ProcessesFactory.java

/**
 *  C-Nery - A home automation web application for C-Bus.
 *  Copyright (C) 2008,2009,2012  Dave Oxley <dave@daveoxley.co.uk>.
 *
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as
 *  published by the Free Software Foundation, either version 3 of the
 *  License, or (at your option) any later version.
 *
 *  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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

package com.daveoxley.cnery.factories;

import com.workplacesystems.queuj.Process;
import com.workplacesystems.queuj.process.ProcessImplServer;
import com.workplacesystems.queuj.process.QueujFactory;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;
import javax.faces.context.FacesContext;
import org.jboss.seam.ScopeType;
import org.jboss.seam.annotations.Factory;
import org.jboss.seam.annotations.Name;
import org.jboss.seam.annotations.Transactional;
import org.ajax4jsf.model.DataVisitor;
import org.ajax4jsf.model.ExtendedDataModel;
import org.ajax4jsf.model.Range;
import org.ajax4jsf.model.SequenceRange;

/**
 *
 * @author dave
 */
@Name("processesFactory")
public class ProcessesFactory implements Serializable {

    private ProcessImplServer<Integer> processImplServer = (ProcessImplServer<Integer>)QueujFactory.getProcessServer((String)null, null);

    @Factory(value="processesDataModel",autoCreate=true,scope=ScopeType.EVENT)
    @Transactional
    public ExtendedDataModel<Process> updateProcesses() {
        return new ExtendedDataModel<Process>() {

            private Integer current_key = null;
            private int firstRow = 0;
            private List<Process> cache = new ArrayList<Process>();

            @Override
            public void setRowKey(Object o) {
                this.current_key = (Integer)o;
            }

            @Override
            public Object getRowKey() {
                return current_key;
            }

            @Override
            public void walk(FacesContext fc, DataVisitor dv, Range range, Object argument) {
                firstRow = ((SequenceRange)range).getFirstRow();
                int numberOfRows = ((SequenceRange)range).getRows();
                int lastRow = numberOfRows > 0 ? firstRow + numberOfRows : processImplServer.size();
                if (lastRow > processImplServer.size())
                    lastRow = processImplServer.size();
                cache.clear();
                for (Process<Integer> v : processImplServer.subList(firstRow, lastRow)) {
                    Integer key = v.getProcessKey();
                    cache.add(v);
                    dv.process(fc, key, argument);
                }
            }

            @Override
            public boolean isRowAvailable() {
                return current_key != null;
            }

            @Override
            public int getRowCount() {
                return processImplServer.size();
            }

            @Override
            public Process getRowData() {
                if (current_key == null)
                    return null;

                return new Process<Integer>(processImplServer.get(current_key));
            }

            @Override
            public int getRowIndex() {
                Process<Integer> value = getRowData();
                if (value == null)
                    return -1;
                return cache.indexOf(value) + firstRow;
            }

            @Override
            public void setRowIndex(int rowIndex) {
                Process<Integer> value = cache.get(rowIndex - firstRow);
                if (value != null)
                    this.current_key = value.getProcessKey();
            }

            @Override
            public Object getWrappedData() {
                throw new UnsupportedOperationException();
            }

            @Override
            public void setWrappedData(Object data) {
                throw new UnsupportedOperationException();
            }
        };
    }
}