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Library for validating XML documents with Schematron
/**
* Copyright (C) 2014-2017 Philip Helger (www.helger.com)
* philip[at]helger[dot]com
*
* 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.
*/
package com.helger.schematron.pure.validation.xpath;
import java.util.List;
import java.util.Map;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.NotThreadSafe;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import org.oclc.purl.dsdl.svrl.ActivePattern;
import org.oclc.purl.dsdl.svrl.DiagnosticReference;
import org.oclc.purl.dsdl.svrl.FailedAssert;
import org.oclc.purl.dsdl.svrl.FiredRule;
import org.oclc.purl.dsdl.svrl.NsPrefixInAttributeValues;
import org.oclc.purl.dsdl.svrl.SchematronOutputType;
import org.oclc.purl.dsdl.svrl.SuccessfulReport;
import org.w3c.dom.Node;
import com.helger.commons.ValueEnforcer;
import com.helger.commons.collection.CollectionHelper;
import com.helger.commons.state.EContinue;
import com.helger.schematron.pure.bound.xpath.PSXPathBoundAssertReport;
import com.helger.schematron.pure.bound.xpath.PSXPathBoundDiagnostic;
import com.helger.schematron.pure.bound.xpath.PSXPathBoundElement;
import com.helger.schematron.pure.errorhandler.IPSErrorHandler;
import com.helger.schematron.pure.model.IPSElement;
import com.helger.schematron.pure.model.PSAssertReport;
import com.helger.schematron.pure.model.PSDiagnostics;
import com.helger.schematron.pure.model.PSDir;
import com.helger.schematron.pure.model.PSEmph;
import com.helger.schematron.pure.model.PSName;
import com.helger.schematron.pure.model.PSPattern;
import com.helger.schematron.pure.model.PSPhase;
import com.helger.schematron.pure.model.PSRule;
import com.helger.schematron.pure.model.PSSchema;
import com.helger.schematron.pure.model.PSSpan;
import com.helger.schematron.pure.model.PSTitle;
import com.helger.schematron.pure.model.PSValueOf;
import com.helger.schematron.pure.validation.PSValidationHandlerDefault;
import com.helger.schematron.pure.validation.SchematronValidationException;
import com.helger.xml.XMLHelper;
/**
* A special validation handler that creates an SVRL document. This class only
* works for the XPath binding, as the special {@link PSXPathBoundAssertReport}
* class is referenced!
*
* @author Philip Helger
*/
@NotThreadSafe
public class PSXPathValidationHandlerSVRL extends PSValidationHandlerDefault
{
private final IPSErrorHandler m_aErrorHandler;
private SchematronOutputType m_aSchematronOutput;
private PSSchema m_aSchema;
/**
* Constructor
*
* @param aErrorHandler
* The error handler to be used. May not be null.
*/
public PSXPathValidationHandlerSVRL (@Nonnull final IPSErrorHandler aErrorHandler)
{
ValueEnforcer.notNull (aErrorHandler, "ErrorHandler");
m_aErrorHandler = aErrorHandler;
}
private void _warn (@Nonnull final IPSElement aSourceElement, @Nonnull final String sMsg)
{
if (m_aSchema == null)
throw new IllegalStateException ("No schema is present!");
m_aErrorHandler.warn (m_aSchema.getResource (), aSourceElement, sMsg);
}
private void _error (@Nonnull final IPSElement aSourceElement,
@Nonnull final String sMsg,
@Nullable final Throwable t)
{
if (m_aSchema == null)
throw new IllegalStateException ("No schema is present!");
m_aErrorHandler.error (m_aSchema.getResource (), aSourceElement, sMsg, t);
}
@Nullable
private static String _getTitleAsString (@Nullable final PSTitle aTitle) throws SchematronValidationException
{
if (aTitle == null)
return null;
final StringBuilder aSB = new StringBuilder ();
for (final Object aContent : aTitle.getAllContentElements ())
{
if (aContent instanceof String)
aSB.append ((String) aContent);
else
if (aContent instanceof PSDir)
aSB.append (((PSDir) aContent).getAsText ());
else
throw new SchematronValidationException ("Unsupported title content element: " + aContent);
}
return aSB.toString ();
}
@Override
public void onStart (@Nonnull final PSSchema aSchema,
@Nullable final PSPhase aActivePhase) throws SchematronValidationException
