Thread: [Practicalxml-commits] SF.net SVN: practicalxml:[28] trunk/src

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Revision: 28
          http://practicalxml.svn.sourceforge.net/practicalxml/?rev=28&view=rev
Author:   kdgregory
Date:     2008-10-08 00:08:37 +0000 (Wed, 08 Oct 2008)

Log Message:
-----------
SchemaUtil: initial revision

Added Paths:
-----------
    trunk/src/main/java/net/sf/practicalxml/SchemaUtil.java
    trunk/src/test/java/net/sf/practicalxml/TestSchemaUtil.java

Added: trunk/src/main/java/net/sf/practicalxml/SchemaUtil.java
===================================================================

--- trunk/src/main/java/net/sf/practicalxml/SchemaUtil.java	                        (rev 0)
+++ trunk/src/main/java/net/sf/practicalxml/SchemaUtil.java	2008-10-08 00:08:37 UTC (rev 28)
@@ -0,0 +1,109 @@
+package net.sf.practicalxml;
+
+import javax.xml.XMLConstants;
+import javax.xml.transform.dom.DOMSource;
+import javax.xml.validation.Schema;
+import javax.xml.validation.SchemaFactory;
+
+import org.w3c.dom.Document;
+import org.w3c.dom.Element;
+import org.w3c.dom.Node;
+import org.xml.sax.ErrorHandler;
+import org.xml.sax.InputSource;
+import org.xml.sax.SAXException;
+
+
+/**
+ *  A collection of static utility methods for working with XML Schema
+ *  documents. Since <code>javax.xml.validation.Schema</code> is an
+ *  opaque object, most of these actually work with DOM documents that
+ *  contain an XSD.
+ */
+public class SchemaUtil
+{
+    private final static String SCHEMA_NS = XMLConstants.W3C_XML_SCHEMA_NS_URI;
+    private final static String SCHEMA_PREFIX = "xsd";
+    private final static String SCHEMA_ROOT = "schema";
+
+
+    /**
+     *  Creates a new <code>javax.xml.validation.SchemaFactory</code> instance
+     *  for validation with XML Schema, which reports errors via the specified
+     *  error handler.
+     */
+    public synchronized static SchemaFactory newFactory(ErrorHandler errHandler)
+    {
+        SchemaFactory fact = SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
+        fact.setErrorHandler(errHandler);
+        return fact;
+    }
+
+
+    /**
+     *  A workaround for Sun bug <a href="http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6198705">
+     *  6198705</code>, also known as Xerces bug <a href="http://issues.apache.org/jira/browse/XERCESJ-1130">
+     *  XERCESJ-1130</code>, which prevents the <code>SchemaFactory.ewSchema</code>
+     *  method from combining multiple sources that have the same namespace.
+     *  <p>
+     *  This method works by parsing the children of the passed sources,
+     *  verifying that their root element is <code>&lt;xsd:schema&gt;</code>,
+     *  combining the children of this root into a new document, and calling
+     *  <code>newSchema()</code> on the result.
+     *
+     *  @param  factory Used to create the schema object. This factory's
+     *                  <code>ErrorHandler</code> is also used to report
+     *                  errors when parsing the source documents.
+     *  @param  sources The source schema documents.
+     *
+     *  @throws XmlException on any failure that is not handled by the
+     *          factory's <code>ErrorHandler</code>. This includes parse
+     *          errors and local validation of the source root element.
+     */
+    public static Schema newSchema(SchemaFactory factory, InputSource... sources)
+    {
+        Element combined = DomUtil.newDocument(SCHEMA_NS, SCHEMA_PREFIX + ":" + SCHEMA_ROOT);
+        for (InputSource source : sources)
+        {
+            combineSchema(combined, source);
+        }
+
+        System.out.println(OutputUtil.indentedString(combined.getOwnerDocument(), 4));
+
+        try
+        {
+            synchronized (factory)
+            {
+                return factory.newSchema(new DOMSource(combined.getOwnerDocument()));
+            }
+        }
+        catch (SAXException e)
+        {
+            throw new XmlException("unable to generate schema", e);
+        }
+    }
+
+
+//----------------------------------------------------------------------------
+//  Internals
+//----------------------------------------------------------------------------
+
+    /**
+     *  Parses, verifies, and combines a source document.
+     */
+    private static void combineSchema(Element newRoot, InputSource source)
+    {
+        Document doc = ParseUtil.parse(source);
+        Element root = doc.getDocumentElement();
+        if (!DomUtil.isNamed(root, SCHEMA_NS, SCHEMA_ROOT))
+        {
+            throw new XmlException("invalid root element name: {"
+                                   + root.getNamespaceURI() + "}"
+                                   + DomUtil.getLocalName(root));
+        }
+        for (Element child : DomUtil.getChildren(root))
+        {
+            Node tmp = newRoot.getOwnerDocument().importNode(child, true);
+            newRoot.appendChild(tmp);
+        }
+    }
+}

