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package jdk.javadoc.internal.doclets.toolkit.util;

Abstraction for simple relative URIs, consisting of a path, an optional query, and an optional fragment. DocLink objects can be created by the constructors below or from a DocPath using the convenience methods, fragment and query. 
This is NOT part of any supported API.
 If you write code that depends on this, you do so at your own risk.
 This code and its internal interfaces are subject to change or
 deletion without notice.
/**
 * Abstraction for simple relative URIs, consisting of a path,
 * an optional query, and an optional fragment. DocLink objects can
 * be created by the constructors below or from a DocPath using the
 * convenience methods, {@link DocPath#fragment fragment} and
 * {@link DocPath#query query}.
 *
 *  <p><b>This is NOT part of any supported API.
 *  If you write code that depends on this, you do so at your own risk.
 *  This code and its internal interfaces are subject to change or
 *  deletion without notice.</b>
 *
 */
public class DocLink {
    final String path;
    final String query;
    final String fragment;

    
Create a DocLink representing the URI #fragment. /** Create a DocLink representing the URI {@code #fragment}. */
    public static DocLink fragment(String fragment) {
        return new DocLink((String) null, (String) null, fragment);
    }

    
Create a DocLink representing the URI path. /** Create a DocLink representing the URI {@code path}. */
    public DocLink(DocPath path) {
        this(path.getPath(), null, null);
    }

    
Create a DocLink representing the URI path?query#fragment. query and fragment may be null. /**
     * Create a DocLink representing the URI {@code path?query#fragment}.
     * query and fragment may be null.
     */
    public DocLink(DocPath path, String query, String fragment) {
        this(path.getPath(), query, fragment);
    }

    
Create a DocLink representing the URI path?query#fragment. Any of the component parts may be null. /**
     * Create a DocLink representing the URI {@code path?query#fragment}.
     * Any of the component parts may be null.
     */
    public DocLink(String path, String query, String fragment) {
        this.path = path;
        this.query = query;
        this.fragment = fragment;
    }

    
Return the link in the form "path?query#fragment", omitting any empty
components.
/**
     * Return the link in the form "path?query#fragment", omitting any empty
     * components.
     */
    @Override
    public String toString() {
        // common fast path
        if (path != null && isEmpty(query) && isEmpty(fragment))
            return path;

        StringBuilder sb = new StringBuilder();
        if (path != null)
            sb.append(path);
        if (!isEmpty(query))
            sb.append("?").append(query);
        if (!isEmpty(fragment))
            sb.append("#").append(fragment);
        return sb.toString();
    }

    private static boolean isEmpty(String s) {
        return (s == null) || s.isEmpty();
    }
}