{
final SchematronOutputType aSchematronOutput = new SchematronOutputType ();
if (aActivePhase != null)
aSchematronOutput.setPhase (aActivePhase.getID ());
aSchematronOutput.setSchemaVersion (aSchema.getSchemaVersion ());
aSchematronOutput.setTitle (_getTitleAsString (aSchema.getTitle ()));
// Add namespace prefixes
for (final Map.Entry aEntry : aSchema.getAsNamespaceContext ()
.getPrefixToNamespaceURIMap ()
.entrySet ())
{
final NsPrefixInAttributeValues aNsPrefix = new NsPrefixInAttributeValues ();
aNsPrefix.setPrefix (aEntry.getKey ());
aNsPrefix.setUri (aEntry.getValue ());
aSchematronOutput.getNsPrefixInAttributeValues ().add (aNsPrefix);
}
m_aSchematronOutput = aSchematronOutput;
m_aSchema = aSchema;
}
@Override
public void onPattern (@Nonnull final PSPattern aPattern)
{
final ActivePattern aRetPattern = new ActivePattern ();
// TODO document
aRetPattern.setId (aPattern.getID ());
// TODO name
// TODO role
m_aSchematronOutput.getActivePatternAndFiredRuleAndFailedAssert ().add (aRetPattern);
}
@Override
public void onRule (@Nonnull final PSRule aRule, @Nonnull final String sContext)
{
final FiredRule aRetRule = new FiredRule ();
aRetRule.setContext (sContext);
aRetRule.setFlag (aRule.getFlag ());
aRetRule.setId (aRule.getID ());
// TODO role
m_aSchematronOutput.getActivePatternAndFiredRuleAndFailedAssert ().add (aRetRule);
}
/**
* Get the error text from an assert or report element.
*
* @param aBoundContentElements
* The list of bound elements to be evaluated.
* @param aSourceNode
* The XML node of the document currently validated.
* @return A non-null String
* @throws SchematronValidationException
* In case evaluating an XPath expression fails.
*/
@Nonnull
private String _getErrorText (@Nonnull final List aBoundContentElements,
@Nonnull final Node aSourceNode) throws SchematronValidationException
{
final StringBuilder aSB = new StringBuilder ();
for (final PSXPathBoundElement aBoundElement : aBoundContentElements)
{
final Object aContent = aBoundElement.getElement ();
if (aContent instanceof String)
aSB.append ((String) aContent);
else
if (aContent instanceof PSName)
{
final PSName aName = (PSName) aContent;
if (aName.hasPath ())
{
// XPath present
try
{
aSB.append ((String) aBoundElement.getBoundExpression ().evaluate (aSourceNode, XPathConstants.STRING));
}
catch (final XPathExpressionException ex)
{
_error (aName,
"Failed to evaluate XPath expression to a string: '" + aBoundElement.getExpression () + "'",
ex);
// Append the path so that something is present in the output
aSB.append (aName.getPath ());
}
}
else
{
// No XPath present
aSB.append (aSourceNode.getNodeName ());
}
}
else
if (aContent instanceof PSValueOf)
{
final PSValueOf aValueOf = (PSValueOf) aContent;
try
{
aSB.append ((String) aBoundElement.getBoundExpression ().evaluate (aSourceNode, XPathConstants.STRING));
}
catch (final XPathExpressionException ex)
{
_error (aValueOf,
"Failed to evaluate XPath expression to a string: '" + aBoundElement.getExpression () + "'",
ex);
// Append the path so that something is present in the output
aSB.append (aValueOf.getSelect ());
}
}
else
if (aContent instanceof PSEmph)
aSB.append (((PSEmph) aContent).getAsText ());
else
if (aContent instanceof PSDir)
aSB.append (((PSDir) aContent).getAsText ());
else
if (aContent instanceof PSSpan)
aSB.append (((PSSpan) aContent).getAsText ());
else
throw new SchematronValidationException ("Unsupported assert/report content element: " + aContent);
}
return aSB.toString ();
}
/**
* Handle the diagnostic references of a single assert/report element
*
* @param aSrcDiagnostics
* The list of diagnostic reference IDs in the source assert/report
* element. May be null if no diagnostic references are
* present
* @param aDstList
* The diagnostic reference list of the SchematronOutput to be filled.
* May not be null.
* @param aBoundAssertReport
* The bound assert report element. Never null.
* @param aRuleMatchingNode
* The XML node of the XML document currently validated. Never
* null.
