From be88458d8bf4bd118325b72dc5a39c7e1caf6c71 Mon Sep 17 00:00:00 2001 From: rfeng Date: Fri, 7 Aug 2009 16:59:01 +0000 Subject: Add a few typed getAttribute methods git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@802091 13f79535-47bb-0310-9956-ffa450edef68 --- .../tuscany/sca/common/xml/stax/StAXHelper.java | 124 +++++++++++++++++++++ 1 file changed, 124 insertions(+) (limited to 'java/sca') diff --git a/java/sca/modules/common-xml/src/main/java/org/apache/tuscany/sca/common/xml/stax/StAXHelper.java b/java/sca/modules/common-xml/src/main/java/org/apache/tuscany/sca/common/xml/stax/StAXHelper.java index f303e63004..4ba5acde53 100644 --- a/java/sca/modules/common-xml/src/main/java/org/apache/tuscany/sca/common/xml/stax/StAXHelper.java +++ b/java/sca/modules/common-xml/src/main/java/org/apache/tuscany/sca/common/xml/stax/StAXHelper.java @@ -24,9 +24,16 @@ import java.io.Reader; import java.io.StringReader; import java.io.StringWriter; import java.io.Writer; +import java.util.ArrayList; +import java.util.Collections; +import java.util.List; +import java.util.StringTokenizer; +import javax.xml.XMLConstants; +import javax.xml.namespace.QName; import javax.xml.stream.XMLInputFactory; import javax.xml.stream.XMLOutputFactory; +import javax.xml.stream.XMLStreamConstants; import javax.xml.stream.XMLStreamException; import javax.xml.stream.XMLStreamReader; import javax.xml.stream.XMLStreamWriter; @@ -172,4 +179,121 @@ public class StAXHelper { new StAX2SAXAdapter(false).parse(reader, contentHandler); } + /** + * Returns the boolean value of an attribute. + * @param reader + * @param name + * @return + */ + public static Boolean getAttributeAsBoolean(XMLStreamReader reader, String name) { + String value = reader.getAttributeValue(null, name); + if (value == null) { + return null; + } + return Boolean.valueOf(value); + } + + /** + * Returns the QName value of an attribute. + * @param reader + * @param name + * @return + */ + public static QName getAttributeAsQName(XMLStreamReader reader, String name) { + String qname = reader.getAttributeValue(null, name); + return getValueAsQName(reader, qname); + } + + /** + * Returns the value of an attribute as a list of QNames. + * @param reader + * @param name + * @return + */ + public static List getAttributeAsQNames(XMLStreamReader reader, String name) { + String value = reader.getAttributeValue(null, name); + if (value != null) { + List qnames = new ArrayList(); + for (StringTokenizer tokens = new StringTokenizer(value); tokens.hasMoreTokens();) { + qnames.add(getValueAsQName(reader, tokens.nextToken())); + } + return qnames; + } else { + return Collections.emptyList(); + } + } + + /** + * Returns a QName from a string. + * @param reader + * @param value + * @return + */ + public static QName getValueAsQName(XMLStreamReader reader, String value) { + if (value != null) { + int index = value.indexOf(':'); + String prefix = index == -1 ? "" : value.substring(0, index); + String localName = index == -1 ? value : value.substring(index + 1); + String ns = reader.getNamespaceContext().getNamespaceURI(prefix); + if (ns == null) { + ns = ""; + } + return new QName(ns, localName, prefix); + } else { + return null; + } + } + + /** + * Returns the string value of an attribute. + * @param reader + * @param name + * @return + */ + public static String getAttributeAsString(XMLStreamReader reader, String name) { + return reader.getAttributeValue(null, name); + } + + /** + * Returns the value of xsi:type attribute + * @param reader The XML stream reader + * @return The QName of the type, if the attribute is not present, null is + * returned. + */ + public static QName getXSIType(XMLStreamReader reader) { + String qname = reader.getAttributeValue(XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI, "type"); + return getValueAsQName(reader, qname); + } + + /** + * Test if an attribute is explicitly set + * @param reader + * @param name + * @return + */ + public static boolean isAttributePresent(XMLStreamReader reader, String name) { + return reader.getAttributeValue(null, name) != null; + } + + /** + * Advance the stream to the next END_ELEMENT event skipping any nested + * content. + * @param reader the reader to advance + * @throws XMLStreamException if there was a problem reading the stream + */ + public static void skipToEndElement(XMLStreamReader reader) throws XMLStreamException { + int depth = 0; + while (reader.hasNext()) { + int event = reader.next(); + if (event == XMLStreamConstants.START_ELEMENT) { + depth++; + } else if (event == XMLStreamConstants.END_ELEMENT) { + if (depth == 0) { + return; + } + depth--; + } + } + } + } -- cgit v1.2.3