Java example source code file (LoadDocument.java)

This example Java source code file (LoadDocument.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

abstracttranslet, dom, domadapter, domenhancedfordtm, dtmaxisiterator, errormsg, exception, illegalargumentexception, multidom, sax, string, templatesimpl, transletexception, unioniterator, xsltcdtmmanager

The LoadDocument.java Java example source code

/*
 * reserved comment block
 * DO NOT REMOVE OR ALTER!
 */
/*
 * Copyright 2001-2004 The Apache Software Foundation.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/*
 * $Id: LoadDocument.java,v 1.2.4.1 2005/09/06 07:14:12 pvedula Exp $
 */

package com.sun.org.apache.xalan.internal.xsltc.dom;

import com.sun.org.apache.xalan.internal.XalanConstants;
import java.io.FileNotFoundException;

import javax.xml.transform.stream.StreamSource;

import com.sun.org.apache.xalan.internal.xsltc.DOM;
import com.sun.org.apache.xalan.internal.xsltc.DOMCache;
import com.sun.org.apache.xalan.internal.xsltc.DOMEnhancedForDTM;
import com.sun.org.apache.xalan.internal.xsltc.TransletException;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
import com.sun.org.apache.xalan.internal.xsltc.runtime.AbstractTranslet;
import com.sun.org.apache.xalan.internal.xsltc.trax.TemplatesImpl;
import com.sun.org.apache.xalan.internal.utils.SecuritySupport;
import com.sun.org.apache.xml.internal.dtm.DTM;
import com.sun.org.apache.xml.internal.dtm.DTMAxisIterator;
import com.sun.org.apache.xml.internal.dtm.DTMManager;
import com.sun.org.apache.xml.internal.dtm.ref.DTMDefaultBase;
import com.sun.org.apache.xml.internal.dtm.ref.EmptyIterator;
import com.sun.org.apache.xml.internal.utils.SystemIDResolver;

import org.xml.sax.InputSource;
import org.xml.sax.XMLReader;

/**
 * @author Morten Jorgensen
 */
public final class LoadDocument {

    private static final String NAMESPACE_FEATURE =
       "http://xml.org/sax/features/namespaces";

    /**
     * Interprets the arguments passed from the document() function (see
     * com/sun/org/apache/xalan/internal/xsltc/compiler/DocumentCall.java) and returns an
     * iterator containing the requested nodes. Builds a union-iterator if
     * several documents are requested.
     * 2 arguments arg1 and arg2.  document(Obj, node-set) call
     */
    public static DTMAxisIterator documentF(Object arg1, DTMAxisIterator arg2,
                            String xslURI, AbstractTranslet translet, DOM dom)
    throws TransletException {
        String baseURI = null;
        final int arg2FirstNode = arg2.next();
        if (arg2FirstNode == DTMAxisIterator.END) {
            //  the second argument node-set is empty
            return EmptyIterator.getInstance();
        } else {
            //System.err.println("arg2FirstNode name: "
            //                   + dom.getNodeName(arg2FirstNode )+"["
            //                   +Integer.toHexString(arg2FirstNode )+"]");
            baseURI = dom.getDocumentURI(arg2FirstNode);
            if (!SystemIDResolver.isAbsoluteURI(baseURI))
               baseURI = SystemIDResolver.getAbsoluteURIFromRelative(baseURI);
        }

        try {
            if (arg1 instanceof String) {
                if (((String)arg1).length() == 0) {
                    return document(xslURI, "", translet, dom);
                } else {
                    return document((String)arg1, baseURI, translet, dom);
                }
            } else if (arg1 instanceof DTMAxisIterator) {
                return document((DTMAxisIterator)arg1, baseURI, translet, dom);
            } else {
                final String err = "document("+arg1.toString()+")";
                throw new IllegalArgumentException(err);
            }
        } catch (Exception e) {
            throw new TransletException(e);
        }
    }
    /**
     * Interprets the arguments passed from the document() function (see
     * com/sun/org/apache/xalan/internal/xsltc/compiler/DocumentCall.java) and returns an
     * iterator containing the requested nodes. Builds a union-iterator if
     * several documents are requested.
     * 1 arguments arg.  document(Obj) call
     */
    public static DTMAxisIterator documentF(Object arg, String xslURI,
                    AbstractTranslet translet, DOM dom)
    throws TransletException {
        try {
            if (arg instanceof String) {
                if (xslURI == null )
                    xslURI = "";

                String baseURI = xslURI;
                if (!SystemIDResolver.isAbsoluteURI(xslURI))
                   baseURI = SystemIDResolver.getAbsoluteURIFromRelative(xslURI);

                String href = (String)arg;
                if (href.length() == 0) {
                    href = "";
                    // %OPT% Optimization to cache the stylesheet DOM.
                    // The stylesheet DOM is built once and cached
                    // in the Templates object.
                    TemplatesImpl templates = (TemplatesImpl)translet.getTemplates();
                    DOM sdom = null;
                    if (templates != null) {
                        sdom = templates.getStylesheetDOM();
                    }

