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/**
*
* Copyright 2005 The Apache Software Foundation or its licensors, as applicable.
*
* 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 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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