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Jersey core server implementation
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 *
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 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
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 * or LICENSE.txt.  See the License for the specific
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package org.glassfish.jersey.server.internal.routing;

import java.util.regex.MatchResult;

/**
 * {@link MatchResult} implementation that returns the nested string as a
 * single matching result. This match result mimics matching of a single
 * matching group with group index 0 (the one containing the whole expression).
 *
 * @author Paul Sandoz
 * @author Marek Potociar (marek.potociar at oracle.com)
 */
final class SingleMatchResult implements MatchResult {

    private final String path;

    /**
     * Construct a match result matching the whole supplied path.
     *
     * @param path matched path.
     */
    public SingleMatchResult(final String path) {
        this.path = stripMatrixParams(path);
    }

    /**
     * Strip the matrix parameters from a path.
     *
     * @return path stripped of matrix parameters.
     */
    private static String stripMatrixParams(final String path) {
        int e = path.indexOf(';');
        if (e == -1) {
            return path;
        }

        int s = 0;
        StringBuilder sb = new StringBuilder();
        do {
            // Append everything up to but not including the ';'
            sb.append(path, s, e);

            // Skip everything up to but not including the '/'
            s = path.indexOf('/', e + 1);
            if (s == -1) {
                break;
            }
            e = path.indexOf(';', s);
        } while (e != -1);

        if (s != -1) {
            // Append any remaining characters
            sb.append(path, s, path.length());
        }

        return sb.toString();
    }


    @Override
    public int start() {
        return 0;
    }

    @Override
    public int start(final int group) {
        if (group == 0) {
            return start();
        }
        throw new IndexOutOfBoundsException();
    }

    @Override
    public int end() {
        return path.length();
    }

    @Override
    public int end(final int group) {
        if (group == 0) {
            return end();
        }
        throw new IndexOutOfBoundsException();
    }

    @Override
    public String group() {
        return path;
    }

    @Override
    public String group(final int group) {
        if (group == 0) {
            return group();
        }
        throw new IndexOutOfBoundsException();
    }

    @Override
    public int groupCount() {
        return 0;
    }
}