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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
---|---|---|
committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/xml/stream/XIncludeFilter.java | |
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Diffstat (limited to 'libjava/classpath/gnu/xml/stream/XIncludeFilter.java')
-rw-r--r-- | libjava/classpath/gnu/xml/stream/XIncludeFilter.java | 931 |
1 files changed, 931 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/xml/stream/XIncludeFilter.java b/libjava/classpath/gnu/xml/stream/XIncludeFilter.java new file mode 100644 index 000000000..6d955c492 --- /dev/null +++ b/libjava/classpath/gnu/xml/stream/XIncludeFilter.java @@ -0,0 +1,931 @@ +/* XIncludeFilter.java -- + Copyright (C) 2005 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package gnu.xml.stream; + +import java.io.InputStream; +import java.io.InputStreamReader; +import java.io.IOException; +import java.io.Reader; +import java.net.HttpURLConnection; +import java.net.URL; +import java.net.URLConnection; +import java.util.HashSet; +import java.util.NoSuchElementException; +import java.util.StringTokenizer; +import javax.xml.namespace.QName; +import javax.xml.parsers.DocumentBuilder; +import javax.xml.parsers.DocumentBuilderFactory; +import javax.xml.parsers.ParserConfigurationException; +import javax.xml.stream.XMLStreamConstants; +import javax.xml.stream.XMLStreamException; +import javax.xml.stream.XMLStreamReader; +import javax.xml.stream.util.StreamReaderDelegate; + +import org.w3c.dom.Attr; +import org.w3c.dom.Document; +import org.w3c.dom.DOMImplementation; +import org.w3c.dom.NamedNodeMap; +import org.w3c.dom.Node; +import org.w3c.dom.ProcessingInstruction; +import org.w3c.dom.TypeInfo; +import org.w3c.dom.traversal.DocumentTraversal; +import org.w3c.dom.traversal.NodeFilter; +import org.w3c.dom.traversal.TreeWalker; +import org.w3c.dom.xpath.XPathEvaluator; +import org.w3c.dom.xpath.XPathNSResolver; +import org.w3c.dom.xpath.XPathResult; +import org.xml.sax.SAXException; + +/** + * StAX filter for performing XInclude processing. + * + * @see http://www.w3.org/TR/xinclude/ + * @see http://www.w3.org/TR/xptr-framework/ + * @see http://www.w3.org/TR/xptr-element/ + * + * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> + */ +class XIncludeFilter + extends StreamReaderDelegate +{ + + static final String XINCLUDE_NS_URI = "http://www.w3.org/2001/XInclude"; + static final int SHOW_FLAGS = + NodeFilter.SHOW_CDATA_SECTION | + NodeFilter.SHOW_COMMENT | + NodeFilter.SHOW_ELEMENT | + NodeFilter.SHOW_ENTITY_REFERENCE | + NodeFilter.SHOW_PROCESSING_INSTRUCTION | + NodeFilter.SHOW_TEXT; + + final String systemId; + final boolean namespaceAware; + final boolean validating; + final boolean expandERefs; + String href; + int event; + boolean included; + XPathResult result; + int snapshotIndex; + Node current; + TreeWalker walker; + HashSet seen = new HashSet(); + boolean backtracking; + boolean lookahead; + + Reader includedText; + char[] buf; + int len = -1; + boolean inInclude, inFallback, seenFallback; + + DocumentBuilder builder; + + XIncludeFilter(XMLStreamReader reader, String systemId, + boolean namespaceAware, boolean validating, + boolean expandERefs) + { + super(reader); + this.systemId = XMLParser.absolutize(null, systemId); + this.namespaceAware = namespaceAware; + this.validating = validating; + this.expandERefs = expandERefs; + } + + public int getAttributeCount() + { + if (current != null) + { + NamedNodeMap attrs = current.getAttributes(); + return (attrs == null) ? 0 : attrs.getLength(); + } + return super.getAttributeCount(); + } + + public String getAttributeLocalName(int index) + { + if (current != null) + { + NamedNodeMap attrs = current.getAttributes(); + if (attrs == null) + return null; + Node attr = attrs.item(index); + return attr.getLocalName(); + } + return super.getAttributeLocalName(index); + } + + public String getAttributeNamespace(int index) + { + if (current != null) + { + NamedNodeMap attrs = current.getAttributes(); + if (attrs == null) + return null; + Node attr = attrs.item(index); + return attr.getNamespaceURI(); + } + return super.getAttributeNamespace(index); + } + + public String getAttributePrefix(int