Support for DOMSource and other Sources

docs/api.md

@@ -4,7 +4,7 @@ The Validator offers an API which allows you to integrate Validator in your own
 
 ## Dependency Management
 
-Currently, we *do not* deploy to Maven Central or similar. Hence you need to build and optionally deploy the Validator artifacts to your own 
+Currently, we *do not* deploy to Maven Central or similar. Hence, you need to build and optionally deploy the Validator artifacts to your own 
 shared (or local) repository  (see for example [Maven Documentation](https://maven.apache.org/guides/mini/guide-3rd-party-jars-local.html)).
 
 ### Maven

src/main/java/de/kosit/validationtool/api/InputFactory.java

@@ -164,7 +164,9 @@ public class InputFactory {
     }
 
     /**
-     * Reads a test document from a {@link Source}.
+     * Reads a test document from a {@link Source}. <br/>
+     * Note: computing the hashcode is only supported for {@link StreamSource}. You can not directly use other {@link Source
+     * Soures}. You need to supply the hashcode for identification then.
      * 
      * @param source source
      * @return an {@link Input}
@@ -176,6 +178,9 @@ public class InputFactory {
     /**
      * Reads a test document from a {@link Source} using a specified digest algorithm.
      * 
+     * Note: computing the hashcode is only supported for {@link StreamSource}. You can not directly use other {@link Source
+     * Soures}. You need to supply the hashcode for identification then.
+     *
      * @param source source
      * @param digestAlgorithm the digest algorithm
      * @return an {@link Input}

src/main/java/de/kosit/validationtool/impl/input/SourceInput.java

@@ -7,13 +7,25 @@ import javax.xml.transform.Source;
 import javax.xml.transform.stream.StreamSource;
 
 import org.apache.commons.io.input.ReaderInputStream;
-import org.apache.commons.lang3.NotImplementedException;
 
 import lombok.Getter;
 import lombok.extern.slf4j.Slf4j;
 
 /**
- * A validator {@link de.kosit.validationtool.api.Input} based an on a {@link Source}.
+ * A validator {@link de.kosit.validationtool.api.Input} based on a {@link Source}. <br/>
+ * <p>
+ * Note: The various implementations of {@link Source} varies wether the can be read twice or no. This implementation
+ * tries to handle this with respect document identification (hashcode).
+ * 
+ * This class is know to work with:
+ * <ul>
+ * <li>{@link StreamSource} - both {@link java.io.InputStream} based and {@link java.io.Reader} based</li>
+ * <li>{@link javax.xml.transform.dom.DOMSource}</li>
+ * <li>{@link javax.xml.bind.util.JAXBSource}</li>
+ * </ul>
+ * 
+ * Other {@link Source Sources} may work as well, please try and let us know.
+ * </p>
  * 
  * @author Andreas Penski
  */
@@ -40,26 +52,23 @@ public class SourceInput extends AbstractInput {
     }
 
     private void validate() {
-        if (!isSupported()) {
+        if (!isHashcodeComputed() && !isSupported()) {
             throw new IllegalStateException("Unsupported source. Only StreamSource supported yet");
         }
-        if (((StreamSource) this.source).getInputStream() == null && !isHashcodeComputed()) {
+        if (!isHashcodeComputed() && ((StreamSource) this.source).getInputStream() == null) {
             log.warn("No hashcode supplied, will wrap the reader using system default charset");
         }
     }
 
     @Override
     public Source getSource() throws IOException {
-        if (!isSupported()) {
+        if (!isHashcodeComputed() && !isSupported()) {
             throw new IllegalStateException("Unsupported source. Only InputStream-based StreamSource supported yet");
         }
-        if (isWrappingRequired()) {
-            return wrap();
-        }
         if (isConsumed()) {
             throw new IllegalStateException("A SourceInput can only read once");
         }
-        return this.source;
+        return isHashcodeComputed() ? this.source : wrappedSource();
     }
 
     private boolean isSupported() {
@@ -67,9 +76,8 @@ public class SourceInput extends AbstractInput {
     }
 
     private boolean isConsumed() throws IOException {
-        if (!isStreamSource()) {
-            throw new NotImplementedException("Supports only StreamSource yet");
-        }
+        if (isStreamSource()) {
+
             final StreamSource ss = (StreamSource) this.source;
             try {
                 return (ss.getInputStream() != null && ss.getInputStream().available() == 0)
@@ -79,12 +87,14 @@ public class SourceInput extends AbstractInput {
                 return true;
             }
         }
+        return false;
+    }
 
     private boolean isStreamSource() {
         return this.source instanceof StreamSource;
     }
 
-    private Source wrap() {
+    private Source wrappedSource() {
         Source result = this.source;
         if (isStreamSource()) {
             final StreamSource ss = (StreamSource) this.source;

src/test/java/de/kosit/validationtool/api/InputFactoryTest.java

@@ -31,14 +31,29 @@ import java.net.URISyntaxException;
 import java.net.URL;
 import java.nio.file.Paths;
 
+import javax.xml.transform.Source;
+import javax.xml.transform.dom.DOMSource;
 import javax.xml.transform.stream.StreamSource;
 
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
+import org.w3c.dom.Document;
+import org.xml.sax.SAXException;
+import org.xml.sax.helpers.AttributesImpl;
 
+import de.kosit.validationtool.impl.Helper;
 import de.kosit.validationtool.impl.Helper.Simple;
+import de.kosit.validationtool.impl.TestObjectFactory;
 import de.kosit.validationtool.impl.input.SourceInput;
+import de.kosit.validationtool.impl.model.Result;
+import de.kosit.validationtool.model.reportInput.XMLSyntaxError;
+
+import net.sf.saxon.dom.NodeOverNodeInfo;
+import net.sf.saxon.s9api.BuildingContentHandler;
+import net.sf.saxon.s9api.DocumentBuilder;
+import net.sf.saxon.s9api.SaxonApiException;
+import net.sf.saxon.s9api.XdmNode;
 
 /**
  * Testet den Hashcode-Service.
@@ -163,4 +178,23 @@ public class InputFactoryTest {
         InputFactory.read(Simple.NOT_EXISTING);
     }
 
+    @Test
+    public void testDomSource() throws SaxonApiException, SAXException, IOException {
+        final DocumentBuilder builder = TestObjectFactory.createProcessor().newDocumentBuilder();
+
+        final BuildingContentHandler handler = builder.newBuildingContentHandler();
+        handler.startDocument();
+        handler.startElement("http://some.ns", "mynode", "mynode", new AttributesImpl());
+        final Document dom = NodeOverNodeInfo.wrap(handler.getDocumentNode().getUnderlyingNode()).getOwnerDocument();
+        final Input domInput = InputFactory.read(new DOMSource(dom), "MD5", "id".getBytes());
+        assertThat(domInput).isNotNull();
+        final Source source = domInput.getSource();
+        assertThat(source).isNotNull();
+        final Result<XdmNode, XMLSyntaxError> parsed = Helper.parseDocument(domInput);
+        assertThat(parsed.isValid()).isTrue();
+
+        // read twice
+        assertThat(Helper.parseDocument(domInput).getObject()).isNotNull();
+    }
+
 }