drools-eclipse/org.guvnor.eclipse.webdav/src/kernel/org/eclipse/webdav/internal/kernel/ConditionFactor.java
public static ConditionFactor create(StreamTokenizer tokenizer) throws WebDAVException {
        boolean not = false;
        ConditionFactor factor = null;
        try {
            int token = tokenizer.ttype;
            if (token == StreamTokenizer.TT_WORD) {
                if (tokenizer.sval.equalsIgnoreCase("Not")) { //$NON-NLS-1$
                    not = true;
                } else {
                    throw new WebDAVException(IResponse.SC_BAD_REQUEST, Policy.bind("error.parseMissingNot")); //$NON-NLS-1$
                }
                token = tokenizer.nextToken();
            }
            switch (token) {
                case '<' :
                    factor = StateToken.create(tokenizer);
                    break;
                case '[' :
                    factor = EntityTag.create(tokenizer);
                    break;
                default :
                    throw new WebDAVException(IResponse.SC_BAD_REQUEST, Policy.bind("error.parseMissingOpen", String.valueOf(token))); //$NON-NLS-1$
            }
        } catch (IOException exc) {
            // ignore or log?
        }
        factor.setNot(not);
        return factor;
    }
public static ConditionFactor create(StreamTokenizer tokenizer) throws WebDAVException {
        boolean not = false;
        ConditionFactor factor = null;
        try {
            int token = tokenizer.ttype;
            if (token == StreamTokenizer.TT_WORD) {
                if (tokenizer.sval.equalsIgnoreCase("Not")) { //$NON-NLS-1$
                    not = true;
                } else {
                    throw new WebDAVException(IResponse.SC_BAD_REQUEST, Policy.bind("error.parseMissingNot")); //$NON-NLS-1$
                }
                token = tokenizer.nextToken();
            }
            switch (token) {
                case '<' :
                    factor = StateToken.create(tokenizer);
                    break;
                case '[' :
                    factor = EntityTag.create(tokenizer);
                    break;
                default :
                    throw new WebDAVException(IResponse.SC_BAD_REQUEST, Policy.bind("error.parseMissingOpen", String.valueOf(token))); //$NON-NLS-1$
            }
        } catch (IOException exc) {
            // ignore or log?
        }
        factor.setNot(not);
        return factor;
    }
Create a ConditionFactor (either a StateToken or EntityTag) by parsing
the tokenizer contining an If header value.

@param tokenizer a StreamTokenizer containing the contents of a state token or entity tag
from a WebDAV If header
@return the parsed ConditionFactor
@exception WebDAVException thrown if there is a syntax error in the If header