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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.bound;
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import javax.annotation.concurrent.Immutable;
import javax.xml.xpath.XPathFunctionResolver;
import javax.xml.xpath.XPathVariableResolver;
import org.xml.sax.EntityResolver;
import com.helger.commons.ValueEnforcer;
import com.helger.commons.annotation.OverrideOnDemand;
import com.helger.commons.equals.EqualsHelper;
import com.helger.commons.hashcode.HashCodeGenerator;
import com.helger.commons.hashcode.IHashCodeGenerator;
import com.helger.commons.io.resource.IReadableResource;
import com.helger.commons.string.ToStringGenerator;
import com.helger.schematron.SchematronException;
import com.helger.schematron.pure.binding.IPSQueryBinding;
import com.helger.schematron.pure.binding.PSQueryBindingRegistry;
import com.helger.schematron.pure.errorhandler.IPSErrorHandler;
import com.helger.schematron.pure.exchange.PSReader;
import com.helger.schematron.pure.model.PSSchema;
import com.helger.schematron.pure.preprocess.PSPreprocessor;
import com.helger.schematron.pure.preprocess.SchematronPreprocessException;
import com.helger.xml.microdom.serialize.MicroWriter;
/**
* This class represents keys for the {@link PSBoundSchemaCache}. It is a
* combination of a resource and a phase. It is the responsible class for
* reading and binding a Schematron resource.
*
* @author Philip Helger
*/
@Immutable
public class PSBoundSchemaCacheKey
{
private final IReadableResource m_aResource;
private final String m_sPhase;
private final IPSErrorHandler m_aErrorHandler;
private final XPathVariableResolver m_aVariableResolver;
private final XPathFunctionResolver m_aFunctionResolver;
private final EntityResolver m_aEntityResolver;
// Status vars
private transient int m_nHashCode = IHashCodeGenerator.ILLEGAL_HASHCODE;
public PSBoundSchemaCacheKey (@Nonnull final IReadableResource aResource,
@Nullable final String sPhase,
@Nullable final IPSErrorHandler aErrorHandler,
@Nullable final XPathVariableResolver aVariableResolver,
@Nullable final XPathFunctionResolver aFunctionResolver,
@Nullable final EntityResolver aEntityResolver)
{
ValueEnforcer.notNull (aResource, "Resource");
m_aResource = aResource;
m_sPhase = sPhase;
m_aErrorHandler = aErrorHandler;
m_aVariableResolver = aVariableResolver;
m_aFunctionResolver = aFunctionResolver;
m_aEntityResolver = aEntityResolver;
}
/**
* @return The resource passed in the constructor. Never null.
*/
@Nonnull
public final IReadableResource getResource ()
{
return m_aResource;
}
/**
* @return The phase selected in the constructor. May be null.
*/
@Nullable
public final String getPhase ()
{
return m_sPhase;
}
/**
* @return The error handler passed in the constructor. May be
* null.
*/
@Nullable
public final IPSErrorHandler getErrorHandler ()
{
return m_aErrorHandler;
}
/**
* @return The variable resolver to be used. May be null.
*/
@Nullable
public final XPathVariableResolver getVariableResolver ()
{
return m_aVariableResolver;
}
/**
* @return The function resolver to be used. May be null.
*/
@Nullable
public final XPathFunctionResolver getFunctionResolver ()
{
return m_aFunctionResolver;
}
/**
* @return The XML entity resolver to be used. May be null.
*/
@Nullable
public final EntityResolver getEntityResolver ()
{
return m_aEntityResolver;
}
/**
* Read the specified schema from the passed resource.
*
* @param aResource
* The resource to read from. Never null.
* @param aErrorHandler
* The error handler to use. May be null.
* @param aEntityResolver
* The XML entity resolver to be used. May be null.
* @return The read schema. May not be null.
* @throws SchematronException
* In case there is an error reading.
*/
@Nonnull
@OverrideOnDemand
public PSSchema readSchema (@Nonnull final IReadableResource aResource,
@Nullable final IPSErrorHandler aErrorHandler,
@Nullable final EntityResolver aEntityResolver) throws SchematronException
{
return new PSReader (aResource, aErrorHandler, aEntityResolver).readSchema ();
}
/**
* Determine the query binding for the read schema.
*
* @param aSchema
* The read schema. Never null.
* @return The query binding to use. Never null.
* @throws SchematronException
* In case the determination fails.