* @throws SchematronValidationException
*/
private void _handleDiagnosticReferences (@Nullable final List aSrcDiagnostics,
@Nonnull final List aDstList,
@Nonnull final PSXPathBoundAssertReport aBoundAssertReport,
@Nonnull final Node aRuleMatchingNode) throws SchematronValidationException
{
if (CollectionHelper.isNotEmpty (aSrcDiagnostics))
{
if (m_aSchema.hasDiagnostics ())
{
final PSDiagnostics aDiagnostics = m_aSchema.getDiagnostics ();
for (final String sDiagnosticID : aSrcDiagnostics)
{
final PSXPathBoundDiagnostic aDiagnostic = aBoundAssertReport.getBoundDiagnosticOfID (sDiagnosticID);
if (aDiagnostic == null)
_warn (aDiagnostics, "Failed to resolve diagnostics with ID '" + sDiagnosticID + "'");
else
{
// Create the SVRL diagnostic-reference element
final DiagnosticReference aDR = new DiagnosticReference ();
aDR.setDiagnostic (sDiagnosticID);
aDR.setText (_getErrorText (aDiagnostic.getAllBoundContentElements (), aRuleMatchingNode));
aDstList.add (aDR);
}
}
}
else
_warn (m_aSchema, "Failed to resolve diagnostic because schema has no diagnostics");
}
}
@Nonnull
private static String _getPathToNode (@Nonnull final Node aNode)
{
return XMLHelper.getPathToNode2 (aNode, "/");
}
@Override
@Nonnull
public EContinue onFailedAssert (@Nonnull final PSAssertReport aAssertReport,
@Nonnull final String sTestExpression,
@Nonnull final Node aRuleMatchingNode,
final int nNodeIndex,
@Nullable final Object aContext) throws SchematronValidationException
{
if (!(aContext instanceof PSXPathBoundAssertReport))
throw new SchematronValidationException ("The passed context must be an XPath object but is a " + aContext);
final PSXPathBoundAssertReport aBoundAssertReport = (PSXPathBoundAssertReport) aContext;
final FailedAssert aFailedAssert = new FailedAssert ();
aFailedAssert.setFlag (aAssertReport.getFlag ());
aFailedAssert.setId (aAssertReport.getID ());
aFailedAssert.setLocation (_getPathToNode (aRuleMatchingNode));
// TODO role
aFailedAssert.setTest (sTestExpression);
aFailedAssert.setText (_getErrorText (aBoundAssertReport.getAllBoundContentElements (), aRuleMatchingNode));
_handleDiagnosticReferences (aAssertReport.getAllDiagnostics (),
aFailedAssert.getDiagnosticReference (),
aBoundAssertReport,
aRuleMatchingNode);
m_aSchematronOutput.getActivePatternAndFiredRuleAndFailedAssert ().add (aFailedAssert);
return EContinue.CONTINUE;
}
@Override
@Nonnull
public EContinue onSuccessfulReport (@Nonnull final PSAssertReport aAssertReport,
@Nonnull final String sTestExpression,
@Nonnull final Node aRuleMatchingNode,
final int nNodeIndex,
@Nullable final Object aContext) throws SchematronValidationException
{
if (!(aContext instanceof PSXPathBoundAssertReport))
throw new SchematronValidationException ("The passed context must be an XPath object but is a " + aContext);
final PSXPathBoundAssertReport aBoundAssertReport = (PSXPathBoundAssertReport) aContext;
final SuccessfulReport aSuccessfulReport = new SuccessfulReport ();
aSuccessfulReport.setFlag (aAssertReport.getFlag ());
aSuccessfulReport.setId (aAssertReport.getID ());
aSuccessfulReport.setLocation (_getPathToNode (aRuleMatchingNode));
// TODO role
aSuccessfulReport.setTest (sTestExpression);
aSuccessfulReport.setText (_getErrorText (aBoundAssertReport.getAllBoundContentElements (), aRuleMatchingNode));
_handleDiagnosticReferences (aAssertReport.getAllDiagnostics (),
aSuccessfulReport.getDiagnosticReference (),
aBoundAssertReport,
aRuleMatchingNode);
m_aSchematronOutput.getActivePatternAndFiredRuleAndFailedAssert ().add (aSuccessfulReport);
return EContinue.CONTINUE;
}
@Nullable
public SchematronOutputType getSVRL ()
{
return m_aSchematronOutput;
}
}
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