Added: trunk/src/test/java/net/sf/practicalxml/TestSchemaUtil.java
===================================================================
--- trunk/src/test/java/net/sf/practicalxml/TestSchemaUtil.java	                        (rev 0)
+++ trunk/src/test/java/net/sf/practicalxml/TestSchemaUtil.java	2008-10-08 00:08:37 UTC (rev 28)
@@ -0,0 +1,91 @@
+package net.sf.practicalxml;
+
+import java.io.Reader;
+import java.io.StringReader;
+
+import javax.xml.validation.Schema;
+import javax.xml.validation.SchemaFactory;
+
+import net.sf.practicalxml.misc.ExceptionErrorHandler;
+
+import org.xml.sax.ErrorHandler;
+import org.xml.sax.InputSource;
+
+import junit.framework.TestCase;
+
+
+public class TestSchemaUtil extends TestCase
+{
+//----------------------------------------------------------------------------
+//  Definitions for newSchema() testing
+//----------------------------------------------------------------------------
+
+    public final static String  NEW_SCHEMA_START
+    = "<xsd:schema xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\">";
+
+    public final static String  NEW_SCHEMA_DEF_1
+    = "<xsd:element name=\"foo\" type=\"FooType\"/>";
+
+    public final static String  NEW_SCHEMA_DEF_2
+    = "<xsd:complexType name=\"FooType\">"
+    +    "<xsd:sequence>"
+    +       "<xsd:element name=\"argle\" type=\"xsd:integer\"/>"
+    +       "<xsd:element name=\"bargle\" type=\"BarType\"/>"
+    +    "</xsd:sequence>"
+    + "</xsd:complexType>";
+
+    public final static String  NEW_SCHEMA_DEF_3
+    = "<xsd:simpleType name=\"BarType\">"
+    +    "<xsd:restriction base=\"xsd:string\">"
+    +    "</xsd:restriction>"
+    + "</xsd:simpleType>";
+
+    public final static String  NEW_SCHEMA_FINISH
+    = "</xsd:schema>";
+
+
+//----------------------------------------------------------------------------
+//  Test Cases
+//----------------------------------------------------------------------------
+
+    public void testNewFactory() throws Exception
+    {
+        ErrorHandler errHandler = new ExceptionErrorHandler();
+        SchemaFactory fact = SchemaUtil.newFactory(errHandler);
+
+        assertNotNull(fact);
+        assertSame(errHandler, fact.getErrorHandler());
+    }
+
+
+    public void testNewSchemaWithSingleSource() throws Exception
+    {
+        Reader xsd = new StringReader(
+                        NEW_SCHEMA_START
+                        + NEW_SCHEMA_DEF_1 + NEW_SCHEMA_DEF_2 + NEW_SCHEMA_DEF_3
+                        + NEW_SCHEMA_FINISH);
+
+        Schema schema = SchemaUtil.newSchema(
+                            SchemaUtil.newFactory(new ExceptionErrorHandler()),
+                            new InputSource(xsd));
+        assertNotNull(schema);
+    }
+
+
+    public void testNewSchemaWithMultipleSources() throws Exception
+    {
+        Reader xsd1 = new StringReader(
+                        NEW_SCHEMA_START + NEW_SCHEMA_DEF_1 + NEW_SCHEMA_FINISH);
+        Reader xsd2 = new StringReader(
+                        NEW_SCHEMA_START + NEW_SCHEMA_DEF_2 + NEW_SCHEMA_FINISH);
+        Reader xsd3 = new StringReader(
+                        NEW_SCHEMA_START + NEW_SCHEMA_DEF_3 + NEW_SCHEMA_FINISH);
+
+        Schema schema = SchemaUtil.newSchema(
+                            SchemaUtil.newFactory(new ExceptionErrorHandler()),
+                            new InputSource(xsd1),
+                            new InputSource(xsd2),
+                            new InputSource(xsd3));
+        assertNotNull(schema);
+    }
+}


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Thread: [Practicalxml-commits] SF.net SVN: practicalxml:[28] trunk/src

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