com.sun.msv.verifier.regexp.StringCareLevelCalculator Maven / Gradle / Ivy
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* - Redistributions in binary form must reproduce the above copyright
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
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package com.sun.msv.verifier.regexp;
import com.sun.msv.datatype.xsd.XSDatatype;
import com.sun.msv.grammar.AttributeExp;
import com.sun.msv.grammar.BinaryExp;
import com.sun.msv.grammar.ChoiceExp;
import com.sun.msv.grammar.ConcurExp;
import com.sun.msv.grammar.DataExp;
import com.sun.msv.grammar.ElementExp;
import com.sun.msv.grammar.Expression;
import com.sun.msv.grammar.ExpressionVisitor;
import com.sun.msv.grammar.InterleaveExp;
import com.sun.msv.grammar.ListExp;
import com.sun.msv.grammar.MixedExp;
import com.sun.msv.grammar.OneOrMoreExp;
import com.sun.msv.grammar.OtherExp;
import com.sun.msv.grammar.ReferenceExp;
import com.sun.msv.grammar.SequenceExp;
import com.sun.msv.grammar.ValueExp;
import com.sun.msv.verifier.Acceptor;
/**
* calculates how character literals should be treated.
*
* This class is thread-safe: multiple threads can simultaneously
* access the same instance. Note that there is no guarantee that the
* derived class is thread-safe.
*
* @author Kohsuke KAWAGUCHI
*/
public class StringCareLevelCalculator implements ExpressionVisitor {
protected StringCareLevelCalculator(){}
/** singleton instance. */
protected static final StringCareLevelCalculator theInstance = new StringCareLevelCalculator();
// those expressions which are sensitive about string must return true
public Object onAttribute( AttributeExp exp ) { return NO_STRING; }
public Object onElement( ElementExp exp ) { return NO_STRING; }
public Object onMixed( MixedExp exp ) { return ANY_STRING; }
public Object onList( ListExp exp ) { return SOME_STRING; }
public Object onAnyString() { return ANY_STRING; }
public Object onData( DataExp exp ) {
if(exp.except==Expression.nullSet && exp.dt instanceof XSDatatype) {
XSDatatype xdt = (XSDatatype)exp.dt;
if(xdt.isAlwaysValid())
return ANY_STRING;
}
return SOME_STRING;
}
public Object onValue( ValueExp exp ) { return SOME_STRING; }
public Object onChoice(ChoiceExp exp) {
return doChoice(exp);
}
private Object doChoice(BinaryExp exp) {
Object lhs = exp.exp1.visit(this);
Object rhs = exp.exp2.visit(this);
if(lhs==ANY_STRING && rhs==ANY_STRING) return ANY_STRING;
if(lhs==NO_STRING && rhs==NO_STRING) return NO_STRING;
return SOME_STRING;
}
public Object onOneOrMore(OneOrMoreExp exp) {
return exp.exp.visit(this);
}
public Object onRef(ReferenceExp exp) {
return exp.exp.visit(this);
}
public Object onOther(OtherExp exp) {
return exp.exp.visit(this);
}
public Object onEpsilon() {
return NO_STRING;
}
public Object onNullSet() {
return NO_STRING;
}
public Object onSequence(SequenceExp exp) {
if(!exp.exp1.isEpsilonReducible())
return exp.exp1.visit(this);
else
return doChoice(exp);
}
public Object onConcur(ConcurExp exp) {
Object lhs = exp.exp1.visit(this);
Object rhs = exp.exp2.visit(this);
if(lhs==ANY_STRING && rhs==ANY_STRING) return ANY_STRING;
if(lhs==NO_STRING || rhs==NO_STRING) return NO_STRING;
return SOME_STRING;
}
public Object onInterleave(InterleaveExp p) {
return doChoice(p);
}
public static int calc( Expression exp ) {
Object r = exp.visit(theInstance);
if(r==ANY_STRING)
return Acceptor.STRING_IGNORE;
if(r==NO_STRING)
return Acceptor.STRING_PROHIBITED;
return Acceptor.STRING_STRICT;
}
private static final String ANY_STRING = "anyString";
private static final String NO_STRING = "noString";
private static final String SOME_STRING = "someString";
}