EntityTagProvider.java

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package com.sun.jersey.core.impl.provider.header;

import com.sun.jersey.core.header.reader.HttpHeaderReader;
import com.sun.jersey.core.header.reader.HttpHeaderReader.Event;
import com.sun.jersey.spi.HeaderDelegateProvider;
import java.text.ParseException;
import javax.ws.rs.core.EntityTag;

/**
 *
 * @author Marc.Hadley@Sun.Com
 */
public class EntityTagProvider implements HeaderDelegateProvider<EntityTag> {
    
    public boolean supports(Class<?> type) {
        return type == EntityTag.class;
    }

    public String toString(EntityTag header) {
        StringBuilder b = new StringBuilder();
        if (header.isWeak())
            b.append("W/");
        WriterUtil.appendQuoted(b,header.getValue());
        return b.toString();
    }

    public EntityTag fromString(String header) {
        if (header == null)
            throw new IllegalArgumentException("Entity tag is null");

        try {
            HttpHeaderReader reader = HttpHeaderReader.newInstance(header);
            Event e = reader.next(false);
            if (e == Event.QuotedString) {
                return new EntityTag(reader.getEventValue());
            } else if (e == Event.Token) {
                if (reader.getEventValue().equals("W")) {
                    reader.nextSeparator('/');
                    return new EntityTag(reader.nextQuotedString(), true);
                }
            }
        } catch (ParseException ex) {
            throw new IllegalArgumentException(
                    "Error parsing entity tag '" + header + "'", ex);
        }

        throw new IllegalArgumentException(
                "Error parsing entity tag '" + header + "'");
    }    
}