taglibraryinfoimpl.java

低版本的tomcat 对于有些老版本的应用还真的需要老版的中间件

/*
 * $Header: /home/cvs/jakarta-tomcat/src/share/org/apache/jasper/compiler/TagLibraryInfoImpl.java,v 1.22.2.8 2001/01/05 09:26:07 jiricka Exp $
 * $Revision: 1.22.2.8 $
 * $Date: 2001/01/05 09:26:07 $
 *
 * 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
 *    from this software without prior written permission. For written 
 *    permission, please contact [e-mail].
 *
 * 5. Products derived from this software may not be called "Apache"
 *    nor may "Apache" appear in their names without prior written
 *    permission of the Apache Group.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation.  For more
 * information on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 *
 */ 

package org.apache.jasper.compiler;

import java.net.URL;
import java.util.zip.ZipInputStream;
import java.util.zip.ZipEntry;
import java.io.ByteArrayOutputStream;
import java.io.ByteArrayInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.IOException;
import java.io.File;
import java.io.FileNotFoundException;
import java.util.Vector;
import java.util.Hashtable;

import javax.servlet.jsp.tagext.TagLibraryInfo;
import javax.servlet.jsp.tagext.TagInfo;
import javax.servlet.jsp.tagext.TagAttributeInfo;
import javax.servlet.jsp.tagext.TagExtraInfo;

import org.w3c.dom.*;
import org.xml.sax.*;

import org.apache.jasper.JspCompilationContext;
import org.apache.jasper.JasperException;
import org.apache.jasper.Constants;
//import org.apache.jasper.runtime.JspLoader;

import org.apache.tomcat.logging.Logger;

/**
 * Implementation of the TagLibraryInfo class from the JSP spec. 
 *
 * @author Anil K. Vijendran
 * @author Mandar Raje
 */
public class TagLibraryInfoImpl extends TagLibraryInfo {
    static private final String TLD = "META-INF/taglib.tld";
    static private final String WEBAPP_INF = "/WEB-INF/web.xml";

    Document tld;

    Hashtable jarEntries;

    JspCompilationContext ctxt;

    

    private final void print(String name, String value, PrintWriter w) {
        if (value != null) {
            w.print(name+" = {\n\t");
            w.print(value);
            w.print("\n}\n");
        }
    }

    public String toString() {
        StringWriter sw = new StringWriter();
        PrintWriter out = new PrintWriter(sw);
        print("tlibversion", tlibversion, out);
        print("jspversion", jspversion, out);
        print("shortname", shortname, out);
        print("urn", urn, out);
        print("info", info, out);
        print("uri", uri, out);

        for(int i = 0; i < tags.length; i++)
            out.println(tags[i].toString());
        
        return sw.toString();
    }
    
    // XXX FIXME
    // resolveRelativeUri and/or getResourceAsStream don't seem to properly
    // handle relative paths when dealing when home and getDocBase are set
    // the following is a workaround until these problems are resolved.
    private InputStream getResourceAsStream(String uri) 
        throws FileNotFoundException 
    {
        if (uri.indexOf(":") > 0) {
            // may be fully qualified (Windows) or may be a URL.  Let
            // getResourceAsStream deal with it.
            return ctxt.getResourceAsStream(uri);
        } else {
            // assume it translates to a real file, and use getRealPath
            String real = ctxt.getRealPath(uri);
            return (real == null) ? null : new FileInputStream(real);
        }
    }

    public TagLibraryInfoImpl(JspCompilationContext ctxt, String prefix, String uriIn) 
        throws IOException, JasperException
    {
        super(prefix, uriIn);

	this.ctxt = ctxt;
        ZipInputStream zin;
        InputStream in = null;
        URL url = null;
        boolean relativeURL = false;
	this.uri = uriIn;

        // Parse web.xml.
        InputStream is = getResourceAsStream(WEBAPP_INF);

        if (is != null) {
            Document webtld =
                JspUtil.parseXMLDoc(is,
                                    Constants.WEBAPP_DTD_RESOURCE,
                                    Constants.WEBAPP_DTD_PUBLIC_ID);
            NodeList nList =  webtld.getElementsByTagName("taglib");

            if (nList.getLength() != 0) {
                for(int i = 0; i < nList.getLength(); i++) {
                    String tagLoc = null;
                    boolean match = false;
                    Element e =  (Element) nList.item(i);

                    // Assume only one entry for location and uri.
                    NodeList uriList = e.getElementsByTagName("taglib-uri");
                    Element uriElem = (Element) uriList.item(0);
                    Text t = (Text) uriElem.getFirstChild();

                    if (t != null) {
                        String tmpUri = t.getData();
                        if (tmpUri != null) {
                            tmpUri = tmpUri.trim();
                            if (tmpUri.equals(uriIn)) {
                                match = true;
                                NodeList locList = e.getElementsByTagName
                                    ("taglib-location");
                                Element locElem = (Element) locList.item(0);
                                Text tl = (Text) locElem.getFirstChild();
                                if (tl != null) {
                                    tagLoc = tl.getData();
                                    if (tagLoc != null)
                                        tagLoc = tagLoc.trim();
                                }
                            }
                        }
                    }
                    if (match == true && tagLoc != null) {
                        this.uri = tagLoc;

                        // If this is a relative path, then it has to be
                        // relative to where web.xml is.

                        // I'm taking the simple way out. Since web.xml 
                        // has to be directly under WEB-INF, I'm making 
                        // an absolute URI out of it by prepending WEB-INF

                        if (!uri.startsWith("/") && isRelativeURI(uri))
                            uri = "/WEB-INF/"+uri;
                    }
                }
            }
        }

        // Try to resolve URI relative to the current JSP page
        if (!uri.startsWith("/") && isRelativeURI(uri))
            uri = ctxt.resolveRelativeUri(uri);


        if (!uri.endsWith("jar")) {
	    in = getResourceAsStream(uri);
	    
	    if (in == null)
		throw new JasperException(Constants.getString("jsp.error.tld_not_found",
							      new Object[] {uri}));
	    // Now parse the tld.
	    parseTLD(in);
	}
	    
	// FIXME Take this stuff out when taglib changes are thoroughly tested.
        // 2000.11.15 commented out the 'copy to work dir' section,
        // which I believe is what this FIXME comment referred to. (pierred)
	if (uri.endsWith("jar")) {
	    
	    if (!isRelativeURI(uri)) {
		url = new URL(uri);
		in = url.openStream();
	    } else {
		relativeURL = true;
		in = getResourceAsStream(uri);
	    }
	    
	    zin = new ZipInputStream(in);
	    this.jarEntries = new Hashtable();
	    this.ctxt = ctxt;
	    
            /* NOT COMPILED
	    // First copy this file into our work directory! 
	    {
		File jspFile = new File(ctxt.getJspFile());
                String parent = jspFile.getParent();
                String jarFileName = ctxt.getOutputDir();
                if (parent != null) {
                   jarFileName = jarFileName + File.separatorChar +
                       parent;
                }
                File jspDir = new File(jarFileName);
		jspDir.mkdirs();
	    
		if (relativeURL)
		    jarFileName = jarFileName+File.separatorChar+new File(uri).getName();
		else                    
		    jarFileName = jarFileName+File.separatorChar+
			new File(url.getFile()).getName();