PagedListDataModel.java

package in.srain.cube.views.list;

import java.util.List;

public abstract class PagedListDataModel<T> {

    protected abstract void doQueryData();

    protected ListPageInfo<T> mListPageInfo;

    private PagedListDataHandler mPagedListDataHandler;

    public interface PagedListDataHandler {
        public void onPageDataLoaded(ListPageInfo<?> listPageInfo);
    }

    public void setPageListDataHandler(PagedListDataHandler handler) {
        mPagedListDataHandler = handler;
    }

    public void queryFirstPage() {
        checkPageInfo();
        mListPageInfo.goToHead();
        doQueryDataInner();
    }

    public void queryNextPage() {
        checkPageInfo();
        if (mListPageInfo.nextPage()) {
            doQueryDataInner();
        }
    }

    private void checkPageInfo() {
        if (null == mListPageInfo) {
            throw new IllegalArgumentException(" mListPageInfo has not been initialized.");
        }
    }

    private void doQueryDataInner() {
        if (!mListPageInfo.tryEnterLock()) {
            return;
        }
        doQueryData();
    }

    protected void setRequestResult(List<T> list, int total) {
        mListPageInfo.updateListInfo(list, total);
        if (null != mPagedListDataHandler) {
            mPagedListDataHandler.onPageDataLoaded(mListPageInfo);
        }
    }

    protected void setRequestResult(List<T> list, boolean hasMore) {
        mListPageInfo.updateListInfo(list, hasMore);
        if (null != mPagedListDataHandler) {
            mPagedListDataHandler.onPageDataLoaded(mListPageInfo);
        }
    }

    public ListPageInfo<T> getListPageInfo() {
        return mListPageInfo;
    }
}