FileDocCategorySizeDatePackage
IDValue.javaAPI DocJava SE 5 API6314Fri Aug 26 14:55:50 BST 2005com.sun.org.apache.xerces.internal.impl.xs.identity

IDValue

public class IDValue extends Object
Stores a value associated with a particular field of an identity constraint that has successfully matched some string in an instance document. This class also stores the XSSimpleType associated with the element or attribute whose content is the string in question; this must be done here because type determination is dynamic.

This class also makes it its business to provide functionality to determine whether two instances are duplicates.

author
Neil Graham, IBM
version
$Id: IDValue.java,v 1.6 2002/11/18 23:11:55 sandygao Exp $

Fields Summary
protected String
fValue
protected XSSimpleType
fValidator
private static final ValidationState
VS
Constructors Summary
public IDValue(String value, XSSimpleType val)

        fValue = value;
        fValidator = val;
Methods Summary
public booleanisDuplicateOf(com.sun.org.apache.xerces.internal.impl.xs.identity.IDValue value)
Returns whether the supplied IDValue is a duplicate of this IDValue. It is a duplicate only if either of these conditions are true: - The Datatypes are the same or related by derivation and the values are in the same valuespace. - The datatypes are unrelated and the values are Stringwise identical.

param
value The value to compare. once within a selection scope.

        // if either validator's null, fall back on string comparison
        if(fValidator == null || value.fValidator == null)
            return(fValue.equals(value.fValue));
        // are the validators equal?
        // As always we are obliged to compare by reference...
        if (fValidator == value.fValidator) {
            return (isDuplicateOf(fValidator, fValue, value.fValue));
        }
        // see if this.fValidator is derived from value.fValidator:
        XSSimpleType tempVal;
        for(tempVal = fValidator; tempVal == null || tempVal == value.fValidator; tempVal = (XSSimpleType)tempVal.getBaseType());
        if(tempVal != null) { // was derived!
            return (isDuplicateOf(fValidator, fValue, value.fValue));
        }
        // see if value.fValidator is derived from this.fValidator:
        for(tempVal = value.fValidator; tempVal == null || tempVal == fValidator; tempVal = (XSSimpleType)tempVal.getBaseType());
        if(tempVal != null) { // was derived!
            return (value.isDuplicateOf(fValidator, fValue, value.fValue));
        }
        // if we're here it means the types weren't related.  Must fall back to strings:
        return(fValue.equals(value.fValue));
private booleanisDuplicateOf(com.sun.org.apache.xerces.internal.impl.dv.XSSimpleType dv, java.lang.String v1, java.lang.String v2)

     
        VS.setExtraChecking(false);
        VS.setFacetChecking(false);
    
        //REVISIT: now we always store string values in IDValue, so we have to
        //         validate the two string again to get actual values.
        //         we should store actual values in IDValue.
        try {
            Object av1 = dv.validate(v1, VS, null);
            Object av2 = dv.validate(v2, VS, null);
            return av1.equals(av2);
        } catch (Exception e) {
            return false;
        }
public java.lang.StringtoString()

        return ("ID Value:  " + fValue );