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## org.apache.poi.hslf.record
Class PersistPtrHolder

    java.lang.Object
      org.apache.poi.hslf.record.Record
          org.apache.poi.hslf.record.RecordAtom
              org.apache.poi.hslf.record.PositionDependentRecordAtom
                  org.apache.poi.hslf.record.PersistPtrHolder

All Implemented Interfaces:
  PositionDependentRecord

    public final class PersistPtrHolder

extends PositionDependentRecordAtom

General holder for PersistPtrFullBlock and PersistPtrIncrementalBlock records. We need to handle them specially, since we have to go around updating UserEditAtoms if they shuffle about on disk These hold references to where slides "live". If the position of a slide moves, then we have update all of these. If we come up with a new version of a slide, then we have to add one of these to the end of the chain (via CurrentUserAtom and UserEditAtom) pointing to the new slide location

Author:
  Nick Burch

Method Summary
`void` | `addSlideLookup(int slideID, int posOnDisk)` Adds a new slide, notes or similar, to be looked up by this.
`int[]` | `getKnownSlideIDs()` Get the list of slides that this PersistPtrHolder knows about.
`long` | `getRecordType()` Return the value we were given at creation, be it 6001 or 6002
`java.util.Hashtable` | `getSlideLocationsLookup()` Get the lookup from slide numbers to byte offsets, for the slides known about by this PersistPtrHolder.
`java.util.Hashtable` | `getSlideOffsetDataLocationsLookup()` Get the lookup from slide numbers to their offsets inside _ptrData, used when adding or moving slides.
`void` | `updateOtherRecordReferences(java.util.Hashtable oldToNewReferencesLookup)` At write-out time, update the references to the sheets to their new positions
`void` | `writeOut(java.io.OutputStream out)` Write the contents of the record back, so it can be written to disk

Methods inherited from class org.apache.poi.hslf.record.PositionDependentRecordAtom
`getLastOnDiskOffset, setLastOnDiskOffset`

Methods inherited from class org.apache.poi.hslf.record.RecordAtom
`getChildRecords, isAnAtom`

Methods inherited from class org.apache.poi.hslf.record.Record
`buildRecordAtOffset, createRecordForType, findChildRecords, writeLittleEndian, writeLittleEndian`

Methods inherited from class java.lang.Object
`equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Method Detail

### getKnownSlideIDs

    public int[] getKnownSlideIDs()

  Get the list of slides that this PersistPtrHolder knows about. (They will be the keys in the hashtable for looking up the positions of these slides)

### getSlideLocationsLookup

    public java.util.Hashtable getSlideLocationsLookup()

  Get the lookup from slide numbers to byte offsets, for the slides known about by this PersistPtrHolder.

### getSlideOffsetDataLocationsLookup

    public java.util.Hashtable getSlideOffsetDataLocationsLookup()

  Get the lookup from slide numbers to their offsets inside _ptrData, used when adding or moving slides.

### addSlideLookup

    public void addSlideLookup(int slideID,
                               int posOnDisk)

  Adds a new slide, notes or similar, to be looked up by this. For now, won't look for the most optimal on disk representation.

### getRecordType

    public long getRecordType()

  Return the value we were given at creation, be it 6001 or 6002

  Specified by:
    `getRecordType` in class `Record`

### updateOtherRecordReferences

    public void updateOtherRecordReferences(java.util.Hashtable oldToNewReferencesLookup)

  At write-out time, update the references to the sheets to their new positions

  Specified by:
    `updateOtherRecordReferences` in interface `PositionDependentRecord`
  Specified by:
    `updateOtherRecordReferences` in class `PositionDependentRecordAtom`

### writeOut

    public void writeOut(java.io.OutputStream out)
                  throws java.io.IOException

  Write the contents of the record back, so it can be written to disk

  Specified by:
    `writeOut` in class `Record`
  Throws:
    `java.io.IOException`

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