Package java_cup
Class symbol_set
- java.lang.Object
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- java_cup.symbol_set
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public class symbol_set extends java.lang.Object
This class represents a set of symbols and provides a series of set operations to manipulate them.- Version:
- last updated: 11/25/95
- Author:
- Scott Hudson
- See Also:
symbol
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Field Summary
Fields Modifier and Type Field Description protected java.util.Hashtable
_all
A hash table to hold the set.
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Constructor Summary
Constructors Constructor Description symbol_set()
Constructor for an empty set.symbol_set(symbol_set other)
Constructor for cloning from another set.
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description boolean
add(symbol sym)
Add a single symbol to the set.boolean
add(symbol_set other)
Add (union) in a complete set.java.util.Enumeration
all()
Access to all elements of the set.boolean
contains(symbol sym)
Determine if the set contains a particular symbol.boolean
equals(symbol_set other)
Equality comparison.boolean
equals(java.lang.Object other)
Generic equality comparison.int
hashCode()
Compute a hash code.boolean
is_subset_of(symbol_set other)
Determine if this set is an (improper) subset of another.boolean
is_superset_of(symbol_set other)
Determine if this set is an (improper) superset of another.protected void
not_null(java.lang.Object obj)
Helper function to test for a null object and throw an exception if one is found.void
remove(symbol sym)
Remove a single symbol if it is in the set.void
remove(symbol_set other)
Remove (set subtract) a complete set.int
size()
size of the setjava.lang.String
toString()
Convert to a string.
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Constructor Detail
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symbol_set
public symbol_set()
Constructor for an empty set.
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symbol_set
public symbol_set(symbol_set other) throws internal_error
Constructor for cloning from another set.- Parameters:
other
- the set we are cloning from.- Throws:
internal_error
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Method Detail
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all
public java.util.Enumeration all()
Access to all elements of the set.
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size
public int size()
size of the set
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not_null
protected void not_null(java.lang.Object obj) throws internal_error
Helper function to test for a null object and throw an exception if one is found.- Parameters:
obj
- the object we are testing.- Throws:
internal_error
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contains
public boolean contains(symbol sym)
Determine if the set contains a particular symbol.- Parameters:
sym
- the symbol we are looking for.
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is_subset_of
public boolean is_subset_of(symbol_set other) throws internal_error
Determine if this set is an (improper) subset of another.- Parameters:
other
- the set we are testing against.- Throws:
internal_error
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is_superset_of
public boolean is_superset_of(symbol_set other) throws internal_error
Determine if this set is an (improper) superset of another.- Parameters:
other
- the set we are are testing against.- Throws:
internal_error
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add
public boolean add(symbol sym) throws internal_error
Add a single symbol to the set.- Parameters:
sym
- the symbol we are adding.- Returns:
- true if this changes the set.
- Throws:
internal_error
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remove
public void remove(symbol sym) throws internal_error
Remove a single symbol if it is in the set.- Parameters:
sym
- the symbol we are removing.- Throws:
internal_error
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add
public boolean add(symbol_set other) throws internal_error
Add (union) in a complete set.- Parameters:
other
- the set we are adding in.- Returns:
- true if this changes the set.
- Throws:
internal_error
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remove
public void remove(symbol_set other) throws internal_error
Remove (set subtract) a complete set.- Parameters:
other
- the set we are removing.- Throws:
internal_error
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equals
public boolean equals(symbol_set other)
Equality comparison.
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equals
public boolean equals(java.lang.Object other)
Generic equality comparison.- Overrides:
equals
in classjava.lang.Object
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hashCode
public int hashCode()
Compute a hash code.- Overrides:
hashCode
in classjava.lang.Object
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toString
public java.lang.String toString()
Convert to a string.- Overrides:
toString
in classjava.lang.Object
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