JSF, RichFaces, pagination

Question

I know there are quite a number of posts regarding JSF paginatin here, but none of them satisfed me.

To split pretty big data into pages I was going to use RichFaces

Answer 1

After talking on RichFaces forum came up this the following solution (thanx to Brendan Healey):

RichLazyDataModel.java

/**
 * Extended data model
 * @author Brendan Healey
 */
public abstract class RichLazyDataModel extends ExtendedDataModel {

private SequenceRange cachedRange;
private Integer cachedRowCount;
private List cachedList;
private Object rowKey;

public abstract List getDataList(int firstRow, int numRows);
public abstract Object getKey(T t);
public abstract int getTotalCount();

@Override
public void walk(FacesContext ctx, DataVisitor dv, Range range, Object argument) {

    SequenceRange sr = (SequenceRange) range;

    if (cachedList == null || !equalRanges(cachedRange, sr)) {
        cachedList = getDataList(sr.getFirstRow(), sr.getRows());
        cachedRange = sr;
    }

    for (T t : cachedList) {
        if (getKey(t) == null) {
            /*
            * the 2nd param is used to build the client id of the table
            * row, i.e. mytable:234:inputname, so don't let it be null.
            */
            throw new IllegalStateException("found null key");
        }
        dv.process(ctx, getKey(t), argument);
    }

}


/*
* The rowKey is the id from getKey, presumably obtained from
* dv.process(...).
*/
@Override
public void setRowKey(Object rowKey) {
    this.rowKey = rowKey;
}

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

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

@Override
public int getRowCount() {
    if (cachedRowCount == null) {
        cachedRowCount = getTotalCount();
    }
    return cachedRowCount;
}

@Override
public T getRowData() {
    for (T t : cachedList) {
        if (getKey(t).equals(this.getRowKey())) {
            return t;
        }
    }
    return null;
}

protected static boolean equalRanges(SequenceRange range1, SequenceRange range2) {
    if (range1 == null || range2 == null) {
        return range1 == null && range2 == null;
    } else {
        return range1.getFirstRow() == range2.getFirstRow() && range1.getRows() == range2.getRows();
    }
}



/*
* get/setRowIndex are used when doing multiple select in an
* extendedDataTable, apparently. Not tested. Actually, the get method is
* used when using iterationStatusVar="it" & #{it.index}.
*/
@Override
public int getRowIndex() {
    if (cachedList != null) {
        ListIterator it = cachedList.listIterator();
        while (it.hasNext()) {
            T t = it.next();
            if (getKey(t).equals(this.getRowKey())) {
                return it.previousIndex() + cachedRange.getFirstRow();
            }
        }
    }
    return -1;
}

@Override
public void setRowIndex(int rowIndex) {
    int upperBound = cachedRange.getFirstRow() + cachedRange.getRows();
    if (rowIndex >= cachedRange.getFirstRow() && rowIndex < upperBound) {
        int index = rowIndex % cachedRange.getRows();
        T t = cachedList.get(index);
        setRowKey(getKey(t));
    }
}

@Override
public Object getWrappedData() {
    throw new UnsupportedOperationException("Not supported yet.");
}

@Override
public void setWrappedData(Object data) {
    throw new UnsupportedOperationException("Not supported yet.");

}

public List getCachedList() {
    return cachedList;
}

}

ListState.java

/**
 * Holds list state
 */
public class ListState implements Serializable {

private int page;

private Map searchCriteria = new HashMap();

public int getPage() {
    return page;
}

public void setPage(int page) {
    this.page = page;
}

public Map getSearchCriteria() {
    return searchCriteria;
}

}

CardsBean.java

@ManagedBean(name="cardsBean")
public class CardsBean {

@ManagedProperty("#{cardService}")
private CardService cardService;

private ListState state;

private RichLazyDataModel cardsModel = new RichLazyDataModel() {
    @Override
    public List getDataList(int firstRow, int numRows) {
        MyUserDetails user = SecurityUtils.getCurrentUser();
        return cardService.findUserCards(user.getUser(), firstRow, numRows, state.getSearchCriteria());
    }

    @Override
    public Object getKey(Card card) {
        return card.getId();
    }

    @Override
    public int getTotalCount() {
        MyUserDetails user = SecurityUtils.getCurrentUser();
        return cardService.countUserCards(user.getUser(), state.getSearchCriteria());
    }
};


public RichLazyDataModel getCards() {
    return cardsModel;
}

public String getSearchString() {
    return (String)state.getSearchCriteria().get("searchString");
}

public int getCurrentPage() {
    return state.getPage();
}

public void setCurrentPage(int page) {
    state.setPage(page);
}

public void setSearchString(String searchString) {
    state.getSearchCriteria().put("searchString", searchString);
}

public void setCardService(CardService cardService) {
    this.cardService = cardService;
}

public boolean isPinned() {
    return Boolean.TRUE.equals(state.getSearchCriteria().get("pinned"));
}

public void setPinned(boolean pinned) {
    state.getSearchCriteria().put("pinned", pinned);
}

public void togglePinned() {
    setPinned(!isPinned());
}

@PostConstruct
public void init() {
    state = getFromSession("cardsList", null);
    if (state == null) {
        state = new ListState();
        storeInSession("cardsList", state);
    }
}

public  T getFromSession(String name, T defaultValue) {
    T ret = (T) FacesContext.getCurrentInstance().getExternalContext().getSessionMap().get(name);
    if (ret == null) {
        ret = defaultValue;
    }
    return ret;
}

public void storeInSession(String name, Serializable obj) {
    FacesContext.getCurrentInstance().getExternalContext().getSessionMap().put(name, obj);
}
}

cards.xhtml (partial)

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