Package htsjdk.samtools.util
Class CollectionUtil
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- htsjdk.samtools.util.CollectionUtil
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public class CollectionUtil extends Object
Small utility methods for dealing with collection classes.
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Nested Class Summary
Nested Classes Modifier and Type Class Description static class
CollectionUtil.DefaultingMap<K,V>
A defaulting map, which returns a default value when a value that does not exist in the map is looked up.static class
CollectionUtil.MultiMap<K,V>
Simple multi-map for convenience of storing collections in map values.static class
CollectionUtil.Partitioner<V,K>
Deprecated.use Collectors.groupingBy instead
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Field Summary
Fields Modifier and Type Field Description static Comparator<Object>
OBJECT_TOSTRING_COMPARATOR
Simple case-insensitive lexical comparator of objects using theirObject.toString()
value.
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Constructor Summary
Constructors Constructor Description CollectionUtil()
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Method Summary
All Methods Static Methods Concrete Methods Deprecated Methods Modifier and Type Method Description static <T> T
getSoleElement(Collection<T> items)
static String
join(Collection<?> items, String inBetween)
Construct a string by toString()ing each item in the collection with inBetween between each item.static <T> Collection<T>
makeCollection(Iterator<T> i)
static <T> List<T>
makeList(T... list)
static <T> Set<T>
makeSet(T... list)
static <K,V>
Map<K,Collection<V>>partition(Collection<V> collection, CollectionUtil.Partitioner<V,K> p)
Deprecated.use java8 .stream().collect(Collectors.groupingBy(()-> function)) insteadstatic <K,V>
Map<K,Collection<V>>partition(Collection<V> collection, Function<? super V,? extends K> keyer)
Partitions a collection into groups based on a characteristics of that group.
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Field Detail
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OBJECT_TOSTRING_COMPARATOR
public static final Comparator<Object> OBJECT_TOSTRING_COMPARATOR
Simple case-insensitive lexical comparator of objects using theirObject.toString()
value.
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Method Detail
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makeList
public static <T> List<T> makeList(T... list)
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makeSet
public static <T> Set<T> makeSet(T... list)
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makeCollection
public static <T> Collection<T> makeCollection(Iterator<T> i)
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join
public static String join(Collection<?> items, String inBetween)
Construct a string by toString()ing each item in the collection with inBetween between each item.
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getSoleElement
public static <T> T getSoleElement(Collection<T> items)
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partition
@Deprecated public static <K,V> Map<K,Collection<V>> partition(Collection<V> collection, CollectionUtil.Partitioner<V,K> p)
Deprecated.use java8 .stream().collect(Collectors.groupingBy(()-> function)) insteadPartitions a collection into groups based on a characteristics of that group. Partitions are embodied in a map, whose keys are the value of that characteristic, and the values are the partition of elements whose characteristic evaluate to that key.
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partition
public static <K,V> Map<K,Collection<V>> partition(Collection<V> collection, Function<? super V,? extends K> keyer)
Partitions a collection into groups based on a characteristics of that group. Partitions are embodied in a map, whose keys are the value of that characteristic, and the values are the partition of elements whose characteristic evaluate to that key.
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