taglibraryinfo.java

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/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 1999 The Apache Software Foundation.  All rights 
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:  
 *       "This product includes software developed by the 
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
 *
 * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
 *    Foundation" must not be used to endorse or promote products derived
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 * 5. Products derived from this software may not be called "Apache"
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 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
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 */ 
 
package javax.servlet.jsp.tagext;

import javax.servlet.jsp.tagext.TagInfo;

import java.net.URL;

import java.io.InputStream;

/**
 * Information on the Tag Library;
 * this class is instantiated from the Tag Library Descriptor file (TLD).
 */

abstract public class TagLibraryInfo {

    /**
     * Constructor
     *
     * This will invoke the constructors for TagInfo, and TagAttributeInfo
     * after parsing the TLD file.
     *
     * @param prefix the prefix actually used by the taglib directive
     * @param uri the URI actually used by the taglib directive
     */

    protected TagLibraryInfo(String prefix, String uri) {
	this.prefix = prefix;
	this.uri    = uri;
    }

    // TODO -- want a package private constructor with data spelled out?

    /**
     * @return the URI from the <%@ taglib directive for this library
     */
   
    public String getURI() {
        return uri;
    }

    /**
     * @return the prefix assigned to this taglib from the <%taglib directive
     */

    public String getPrefixString() {
	return prefix;
    }

    // ==== methods using the TLD data =======

    /**
     * @return the prefered short name for the library
     */
    public String getShortName() {
        return shortname;
    }

    /**
     * @return a reliable URN to a TLD like this
     */
    public String getReliableURN() {
        return urn;
    }

    /**
     * @return the info string for this tag lib
     */
   
    public String getInfoString() {
        return info;
    }

    /**
     * The required version.
     * TODO -- minimal?
     */
   
    public String getRequiredVersion() {
        return jspversion;
    }

    /**
     * @return the tags defined in this tag lib
     */
   
    public TagInfo[] getTags() {
        return tags;
    }

    /**
     * Get the TagInfo for a given tag name
     */

    public TagInfo getTag(String shortname) {
        TagInfo tags[] = getTags();

        if (tags == null || tags.length == 0) {
            System.err.println("No tags");
            return null;
        }

        for (int i=0; i < tags.length; i++) {
            if (tags[i].getTagName().equals(shortname)) {
                return tags[i];
            }
        }
        return null;
    }


    // Protected fields

    protected String        prefix;
    protected String        uri;

    protected TagInfo[]     tags;

    // Tag Library Data
    protected String tlibversion; // required
    protected String jspversion;  // optional
    protected String shortname;   // required
    protected String urn;         // required
    protected String info;        // optional
}