com.sun.msv.grammar.xmlschema.OccurrenceExp Maven / Gradle / Ivy
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package com.sun.msv.grammar.xmlschema;
import com.sun.msv.grammar.Expression;
import com.sun.msv.grammar.OtherExp;
/**
* Used to mark a occurrence constraint which cannot
* be easily represented by primitive expressions.
*
*
* This expression is just a marker, and the exp field
* of this instance still contains the precise expression
* of the occurrence constraint.
*
*
* For example, if A is maxOccurs=5 and minOccurs=3,
* then the exp field of this instance will be:
* A,A,A,(A,A?)?, the maxOccurs field
* will be 5, the minOccurs field will be 3, and
* the itemExp field will hold a reference to A.
*
*
* Note that MSV doesn't using this marker by itself.
* It is intended to help other applications that use
* the AGM of MSV.
*
*
* Also note that this expression will not
* be used in the following cases to avoid excessive allocation
* of this expression:
*
*
* - when maxOccurs=unbounded and minOccurs is 1 or 0
*
- when maxOccurs=1
*
*
*
* Those cases can be expressed quite nicely with existing primitives
* So the client shouldn't find it difficuult to process them.
* I appreciate any feedback on this issue.
*
* @author
* Kohsuke Kawaguchi ([email protected])
*/
public class OccurrenceExp extends OtherExp {
public OccurrenceExp(
Expression preciseExp,
int maxOccurs, int minOccurs, Expression itemExp ) {
super(preciseExp);
this.maxOccurs = maxOccurs;
this.minOccurs = minOccurs;
this.itemExp = itemExp;
}
/** Maximum occurence. -1 to indicate "unbounded" */
public final int maxOccurs;
/** Minimum occurence. */
public final int minOccurs;
/** The unit of repetition. */
public final Expression itemExp;
/** Obtains a string representation suitable for quick debugging. */
public String toString() {
return itemExp.toString()+"["+minOccurs+","+
(maxOccurs==-1?"inf":String.valueOf(maxOccurs))+"]";
}
// serialization support
private static final long serialVersionUID = 1;
}