index) + { + if (current != null) + { + NamedNodeMap attrs = current.getAttributes(); + if (attrs == null) + return null; + Node attr = attrs.item(index); + return attr.getPrefix(); + } + return super.getAttributePrefix(index); + } + + public QName getAttributeName(int index) + { + if (current != null) + { + NamedNodeMap attrs = current.getAttributes(); + if (attrs == null) + return null; + Node attr = attrs.item(index); + String localName = attr.getLocalName(); + String uri = attr.getNamespaceURI(); + String prefix = attr.getPrefix(); + return new QName(uri, localName, prefix); + } + return super.getAttributeName(index); + } + + public String getAttributeType(int index) + { + if (current != null) + { + NamedNodeMap attrs = current.getAttributes(); + if (attrs == null) + return null; + Attr attr = (Attr) attrs.item(index); + TypeInfo ti = attr.getSchemaTypeInfo(); + return (ti == null) ? "CDATA" : ti.getTypeName(); + } + return super.getAttributeType(index); + } + + public boolean isAttributeSpecified(int index) + { + if (current != null) + { + NamedNodeMap attrs = current.getAttributes(); + if (attrs == null) + return false; + Attr attr = (Attr) attrs.item(index); + return attr.getSpecified(); + } + return super.isAttributeSpecified(index); + } + + public String getAttributeValue(int index) + { + if (current != null) + { + NamedNodeMap attrs = current.getAttributes(); + if (attrs == null) + return null; + Node attr = attrs.item(index); + return attr.getNodeValue(); + } + return super.getAttributeValue(index); + } + + public String getAttributeValue(String uri, String localName) + { + if (current != null) + { + NamedNodeMap attrs = current.getAttributes(); + if (attrs == null) + return null; + Node attr = attrs.getNamedItemNS(uri, localName); + return (attr == null) ? null : attr.getNodeValue(); + } + return super.getAttributeValue(uri, localName); + } + + public String getElementText() + throws XMLStreamException + { + if (current != null) + return current.getTextContent(); + return super.getElementText(); + } + + public int getEventType() + { + return event; + } + + public String getLocalName() + { + if (current != null) + return current.getLocalName(); + return super.getLocalName(); + } + + public QName getName() + { + if (current != null) + { + String localName = current.getLocalName(); + String uri = current.getNamespaceURI(); + String prefix = current.getPrefix(); + return new QName(uri, localName, prefix); + } + return super.getName(); + } + + public String getNamespaceURI() + { + if (current != null) + return current.getNamespaceURI(); + return super.getNamespaceURI(); + } + + // TODO namespaces + + public String getPIData() + { + if (current != null) + return ((ProcessingInstruction) current).getData(); + return super.getPIData(); + } + + public String getPITarget() + { + if (current != null) + return ((ProcessingInstruction) current).getTarget(); + return super.getPITarget(); + } + + public String getPrefix() + { + if (current != null) + return current.getPrefix(); + return super.getPrefix(); + } + + public String getText() + { + if (current != null) + return current.getNodeValue(); + if (walker != null) + { + Node n = walker.getCurrentNode(); + if (n != null) + return n.getTextContent(); + } + if (buf != null) + return new String(buf, 0, len); + return super.getText(); + } + + public char[] getTextCharacters() + { + if (current != null) + { + buf = current.getNodeValue().toCharArray(); + len = buf.length; + } + if (buf != null) + return buf; + return super.getTextCharacters(); + } + + public int getTextCharacters(int sourceStart, char[] target, + int targetStart, int length) + throws XMLStreamException + { + if (current != null) + { + buf = current.getNodeValue().toCharArray(); + len = buf.length; + } + if (buf != null) + { + int max = Math.min(len - sourceStart, length); + if (max > 0) + System.arraycopy(buf, sourceStart, target, targetStart, max); + return max; + } + return super.getTextCharacters(sourceStart, target, targetStart, length); + } + + public int getTextLength() + { + if (current != null) + { + buf = current.getNodeValue().toCharArray(); + len = buf.length; + } + if (buf != null) + return len; + return super.getTextLength(); + } + + public