                    // If the cached dom exists, we need to migrate it
                    // to the new DTMManager and create a DTMAxisIterator
                    // for the document.
                    if (sdom != null) {
                        return document(sdom, translet, dom);
                    }
                    else {
                        return document(href, baseURI, translet, dom, true);
                    }
                }
                else {
                    return document(href, baseURI, translet, dom);
                }
            } else if (arg instanceof DTMAxisIterator) {
                return document((DTMAxisIterator)arg, null, translet, dom);
            } else {
                final String err = "document("+arg.toString()+")";
                throw new IllegalArgumentException(err);
            }
        } catch (Exception e) {
            throw new TransletException(e);
        }
    }

    private static DTMAxisIterator document(String uri, String base,
                    AbstractTranslet translet, DOM dom)
        throws Exception
    {
        return document(uri, base, translet, dom, false);
    }

    private static DTMAxisIterator document(String uri, String base,
                    AbstractTranslet translet, DOM dom,
                    boolean cacheDOM)
    throws Exception
    {
        try {
        final String originalUri = uri;
        MultiDOM multiplexer = (MultiDOM)dom;

        // Prepend URI base to URI (from context)
        if (base != null && !base.equals("")) {
            uri = SystemIDResolver.getAbsoluteURI(uri, base);
        }

        // Return an empty iterator if the URI is clearly invalid
        // (to prevent some unncessary MalformedURL exceptions).
        if (uri == null || uri.equals("")) {
            return(EmptyIterator.getInstance());
        }

        // Check if this DOM has already been added to the multiplexer
        int mask = multiplexer.getDocumentMask(uri);
        if (mask != -1) {
            DOM newDom = ((DOMAdapter)multiplexer.getDOMAdapter(uri))
                                       .getDOMImpl();
            if (newDom instanceof DOMEnhancedForDTM) {
                return new SingletonIterator(((DOMEnhancedForDTM)newDom)
                                                               .getDocument(),
                                             true);
            }
        }

        // Check if we can get the DOM from a DOMCache
        DOMCache cache = translet.getDOMCache();
        DOM newdom;

        mask = multiplexer.nextMask(); // peek

        if (cache != null) {
            newdom = cache.retrieveDocument(base, originalUri, translet);
            if (newdom == null) {
                final Exception e = new FileNotFoundException(originalUri);
                throw new TransletException(e);
            }
        } else {
            String accessError = SecuritySupport.checkAccess(uri, translet.getAllowedProtocols(), XalanConstants.ACCESS_EXTERNAL_ALL);
            if (accessError != null) {
                ErrorMsg msg = new ErrorMsg(ErrorMsg.ACCESSING_XSLT_TARGET_ERR,
                        SecuritySupport.sanitizePath(uri), accessError);
                throw new Exception(msg.toString());
            }

            // Parse the input document and construct DOM object
            // Trust the DTMManager to pick the right parser and
            // set up the DOM correctly.
            XSLTCDTMManager dtmManager = (XSLTCDTMManager)multiplexer
                                                              .getDTMManager();
            DOMEnhancedForDTM enhancedDOM =
                    (DOMEnhancedForDTM) dtmManager.getDTM(new StreamSource(uri),
                                            false, null, true, false,
                                            translet.hasIdCall(), cacheDOM);
            newdom = enhancedDOM;

            // Cache the stylesheet DOM in the Templates object
            if (cacheDOM) {
                TemplatesImpl templates = (TemplatesImpl)translet.getTemplates();
                if (templates != null) {
                    templates.setStylesheetDOM(enhancedDOM);
                }
            }

            translet.prepassDocument(enhancedDOM);
            enhancedDOM.setDocumentURI(uri);
        }

        // Wrap the DOM object in a DOM adapter and add to multiplexer
        final DOMAdapter domAdapter = translet.makeDOMAdapter(newdom);
        multiplexer.addDOMAdapter(domAdapter);

        // Create index for any key elements
        translet.buildKeys(domAdapter, null, null, newdom.getDocument());

        // Return a singleton iterator containing the root node
        return new SingletonIterator(newdom.getDocument(), true);
        } catch (Exception e) {
            throw e;
        }
    }


    private static DTMAxisIterator document(DTMAxisIterator arg1,
                                            String baseURI,
                                            AbstractTranslet translet, DOM dom)
    throws Exception
    {
        UnionIterator union = new UnionIterator(dom);
        int node = DTM.NULL;

        while ((node = arg1.next()) != DTM.NULL) {
            String uri = dom.getStringValueX(node);
            //document(node-set) if true;  document(node-set,node-set) if false
            if (baseURI  == null) {
               baseURI = dom.getDocumentURI(node);
               if (!SystemIDResolver.isAbsoluteURI(baseURI))
                    baseURI = SystemIDResolver.getAbsoluteURIFromRelative(baseURI);
            }
            union.addIterator(document(uri, baseURI, translet, dom));
        }
        return(union);
    }

    /**
     * Create a DTMAxisIterator for the newdom. This is currently only
     * used to create an iterator for the cached stylesheet DOM.
     *
     * @param newdom the cached stylesheet DOM
     * @param translet the translet
     * @param the main dom (should be a MultiDOM)
     * @return a DTMAxisIterator from the document root
     */
    private static DTMAxisIterator document(DOM newdom,
                                            AbstractTranslet translet,
                                            DOM dom)
        throws Exception
    {
        DTMManager dtmManager = ((MultiDOM)dom).getDTMManager();
        // Need to migrate the cached DTM to the new DTMManager
        if (dtmManager != null && newdom instanceof DTM) {
            ((DTM)newdom).migrateTo(dtmManager);
        }

        translet.prepassDocument(newdom);

        // Wrap the DOM object in a DOM adapter and add to multiplexer
        final DOMAdapter domAdapter = translet.makeDOMAdapter(newdom);
        ((MultiDOM)dom).addDOMAdapter(domAdapter);

        // Create index for any key elements
        translet.buildKeys(domAdapter, null, null,
                           newdom.getDocument());

        // Return a singleton iterator containing the root node
        return new SingletonIterator(newdom.getDocument(), true);
    }

}