Package it.unimi.dsi.sux4j.mph
Class GOVMinimalPerfectHashFunction.Builder<T>
- java.lang.Object
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- it.unimi.dsi.sux4j.mph.GOVMinimalPerfectHashFunction.Builder<T>
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- Enclosing class:
- GOVMinimalPerfectHashFunction<T>
public static class GOVMinimalPerfectHashFunction.Builder<T> extends java.lang.Object
A builder class forGOVMinimalPerfectHashFunction
.
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Field Summary
Fields Modifier and Type Field Description protected BucketedHashStore<T>
bucketedHashStore
protected boolean
built
Whetherbuild()
has already been called.protected java.lang.Iterable<? extends T>
keys
protected int
signatureWidth
protected java.io.File
tempDir
protected it.unimi.dsi.bits.TransformationStrategy<? super T>
transform
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Constructor Summary
Constructors Constructor Description Builder()
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description GOVMinimalPerfectHashFunction<T>
build()
Builds a minimal perfect hash function.GOVMinimalPerfectHashFunction.Builder<T>
keys(java.lang.Iterable<? extends T> keys)
Specifies the keys to hash; if you have specified aBucketedHashStore
, it can benull
.GOVMinimalPerfectHashFunction.Builder<T>
signed(int signatureWidth)
Specifies that the resultingGOVMinimalPerfectHashFunction
should be signed using a given number of bits per key.GOVMinimalPerfectHashFunction.Builder<T>
store(BucketedHashStore<T> bucketedHashStore)
Specifies a bucketed hash store containing the keys.GOVMinimalPerfectHashFunction.Builder<T>
tempDir(java.io.File tempDir)
Specifies a temporary directory for theBucketedHashStore
.GOVMinimalPerfectHashFunction.Builder<T>
transform(it.unimi.dsi.bits.TransformationStrategy<? super T> transform)
Specifies the transformation strategy for the keys to hash.
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Field Detail
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keys
protected java.lang.Iterable<? extends T> keys
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transform
protected it.unimi.dsi.bits.TransformationStrategy<? super T> transform
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signatureWidth
protected int signatureWidth
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tempDir
protected java.io.File tempDir
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bucketedHashStore
protected BucketedHashStore<T> bucketedHashStore
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built
protected boolean built
Whetherbuild()
has already been called.
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Method Detail
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keys
public GOVMinimalPerfectHashFunction.Builder<T> keys(java.lang.Iterable<? extends T> keys)
Specifies the keys to hash; if you have specified aBucketedHashStore
, it can benull
.- Parameters:
keys
- the keys to hash.- Returns:
- this builder.
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transform
public GOVMinimalPerfectHashFunction.Builder<T> transform(it.unimi.dsi.bits.TransformationStrategy<? super T> transform)
Specifies the transformation strategy for the keys to hash.- Parameters:
transform
- a transformation strategy for the keys to hash.- Returns:
- this builder.
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signed
public GOVMinimalPerfectHashFunction.Builder<T> signed(int signatureWidth)
Specifies that the resultingGOVMinimalPerfectHashFunction
should be signed using a given number of bits per key.- Parameters:
signatureWidth
- a signature width, or 0 for no signature.- Returns:
- this builder.
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tempDir
public GOVMinimalPerfectHashFunction.Builder<T> tempDir(java.io.File tempDir)
Specifies a temporary directory for theBucketedHashStore
.- Parameters:
tempDir
- a temporary directory for theBucketedHashStore
files, ornull
for the standard temporary directory.- Returns:
- this builder.
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store
public GOVMinimalPerfectHashFunction.Builder<T> store(BucketedHashStore<T> bucketedHashStore)
Specifies a bucketed hash store containing the keys.
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build
public GOVMinimalPerfectHashFunction<T> build() throws java.io.IOException
Builds a minimal perfect hash function.- Returns:
- a
GOVMinimalPerfectHashFunction
instance with the specified parameters. - Throws:
java.lang.IllegalStateException
- if called more than once.java.io.IOException
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