MatchingEntityTag.java

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package com.sun.jersey.core.header;

import com.sun.jersey.core.header.reader.HttpHeaderReader;
import com.sun.jersey.core.header.reader.HttpHeaderReader.Event;
import java.text.ParseException;
import java.util.Collections;
import java.util.Set;
import javax.ws.rs.core.EntityTag;

/**
 * A matching entity tag.
 * <p>
 * Note that this type and it's super type cannot be used to create request
 * header values for <code>If-Match</code> and <code>If-None-Match</code>
 * of the form <code>If-Match: *</code> or <code>If-None-Match: *</code> as
 * <code>*</code> is not a valid entity tag.
 *
 * @author Paul.Sandoz@Sun.Com
 */
public class MatchingEntityTag extends EntityTag {

    /**
     * An empty set that corresponds to <code>If-Match: *</code> or
     * <code>If-None-Match: *</code>.
     */
    public static final Set<MatchingEntityTag> ANY_MATCH = Collections.emptySet();

    public MatchingEntityTag(String value) {
        super(value, false);
    }

    public MatchingEntityTag(String value, boolean weak) {
        super(value, weak);
    }
    
    public static MatchingEntityTag valueOf(HttpHeaderReader reader) throws ParseException {
        Event e = reader.next(false);
        if (e == Event.QuotedString) {
            return new MatchingEntityTag(reader.getEventValue());
        } else if (e == Event.Token) {
            String v = reader.getEventValue();
            if (v.equals("W")) {
                reader.nextSeparator('/');
                return new MatchingEntityTag(reader.nextQuotedString(), true);
            }
        }

        throw new ParseException("Error parsing entity tag", reader.getIndex());
    }
}