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package com.sun.xml.xsom.util;
import com.sun.xml.xsom.XSType;
/**
* A simple abstraction for a set of Types that defines containment functions.
*
* @author <a href="mailto:Ryan.Shoemaker@Sun.COM">Ryan Shoemaker</a>, Sun Microsystems, Inc.
*/
public abstract class TypeSet {
/**
* Return true if this TypeSet contains the specified type.
*
* Concrete implementations of this method determine what it
* means for the TypeSet to "contain" a type.
*
* @param type the type
* @return true iff this TypeSet contains the specified type
*/
public abstract boolean contains(XSType type);
/**
* Calculate the TypeSet formed by the intersection of two
* other TypeSet objects.
*
* @param a a TypeSet
* @param b another TypeSet
* @return the intersection of a and b
*/
public static TypeSet intersection(final TypeSet a, final TypeSet b) {
return new TypeSet(){
public boolean contains(XSType type) {
return a.contains(type) && b.contains(type);
}
};
}
/**
* Calculate the TypeSet formed by the union of two
* other TypeSet objects.
*
* @param a a TypeSet
* @param b another TypeSet
* @return the union of a and b
*/
public static TypeSet union(final TypeSet a, final TypeSet b) {
return new TypeSet(){
public boolean contains(XSType type) {
return a.contains(type) || b.contains(type);
}
};
}
}