DocSet (Solr 4.9.0 API)

All Known Subinterfaces:

DocList

All Known Implementing Classes:

BitDocSet, DocSlice, HashDocSet, SortedIntDocSet
```
public interface DocSet
```
DocSet represents an unordered set of Lucene Document Ids.
WARNING: Any DocSet returned from SolrIndexSearcher should not be modified as it may have been retrieved from a cache and could be shared.

Since:

solr 0.9

Field Summary

Fields
Modifier and Type Field and Description

static DocSet EMPTY

Fields
Modifier and Type	Field and Description
`static DocSet`	`EMPTY`

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`add(int doc)` Adds the specified document if it is not currently in the DocSet (optional operation).
`void`	`addAllTo(DocSet target)` Adds all the docs from this set to the target set.
`void`	`addUnique(int doc)` Adds a document the caller knows is not currently in the DocSet (optional operation).
`DocSet`	`andNot(DocSet other)` Returns the documents in this set that are not in the other set.
`int`	`andNotSize(DocSet other)` Returns the number of documents in this set that are not in the other set.
`boolean`	`exists(int docid)` Returns true if a document is in the DocSet.
`Filter`	`getTopFilter()` Returns a Filter for use in Lucene search methods, assuming this DocSet was generated from the top-level MultiReader that the Lucene search methods will be invoked with.
`DocSet`	`intersection(DocSet other)` Returns the intersection of this set with another set.
`int`	`intersectionSize(DocSet other)` Returns the number of documents of the intersection of this set with another set.
`boolean`	`intersects(DocSet other)` Returns true if these sets have any elements in common
`DocIterator`	`iterator()` Returns an iterator that may be used to iterate over all of the documents in the set.
`long`	`memSize()` Returns the approximate amount of memory taken by this DocSet.
`int`	`size()` Returns the number of documents in the set.
`DocSet`	`union(DocSet other)` Returns the union of this set with another set.
`int`	`unionSize(DocSet other)` Returns the number of documents of the union of this set with another set.

- Field Detail
  - EMPTY
```
static final DocSet EMPTY
```
- Method Detail
  - add
```
void add(int doc)
```
    Adds the specified document if it is not currently in the DocSet (optional operation).
    
    Throws:
    
    SolrException - if the implementation does not allow modifications
    See Also:
    addUnique(int)
  - addUnique
```
void addUnique(int doc)
```
    Adds a document the caller knows is not currently in the DocSet (optional operation).
    This method may be faster then add(doc) in some implementaions provided the caller is certain of the precondition.
    
    Throws:
    
    SolrException - if the implementation does not allow modifications
    See Also:
    add(int)
  - size
```
int size()
```
    Returns the number of documents in the set.
  - exists
```
boolean exists(int docid)
```
    Returns true if a document is in the DocSet.
  - iterator
```
DocIterator iterator()
```
    Returns an iterator that may be used to iterate over all of the documents in the set.
    The order of the documents returned by this iterator is non-deterministic, and any scoring information is meaningless
  - memSize
```
long memSize()
```
    Returns the approximate amount of memory taken by this DocSet. This is only an approximation and doesn't take into account java object overhead.
    
    Returns:
    the approximate memory consumption in bytes
  - intersection
```
DocSet intersection(DocSet other)
```
    Returns the intersection of this set with another set. Neither set is modified - a new DocSet is created and returned.
    
    Returns:
    a DocSet representing the intersection
  - intersectionSize
```
int intersectionSize(DocSet other)
```
    Returns the number of documents of the intersection of this set with another set. May be more efficient than actually creating the intersection and then getting it's size.
  - intersects
```
boolean intersects(DocSet other)
```
    Returns true if these sets have any elements in common
  - union
```
DocSet union(DocSet other)
```
    Returns the union of this set with another set. Neither set is modified - a new DocSet is created and returned.
    
    Returns:
    a DocSet representing the union
  - unionSize
```
int unionSize(DocSet other)
```
    Returns the number of documents of the union of this set with another set. May be more efficient than actually creating the union and then getting it's size.
  - andNot
```
DocSet andNot(DocSet other)
```
    Returns the documents in this set that are not in the other set. Neither set is modified - a new DocSet is created and returned.
    
    Returns:
    a DocSet representing this AND NOT other
  - andNotSize
```
int andNotSize(DocSet other)
```
    Returns the number of documents in this set that are not in the other set.
  - getTopFilter
```
Filter getTopFilter()
```
    Returns a Filter for use in Lucene search methods, assuming this DocSet was generated from the top-level MultiReader that the Lucene search methods will be invoked with.
  - addAllTo
```
void addAllTo(DocSet target)
```
    Adds all the docs from this set to the target set. The target should be sized large enough to accommodate all of the documents before calling this method.

Interface DocSet

Field Summary

Method Summary

Field Detail

EMPTY

Method Detail

add

addUnique

size

exists

iterator

memSize

intersection

intersectionSize

intersects

union

unionSize

andNot

andNotSize

getTopFilter

addAllTo