Module org.apache.jena.arq
Package org.apache.jena.sparql.util

Class Context

java.lang.Object
org.apache.jena.sparql.util.Context
public class Context extends Object
A class for setting and keeping named values. Used to pass implementation-specific parameters across general interfaces.

  • Constructor Details

    • Context

      public Context()
      Create an empty context

  • Method Details

    • emptyContext

      public static final Context emptyContext()
      Empty, immutable context

    • create

      public static Context create()
      Create an empty context

    • copy

      public Context copy()
      Return a copy of this context. Modifications of the copy do not affect the original context.

    • get

      public <T> T get(Symbol property)
      Get the object value of a property or null

    • get

      public <T> T get(Symbol property, T defaultValue)
      Get the object value of a property - return the default value if not present .

    • put

      public void put(Symbol property, Object value)
      Store a named value - overwrites any previous set value.

    • set

      public Context set(Symbol property, Object value)
      Store a named value - overwrites any previous set value. Returns "this".

    • set

      public Context set(Symbol property, boolean value)
      Store a named value - overwrites any previous set value. Returns "this".

    • setIfUndef

      public Context setIfUndef(Symbol property, Object value)
      Store a named value only if it is not currently set. Returns "this".

    • setTrue

      public Context setTrue(Symbol property)
      Set property value to be true. Returns "this".

    • setFalse

      public Context setFalse(Symbol property)
      Set property value to be false. Returns "this".

    • setAll

      public Context setAll(Context other)

    • putAll

      public void putAll(Context other)

    • remove

      public void remove(Symbol property)
      Remove any value associated with a property

    • unset

      public Context unset(Symbol property)
      Remove any value associated with a property. Returns "this".

    • isDefined

      public boolean isDefined(Symbol property)
      Is a property set?

    • isUndef

      public boolean isUndef(Symbol property)
      Is a property not set?

    • getAsString

      public String getAsString(Symbol property, String defaultValue)
      Get the value a string (uses .toString() if the value is not null) - supply a default string value

    • getAsString

      public String getAsString(Symbol property)
      Get the value a string (uses .toString() if the value is not null)

    • getInt

      public int getInt(Symbol symbol, int defaultValue)
      Get the value as a long value. The context entry can be a string, Integer or Long.

    • getLong

      public long getLong(Symbol symbol, long defaultValue)
      Get the value as a long value. The context entry can be a string, Integer or Long.

    • isTrue

      public boolean isTrue(Symbol property)
      Is the value 'true' (either set to the string "true" or Boolean.TRUE)

    • isTrueOrUndef

      public boolean isTrueOrUndef(Symbol property)
      Is the value 'true' (either set to the string "true" or Boolean.TRUE) or undefined?

    • isFalse

      public boolean isFalse(Symbol property)
      Is the value 'false' (either set to the string "false" or Boolean.FALSE)

    • isFalseOrUndef

      public boolean isFalseOrUndef(Symbol property)
      Is the value 'false' (either set to the string "false" or Boolean.FALSE) or undefined

    • getTrueOrFalse

      public Boolean getTrueOrFalse(Symbol property)
      Is the value true or false, either as a Boolean or a string. If undefined, return null. Exception if not a boolean or a string.

    • hasValue

      public boolean hasValue(Symbol property, Object value)
      Test whether a named value is a specific value (.equals)

    • hasValueAsString

      public boolean hasValueAsString(Symbol property, String value)
      Test whether a named value (as a string) has a specific string form

    • hasValueAsString

      public boolean hasValueAsString(Symbol property, String value, boolean ignoreCase)
      Test whether a named value (as a string) has a specific string form - can ignore case

    • keys

      public Set<Symbol> keys()
      Set of properties (as Symbols) currently defined

    • size

      public int size()
      Return the number of context items

    • clear

      public void clear()

    • toString

      public String toString()
      Overrides:
      toString in class Object

    • fromDataset

      public static Context fromDataset(DatasetGraph dataset)
      Return the context of the dataset (not copied); if the dataset is null, return null

    • setupContextForDataset

      public static Context setupContextForDataset(Context globalContext, DatasetGraph dataset)
      Setup a context using another context and a dataset.

    • setCurrentDateTime

      public static void setCurrentDateTime(Context context)

    • getCancelSignal

      public static AtomicBoolean getCancelSignal(Context context)

    • compute

      public <V> V compute(Symbol key, BiFunction<Symbol,Object,? extends V> remappingFunction)
      Atomic compute.

    • computeIfAbsent

      public <V> V computeIfAbsent(Symbol key, Function<Symbol,? extends V> mappingFunction)
      Atomic computeIfAbsent.

    • computeIfPresent

      public <V> V computeIfPresent(Symbol key, BiFunction<Symbol,Object,V> remappingFunction)
      Atomic computeIfPresent.

    • getOrSetCancelSignal

      public static AtomicBoolean getOrSetCancelSignal(Context context)
      Get the context's cancel signal. Create and set one if needed. Context must not be null.

    • mergeCopy

      public static Context mergeCopy(Context contextGlobal, Context contextLocal)
      Merge an outer (defaults to the system global context) and local context to produce a new context The new context is always a separate copy.

    • hashCode

      public int hashCode()
      Overrides:
      hashCode in class Object

    • equals

      public boolean equals(Object obj)
      Overrides:
      equals in class Object