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Oracle® Coherence Java API Reference
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## com.tangosol.util
Class SafeSortedMap.Split

    java.lang.Object
      com.tangosol.util.SafeSortedMap.Split

Enclosing class:
  SafeSortedMap

    public class SafeSortedMap.Split

extends java.lang.Object

Split encapsulates the headMap and tailMap of the SafeSortedMap at a given split-key and could be used as an optimization facility when both head and tail portions of the SortedMap are needed.

Field Summary
`protected float` | `m_flHeadWeight` The estimated weight of the head portion of the split, expressed as a ratio of the size of the headMap to the size of the underlying SafeSortedMap.
`protected java.util.SortedMap` | `m_mapHead` The headMap.
`protected java.util.SortedMap` | `m_mapTail` The tailMap.

Constructor Summary
`protected` | `SafeSortedMap.Split(java.lang.Object oKey)` Construct a split at the specified key.

Method Summary
`protected float` | `calculateHeadWeight()` Estimate the weight of the head portion of the Split.
`java.util.SortedMap` | `getHead()` Return front of the split.
`float` | `getHeadWeight()` Return the estimated weight of the head portion of the `SafeSortedMap.Split`.
`java.lang.Object` | `getSplitKey()` Return the key around which this is `SafeSortedMap.Split` is defined.
`java.util.SortedMap` | `getTail()` Return the part of the split
`float` | `getTailWeight()` Return the estimated weight of the tail portion of the `SafeSortedMap.Split`.
`boolean` | `isHeadHeavy()` Return true if the estimated weight of the head of the split is larger than the tail.
`protected int` | `quickLog(int n, int nBase)` Calculate and return the floor of `lognBase(n)`.

Field Detail

### m_mapHead

    protected java.util.SortedMap m_mapHead

  The headMap.

### m_mapTail

    protected java.util.SortedMap m_mapTail

  The tailMap.

### m_flHeadWeight

    protected float m_flHeadWeight

  The estimated weight of the head portion of the split, expressed as a ratio of the size of the headMap to the size of the underlying SafeSortedMap.

Constructor Detail

### SafeSortedMap.Split

    protected SafeSortedMap.Split(java.lang.Object oKey)

  Construct a split at the specified key.

  Parameters:
    `oKey` - the key at which to split

Method Detail

### quickLog

    protected int quickLog(int n,
                           int nBase)

  Calculate and return the floor of `lognBase(n)`.

  Returns:
    the floor of `lognBase(n)`

### calculateHeadWeight

    protected float calculateHeadWeight()

  Estimate the weight of the head portion of the Split. The weight is expressed as a ratio of the size of the headMap to the size of the underlying SafeSortedMap.

  Returns:
    the estimated weight of the head portion of the Split

### getHead

    public java.util.SortedMap getHead()

  Return front of the split. This is a SortedMap view of

  Returns:
    the

### getTail

    public java.util.SortedMap getTail()

  Return the part of the split

### getHeadWeight

    public float getHeadWeight()

  Return the estimated weight of the head portion of the `SafeSortedMap.Split`. The weight is expressed as a ratio of the size of the headMap to the size of the underlying SafeSortedMap.

  Note: this method is not guaranteed to return an exact answer, but rather uses a heuristic to make an estimate. For an exact answer, the more expensive size() methods should be used.

### getTailWeight

    public float getTailWeight()

  Return the estimated weight of the tail portion of the `SafeSortedMap.Split`. The weight is expressed as a ratio of the size of the tailMap to the size of the underlying SafeSortedMap.

  Note: this method is not guaranteed to return an exact answer, but rather uses a heuristic to make an estimate. For an exact answer, the more expensive size() methods should be used.

### isHeadHeavy

    public boolean isHeadHeavy()

  Return true if the estimated weight of the head of the split is larger than the tail.

  Returns:
    true iff the estimated weight of the head of the split is larger than the tail
  See Also:
    `getHeadWeight()`

### getSplitKey

    public java.lang.Object getSplitKey()

  Return the key around which this is `SafeSortedMap.Split` is defined.

  Returns:
    the key around which this is `SafeSortedMap.Split` is defined

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Oracle® Coherence Java API Reference
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