*/
@Nonnull
@OverrideOnDemand
public IPSQueryBinding getQueryBinding (@Nonnull final PSSchema aSchema) throws SchematronException
{
return PSQueryBindingRegistry.getQueryBindingOfNameOrThrow (aSchema.getQueryBinding ());
}
/**
* Create the pre-processor to be used for
* {@link #createPreprocessedSchema(PSSchema, IPSQueryBinding)}.
*
* @param aQueryBinding
* The query binding to be determined from the read schema. Never
* null.
* @return The pre-processor to be used.
*/
@Nonnull
@OverrideOnDemand
public PSPreprocessor createPreprocessor (@Nonnull final IPSQueryBinding aQueryBinding)
{
final PSPreprocessor aPreprocessor = PSPreprocessor.createPreprocessorWithoutInformationLoss (aQueryBinding);
return aPreprocessor;
}
/**
* Pre-process the read schema, using the determined query binding.
*
* @param aSchema
* The read schema. Never null.
* @param aQueryBinding
* The determined query binding. Never null.
* @return The pre-processed schema and never null.
* @throws SchematronException
* In case pre-processing fails
*/
@Nonnull
@OverrideOnDemand
public PSSchema createPreprocessedSchema (@Nonnull final PSSchema aSchema,
@Nonnull final IPSQueryBinding aQueryBinding) throws SchematronException
{
final PSPreprocessor aPreprocessor = createPreprocessor (aQueryBinding);
final PSSchema aPreprocessedSchema = aPreprocessor.getAsPreprocessedSchema (aSchema);
if (aPreprocessedSchema == null)
throw new SchematronPreprocessException ("Failed to preprocess schema " +
aSchema +
" with query binding " +
aQueryBinding);
if (false)
System.out.println ("PREPROC:\n" + MicroWriter.getNodeAsString (aPreprocessedSchema.getAsMicroElement ()));
return aPreprocessedSchema;
}
/**
* The main routine to create a bound schema from the passed resource and
* phase. The usual routine is to
*
* - read the schema from the resource - see
* {@link #readSchema(IReadableResource, IPSErrorHandler, EntityResolver)}
* - resolve the query binding - see {@link #getQueryBinding(PSSchema)}
* - pre-process the schema -
* {@link #createPreprocessedSchema(PSSchema, IPSQueryBinding)}
* - and finally bind it -
* {@link IPSQueryBinding#bind(PSSchema, String, IPSErrorHandler, javax.xml.xpath.XPathVariableResolver, javax.xml.xpath.XPathFunctionResolver)}
*
*
*
* @return The bound schema. Never null.
* @throws SchematronException
* In case reading or binding fails.
*/
@Nonnull
public IPSBoundSchema createBoundSchema () throws SchematronException
{
// Read schema from resource
final PSSchema aSchema = readSchema (getResource (), getErrorHandler (), getEntityResolver ());
// Resolve the query binding to be used
final IPSQueryBinding aQueryBinding = getQueryBinding (aSchema);
// Pre-process schema
final PSSchema aPreprocessedSchema = createPreprocessedSchema (aSchema, aQueryBinding);
// And finally bind the pre-processed schema
return aQueryBinding.bind (aPreprocessedSchema,
getPhase (),
getErrorHandler (),
getVariableResolver (),
getFunctionResolver ());
}
@Override
public boolean equals (final Object o)
{
if (o == this)
return true;
if (o == null || !getClass ().equals (o.getClass ()))
return false;
final PSBoundSchemaCacheKey rhs = (PSBoundSchemaCacheKey) o;
return m_aResource.equals (rhs.m_aResource) &&
EqualsHelper.equals (m_sPhase, rhs.m_sPhase) &&
EqualsHelper.equals (m_aVariableResolver, rhs.m_aVariableResolver) &&
EqualsHelper.equals (m_aFunctionResolver, rhs.m_aFunctionResolver);
}
@Override
public int hashCode ()
{
int ret = m_nHashCode;
if (ret == IHashCodeGenerator.ILLEGAL_HASHCODE)
ret = m_nHashCode = new HashCodeGenerator (this).append (m_aResource)
.append (m_sPhase)
.append (m_aVariableResolver)
.append (m_aFunctionResolver)
.getHashCode ();
return ret;
}
@Override
public String toString ()
{
return new ToStringGenerator (this).append ("resource", m_aResource)
.append ("phase", m_sPhase)
.appendIfNotNull ("errorHandler", m_aErrorHandler)
.appendIfNotNull ("variableResolver", m_aVariableResolver)
.appendIfNotNull ("functionResolver", m_aFunctionResolver)
.getToString ();
}
}
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