int getTextStart() + { + if (current != null) + { + buf = current.getNodeValue().toCharArray(); + len = buf.length; + } + if (buf != null) + return 0; + return super.getTextStart(); + } + + public boolean hasNext() + throws XMLStreamException + { + if (!lookahead) + { + try + { + next(); + } + catch (NoSuchElementException e) + { + event = -1; + } + lookahead = true; + } + return (event != -1); + } + + public int next() + throws XMLStreamException + { + if (lookahead) + { + lookahead = false; + return event; + } + buf = null; + len = 0; + if (walker != null) + { + Node c = walker.getCurrentNode(); + Node n = null; + if (c.getNodeType() == Node.ELEMENT_NODE) + { + boolean isStartElement = !seen.contains(c); + if (isStartElement) + { + seen.add(c); + current = c; + event = XMLStreamConstants.START_ELEMENT; + return event; + } + else if (backtracking) + { + n = walker.nextSibling(); + if (n != null) + backtracking = false; + } + else + { + n = walker.firstChild(); + if (n == null) + n = walker.nextSibling(); + } + } + else + { + n = walker.firstChild(); + if (n == null) + n = walker.nextSibling(); + } + if (n == null) + { + current = walker.parentNode(); + if (current != null && current.getNodeType() == Node.ELEMENT_NODE) + { + // end-element + backtracking = true; + event = XMLStreamConstants.END_ELEMENT; + return event; + } + else + { + walker = null; + current = null; + } + } + else + { + current = n; + switch (n.getNodeType()) + { + case Node.ELEMENT_NODE: + return next(); + case Node.TEXT_NODE: + String text = n.getNodeValue(); + buf = text.toCharArray(); + len = buf.length; + event = isSpace(buf, len) ? + XMLStreamConstants.SPACE : + XMLStreamConstants.CHARACTERS; + return event; + case Node.CDATA_SECTION_NODE: + event = XMLStreamConstants.CDATA; + return event; + case Node.COMMENT_NODE: + event = XMLStreamConstants.COMMENT; + return event; + case Node.PROCESSING_INSTRUCTION_NODE: + event = XMLStreamConstants.PROCESSING_INSTRUCTION; + return event; + case Node.ENTITY_REFERENCE_NODE: + event = XMLStreamConstants.ENTITY_REFERENCE; + return event; + default: + throw new IllegalStateException(); + } + } + } + if (result != null) + { + switch (result.getResultType()) + { + case XPathResult.BOOLEAN_TYPE: + boolean bval = result.getBooleanValue(); + String btext = bval ? "true" : "false"; + buf = btext.toCharArray(); + len = buf.length; + result = null; + event = XMLStreamConstants.CHARACTERS; + return event; + case XPathResult.NUMBER_TYPE: + double nval = result.getNumberValue(); + String ntext = Double.toString(nval); + buf = ntext.toCharArray(); + len = buf.length; + result = null; + event = XMLStreamConstants.CHARACTERS; + return event; + case XPathResult.STRING_TYPE: + String stext = result.getStringValue(); + buf = stext.toCharArray(); + len = buf.length; + result = null; + event = isSpace(buf, len) ? + XMLStreamConstants.SPACE : + XMLStreamConstants.CHARACTERS; + return event; + case XPathResult.ANY_UNORDERED_NODE_TYPE: + case XPathResult.FIRST_ORDERED_NODE_TYPE: + Node n1 = result.getSingleNodeValue(); + Document d1 = getDocument(n1); + walker = getDocumentTraversal(d1) + .createTreeWalker(n1, SHOW_FLAGS, null, expandERefs); + result = null; + return next(); + case XPathResult.ORDERED_NODE_ITERATOR_TYPE: + case XPathResult.UNORDERED_NODE_ITERATOR_TYPE: + Node n2 = result.iterateNext(); + if (n2 == null) + { + result = null; + return next(); + } + Document d2 = getDocument(n2); + walker = getDocumentTraversal(d2) + .createTreeWalker(n2, SHOW_FLAGS, null, expandERefs); + return next(); + case XPathResult.ORDERED_NODE_SNAPSHOT_TYPE: + case XPathResult.UNORDERED_NODE_SNAPSHOT_TYPE: + Node n3 = result.snapshotItem(snapshotIndex++); + if (n3 == null) + { + result = null; + return next(); + } + Document d3 = getDocument(n3); + walker = getDocumentTraversal(d3) + .createTreeWalker(n3, SHOW_FLAGS, null, expandERefs); + return next(); + default: + throw new IllegalStateException(); + } + } + if (includedText != null) + { + // fill buffer + if (buf == null) + buf = new char[2048]; + try + { + len = includedText.read(buf, 0, buf.length); + if (len == -1) + { + includedText = null; + buf = null; + return next(); + } + // chars or space? + return (event = isSpace(buf, len) ? + XMLStreamConstants.SPACE : + XMLStreamConstants.CHARACTERS); + } + catch (IOException e) + { + XMLStreamException e2 = new XMLStreamException(e.getMessage()); + e2.initCause(e); + throw e2; + } + } + event = super.next(); + switch (event) + { + case XMLStreamConstants.START_ELEMENT: + String uri = getNamespaceURI(); + if (XINCLUDE_NS_URI.equals(uri)) + { + String localName = getLocalName(); + if ("include".equals(localName)) + { + href = getAttributeValue(null, "href"); + String parse = getAttributeValue(null, "parse"); + String xpointer = getAttributeValue(null, "xpointer"); + String encoding = getAttributeValue(null, "encoding"); + String accept = getAttributeValue(null, "accept"); + String acceptLanguage = getAttributeValue(null, + "accept-language"); + if (includeResource(href, parse, xpointer, encoding, + accept, acceptLanguage)) + { + // Skip to xi:include end-element event + int depth = 0; + while (depth >= 0) + { + event = super.next(); + switch (event) + { + case XMLStreamConstants.START_ELEMENT: + depth++; + break; + case XMLStreamConstants.END_ELEMENT: + depth--; + } + } + } + else + inInclude = true; + } + else if (inInclude && "fallback".equals(localName)) + { + if (!seenFallback) + inFallback = seenFallback = true; + else + throw new XMLStreamException("duplicate xi:fallback element"); + } + else if (inInclude) + { + throw new XMLStreamException("illegal xi element '" + + localName + "'"); + } + return next(); + } + break; + case XMLStreamConstants.END_ELEMENT: + String uri2 = getNamespaceURI(); + if (XINCLUDE_NS_URI.equals(uri2)) + { + String localName = getLocalName(); + if ("include".equals(localName)) + { + if (!seenFallback && included) + { + String msg = "Unable to read " + href + + " and no xi:fallback element present"; + throw new XMLStreamException(msg); + } + included = false; + href = null; + inInclude = inFallback = seenFallback = false; + } + else if ("fallback".equals(localName)) + inFallback = false; + return next(); + } + break; + } + if (inInclude && !inFallback) + return next(); + return event; + } + + boolean isSpace(char[] text, int len) + { + boolean space = true; + for (int i = 0; i < len; i++) + { + char c = text[i]; + if (c != ' ' && c != '\t' && c != '\n' && c != '\r') + { + space = false; + break; + } + } + return space; + } + + String getBaseURI() + { + String base = (String) getParent().getProperty("gnu.xml.stream.baseURI"); + return (base == null) ? systemId : base; + } + + boolean includeResource(String href, String parse, String xpointer, + String encoding, String accept, + String acceptLanguage) + { + included = false; + try + { + if (xpointer != null) + throw new XMLStreamException("xpointer attribute not yet supported"); + String base = getBaseURI(); + if (href == null || "".equals(href)) + href = base; + else + href = XMLParser.absolutize(base, href); + if (parse == null || "xml".equals(parse)) + { + seen.clear(); + result = null; + snapshotIndex = 0; + walker = null; + current = null; + backtracking = false; + + URLConnection connection = getURLConnection(href, accept, + acceptLanguage); + InputStream in = connection.getInputStream(); + Document doc = getDocumentBuilder().parse(in, href); + DocumentTraversal dt = getDocumentTraversal(doc); + if (xpointer == null) + { + result = null; + Node item = doc.getDocumentElement(); + walker = dt.createTreeWalker(item, SHOW_FLAGS, null, + expandERefs); + } + else + { + result = null; + snapshotIndex = 0; + walker = null; + // shorthand or scheme-based? + int lpi = xpointer.indexOf('('); + int rpi = xpointer.indexOf(')', lpi); + if (lpi != -1 && rpi != -1) + { + String scheme = xpointer.substring(0, lpi); + if ("element".equals(scheme)) + { + // element() scheme + String elementSchemeData = + xpointer.substring(lpi + 1, rpi); + Node item = doc; + int si = elementSchemeData.indexOf('/'); + if (si == -1) + { + if (elementSchemeData.length() > 0) + item = doc.getElementById(elementSchemeData); + } + else + { + if (si > 0) + { + String context = + elementSchemeData.substring(0, si); + item = doc.getElementById(context); + elementSchemeData = + elementSchemeData.substring(si + 1); + } + StringTokenizer st = + new StringTokenizer(elementSchemeData, "/"); + while (st.hasMoreTokens() && item != null) + { + int n = Integer.parseInt(st.nextToken()); + Node ctx = item.getFirstChild(); + int count = 1; + while (ctx != null && count++ < n) + ctx = ctx.getNextSibling(); + item = ctx; + } + } + walker = dt.createTreeWalker(item, SHOW_FLAGS, null, + expandERefs); + included = true; + } + else if ("xpointer".equals(scheme)) + { + xpointer = xpointer.substring(lpi + 1, rpi); + XPathEvaluator eval = getXPathEvaluator(doc); + XPathNSResolver resolver = eval.createNSResolver(doc); + result = + (XPathResult) eval.evaluate(xpointer, doc, + resolver, + XPathResult.ANY_TYPE, + null); + // TODO xpointer() scheme functions + included = true; + } + else + { + String msg = "Unknown XPointer scheme: " + scheme; + throw new XMLStreamException(msg); + } + } + else + { + Node item = doc.getElementById(xpointer); + walker = dt.createTreeWalker(item, SHOW_FLAGS, null, + expandERefs); + included = true; + } + } + } + else if ("text".equals(parse)) + { + URLConnection connection = getURLConnection(href, accept, + acceptLanguage); + InputStream in = connection.getInputStream(); + if (encoding == null) + { + encoding = connection.getContentEncoding(); + if (encoding == null) + { + String contentType = connection.getContentType(); + if (contentType != null) + encoding = getParameter(contentType, "charset"); + } + } + if (encoding == null) + includedText = new InputStreamReader(in, "UTF-8"); + else + includedText = new InputStreamReader(in, encoding); + included = true; + } + else + throw new XMLStreamException("value of 'parse' attribute must be "+ + "'xml' or 'text'"); + return true; + } + catch (IOException e) + { + return false; + } + catch (XMLStreamException e) + { + return false; + } + catch (SAXException e) + { + return false; + } + } + + URLConnection getURLConnection(String href, String accept, + String acceptLanguage) + throws IOException + { + URL url = new URL(href); + URLConnection connection = url.openConnection(); + if (connection instanceof HttpURLConnection) + { + HttpURLConnection http = (HttpURLConnection) connection; + http.setInstanceFollowRedirects(true); + if (accept != null) + http.setRequestProperty("Accept", accept); + if (acceptLanguage != null) + http.setRequestProperty("Accept-Language", acceptLanguage); + } + return connection; + } + + Document getDocument(Node node) + { + if (node.getNodeType() == Node.DOCUMENT_NODE) + return (Document) node; + return node.getOwnerDocument(); + } + + DocumentBuilder getDocumentBuilder() + throws XMLStreamException + { + if (builder == null) + { + try + { + DocumentBuilderFactory f = DocumentBuilderFactory.newInstance(); + f.setXIncludeAware(true); + f.setNamespaceAware(namespaceAware); + f.setValidating(validating); + builder = f.newDocumentBuilder(); + } + catch (ParserConfigurationException e) + { + XMLStreamException e2 = new XMLStreamException(e.getMessage()); + e2.initCause(e); + throw e2; + } + } + builder.reset(); + return builder; + } + + DocumentTraversal getDocumentTraversal(Document doc) + throws XMLStreamException + { + DOMImplementation dom = doc.getImplementation(); + if (!dom.hasFeature("Traversal", "2.0")) + throw new XMLStreamException("Traversal not supported"); + return (DocumentTraversal) doc; + } + + XPathEvaluator getXPathEvaluator(Document doc) + throws XMLStreamException + { + DOMImplementation dom = doc.getImplementation(); + if (!dom.hasFeature("XPath", "3.0")) + throw new XMLStreamException("XPath not supported"); + return (XPathEvaluator) doc; + } + + static String getParameter(String contentType, String name) + { + StringTokenizer st = new StringTokenizer(contentType, " ;"); + if (st.hasMoreTokens()) + st.nextToken(); + while (st.hasMoreTokens()) + { + String token = st.nextToken(); + int ei = token.indexOf('='); + if (ei != -1) + { + String key = token.substring(0, ei); + if (key.equals(name)) + { + String value = token.substring(ei + 1); + int len = value.length(); + if (len > 1 && + value.charAt(0) == '"' && + value.charAt(len - 1) == '"') + value = value.substring(1, len - 1); + else if (len > 1 && + value.charAt(0) == '\'' && + value.charAt(len - 1) == '\'') + value = value.substring(1, len - 1); + return value; + } + } + } + return null; + } + +} |