuery();
}
public DataObject previous() {
int start = idx - (2 * size);
if (start < 1) {
start = 1;
}
int end = start + size;
idx = end;
command.setStartRow(start);
command.setEndRow(end);
return command.executeQuery();
}
}
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