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## com.bea.p13n.pagination
Interface PagedResult<T>

All Superinterfaces
  Serializable

All Known Subinterfaces:
  FilterablePagedResult<T>, ICMPagedResult<T>, SortableFilterablePagedResult<T>, SortablePagedResult<T>

    public interface PagedResult<T>

extends Serializable

Result of some query, organized as pages. Each page consists of some number (usually page size) of beans (T), and is accessed via an Iterator.

It is generally expected that most implementations will be backed by something like database queries, and should be optimized for paganated access. That is, rather than retrieving a full set of results into memory and breaking that into pages, the implementation should retrieve results a page (or a few pages) at a time, and return those via this interface.

The objects contained on the pages should be Java Beans or Strings, since sorting and filtering of these objects is done based on bean properties.

A PagedResult must be Serializable so that it can be stored, for example, in the HttpSession for use across several requests.

See Also
  `SortablePagedResult`, `FilterablePagedResult`, `SortableFilterablePagedResult`

Field Summary
`static int` | `COUNT_UNKNOWN` Represents an unknown count.

Method Summary
`void` | `close()` Close the result and release any resources which it holds.
`int` | `getCurrentPageNumber()` Get the current page number.
`Iterator<T>` | `getPage(int pageNumber)` Get the specified page.
`int` | `getPageCount()` How many pages are available.
`int` | `getPageSize()` Get the size of the pages.
`int` | `getTotalItemCount()` Get the total number of items represented by these pages.
`boolean` | `hasNextPage()` Is there a next page? Will a call to nextPage() succeed?
`boolean` | `hasPage(int pageNumber)` Does the given page exist? Should a call to getPage( pageNumber ) succeed? Generally, this means that getPageNumber() < getPageCount(), but some iterators may not allow random access to all pages, in which case this might return false even when you could get to that page using next/previous.
`boolean` | `hasPreviousPage()` Is there a previous page? Will a call to previousPage() succeed?
`boolean` | `isCompleteResults()` Does this result represent a complete set of results? If not, then probably the maximum number of query results was reached and this iterator only represents a subset of the actual query.
`boolean` | `isGetPageSupported()` Does this iterator allow random access to pages? This method (vs.
`Iterator<T>` | `nextPage()` Get an iterator of the next page full of things.
`Iterator<T>` | `previousPage()` Get an iterator of the previous page full of things.
`void` | `resize(int pageSize)` Set a new page size.

Field Detail

### COUNT_UNKNOWN

    static final int COUNT_UNKNOWN

  Represents an unknown count.

  See Also
    `getTotalItemCount()`, `getPageCount()`, Constants Summary

Method Detail

### getPageSize

    int getPageSize()

  Get the size of the pages. Each call to, for example, nextPage, should return (aproximately) this many items. Do not rely on this number to iterate thru the items, as some pages (like the last page) may have fewer.

### getTotalItemCount

    int getTotalItemCount()

  Get the total number of items represented by these pages. Might return COUNT_UNKNOWN, if the number of items is indeterminant.

### getPageCount

    int getPageCount()

  How many pages are available. Sometimes this might be indeterminent, for example in a large search where the implementation does not know the true size of the result until it reaches the end. In that case, this method should return COUNT_UNKNOWN. If it does return a value, then getPage( getPageCount() - 1 ) must return the last page of results.

### isCompleteResults

    boolean isCompleteResults()

  Does this result represent a complete set of results? If not, then probably the maximum number of query results was reached and this iterator only represents a subset of the actual query.

### getCurrentPageNumber

    int getCurrentPageNumber()

  Get the current page number. This will be the number of the page retrieved by the last call to nextPage, previousPage, or getPage. If none of those methods have yet been called, it should return -1 (because the next page will be page 0, the first page).

### hasNextPage

    boolean hasNextPage()

  Is there a next page? Will a call to nextPage() succeed?

### nextPage

    Iterator<T> nextPage()
                         throws NoSuchElementException

  Get an iterator of the next page full of things.

  Throws
    `NoSuchElementException` - if there is no next page.

### hasPreviousPage

    boolean hasPreviousPage()

  Is there a previous page? Will a call to previousPage() succeed?

### previousPage

    Iterator<T> previousPage()
                             throws NoSuchElementException

  Get an iterator of the previous page full of things.

  Throws
    `NoSuchElementException` - if there is no previous page.

### isGetPageSupported

    boolean isGetPageSupported()

  Does this iterator allow random access to pages? This method (vs. hasPage) can be used by a GUI to decide if presenting a "go to page" button or field is appropriate.

### hasPage

    boolean hasPage(int pageNumber)

  Does the given page exist? Should a call to getPage( pageNumber ) succeed? Generally, this means that getPageNumber() < getPageCount(), but some iterators may not allow random access to all pages, in which case this might return false even when you could get to that page using next/previous.

### getPage

    Iterator<T> getPage(int pageNumber)
                        throws IndexOutOfBoundsException,
                               UnsupportedOperationException

  Get the specified page.

  Throws
    `IndexOutOfBoundsException` - if the pageNumber is negative or is after the last page.
    `UnsupportedOperationException` - if this PageIterator does not support random access of pages (or of that page).

### close

    void close()

  Close the result and release any resources which it holds. Users must call this when finished using this object.

### resize

    void resize(int pageSize)
                throws IllegalArgumentException

  Set a new page size. When a new page size is set, a PageIterator is REQUIRED to reset itself to "before" page one, so that nextPage will then return a new first page with the new sizing.

  Throws
    `IllegalArgumentException` - if pageSize is less than or equal to zero

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