org.glassfish.jersey.message.internal.LinkProvider Maven / Gradle / Ivy

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 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
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package org.glassfish.jersey.message.internal;

import java.util.List;
import java.util.Map;
import java.util.StringTokenizer;
import javax.ws.rs.core.Link;
import javax.ws.rs.core.Link.Builder;
import javax.ws.rs.core.MultivaluedMap;
import org.glassfish.jersey.spi.HeaderDelegateProvider;

/**
 * Provider for Link Headers.
 *
 * @author Santiago Pericas-Geertsen
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
public class LinkProvider implements HeaderDelegateProvider {

    @Override
    public boolean supports(Class type) {
        return Link.class.isAssignableFrom(type);
    }

    @Override
    public Link fromString(String value) throws IllegalArgumentException {
        Builder lb;
        StringTokenizer st = new StringTokenizer(value.trim(), "<>;=\"", true);
        try {
            checkToken(st, "<");
            lb = Link.fromUri(st.nextToken().trim());
            checkToken(st, ">");
            while (st.hasMoreTokens()) {
                checkToken(st, ";");
                String n = st.nextToken().trim();
                checkToken(st, "=");
                checkToken(st, "\"");
                String v = st.nextToken();
                checkToken(st, "\"");
                lb.param(n, v);
            }
        } catch (Throwable e) {
            lb = null;
        }
        if (lb == null) {
            throw new IllegalArgumentException("Unable to parse link " + value);
        }
        return lb.build();
    }

    private void checkToken(StringTokenizer st, String expected) throws AssertionError {
        String token;
        do {
            token = st.nextToken().trim();
        } while (token.length() == 0);
        if (!token.equals(expected)) {
            throw new AssertionError("Expected token " + expected + " but found " + token);
        }
    }

    @Override
    public String toString(Link value) {
        MultivaluedMap map = value.getParams();
        StringBuilder sb = new StringBuilder();
        sb.append('<').append(value.getUri()).append('>');

        for (Map.Entry> entry : map.entrySet()) {
            sb.append("; ").append(entry.getKey()).append("=\"");
            boolean first = true;
            for (String v : entry.getValue()) {
                sb.append(first ? "" : " ");
                sb.append(v);
                first = false;
            }
            sb.append("\"");
        }
        return sb.toString();
    }
}