/* * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You 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. */ // $Id: SchemaFactory.java 884952 2009-11-27 18:55:08Z mrglavas $ package javax.xml.validation; import java.io.File; import java.net.URL; import javax.xml.transform.Source; import javax.xml.transform.stream.StreamSource; import org.w3c.dom.ls.LSResourceResolver; import org.xml.sax.ErrorHandler; import org.xml.sax.SAXException; import org.xml.sax.SAXNotRecognizedException; import org.xml.sax.SAXNotSupportedException; /** * Factory that creates {@link Schema} objects. Entry-point to * the validation API. * *

* {@link SchemaFactory} is a schema compiler. It reads external * representations of schemas and prepares them for validation. * *

* The {@link SchemaFactory} class is not thread-safe. In other words, * it is the application's responsibility to ensure that at most * one thread is using a {@link SchemaFactory} object at any * given moment. Implementations are encouraged to mark methods * as synchronized to protect themselves from broken clients. * *

* {@link SchemaFactory} is not re-entrant. While one of the * newSchema methods is being invoked, applications * may not attempt to recursively invoke the newSchema method, * even from the same thread. * *

Schema Language

*

* This spec uses a namespace URI to designate a schema language. * The following table shows the values defined by this specification. *

* To be compliant with the spec, the implementation * is only required to support W3C XML Schema 1.0. However, * if it chooses to support other schema languages listed here, * it must conform to the relevant behaviors described in this spec. * *

* Schema languages not listed here are expected to * introduce their own URIs to represent themselves. * The {@link SchemaFactory} class is capable of locating other * implementations for other schema languages at run-time. * *

* Note that because the XML DTD is strongly tied to the parsing process * and has a significant effect on the parsing process, it is impossible * to define the DTD validation as a process independent from parsing. * For this reason, this specification does not define the semantics for * the XML DTD. This doesn't prohibit implementers from implementing it * in a way they see fit, but users are warned that any DTD * validation implemented on this interface necessarily deviate from * the XML DTD semantics as defined in the XML 1.0. * * * * * * * * * * * * * * * * * * *
valuelanguage
{@link javax.xml.XMLConstants#W3C_XML_SCHEMA_NS_URI} ("http://www.w3.org/2001/XMLSchema")W3C XML Schema 1.0
{@link javax.xml.XMLConstants#RELAXNG_NS_URI} ("http://relaxng.org/ns/structure/1.0")RELAX NG 1.0
* * @author Kohsuke Kawaguchi * @version $Revision: 884952 $, $Date: 2009-11-27 10:55:08 -0800 (Fri, 27 Nov 2009) $ * @since 1.5 */ public abstract class SchemaFactory { /** *

Constructor for derived classes.

* *

The constructor does nothing.

* *

Derived classes must create {@link SchemaFactory} objects that have * null {@link ErrorHandler} and * null {@link LSResourceResolver}.

*/ protected SchemaFactory() { } /** *

Lookup an implementation of the SchemaFactory that supports the specified * schema language and return it.

* *

To find a SchemaFactory object for a given schema language, * this method looks the following places in the following order * where "the class loader" refers to the context class loader:

*
    *
  1. * If the system property * "javax.xml.validation.SchemaFactory:schemaLanguage" * is present (where schemaLanguage is the parameter * to this method), then its value is read * as a class name. The method will try to * create a new instance of this class by using the class loader, * and returns it if it is successfully created. *
    2. *
  2. * $java.home/lib/jaxp.properties is read and * the value associated with the key being the system property above * is looked for. If present, the value is processed just like above. *
    3. *
  3. *

    The class loader is asked for service provider provider-configuration files matching * javax.xml.validation.SchemaFactory in the resource directory META-INF/services. * See the JAR File Specification for file format and parsing rules. * Each potential service provider is required to implement the method:

    * 
         *        {@link #isSchemaLanguageSupported(String schemaLanguage)}
     *
    * The first service provider found in class loader order that supports the specified schema language is returned. *
    4. *
  4. * Platform default SchemaFactory is located * in a implementation specific way. There must be a platform default * SchemaFactory for W3C XML Schema. *
    5. *
* *

If everything fails, {@link IllegalArgumentException} will be thrown.

* *

Tip for Trouble-shooting:

*

See {@link java.util.Properties#load(java.io.InputStream)} for * exactly how a property file is parsed. In particular, colons ':' * need to be escaped in a property file, so make sure schema language * URIs are properly escaped in it. For example:

* 
     * http\://www.w3.org/2001/XMLSchema=org.acme.foo.XSSchemaFactory
     *
* * @param schemaLanguage * Specifies the schema language which the returned * SchemaFactory will understand. See * the list of available * schema languages for the possible values. * * @return New instance of a SchemaFactory * * @throws IllegalArgumentException * If no implementation of the schema language is available. * * @throws NullPointerException * If the schemaLanguage parameter is null. */ public static SchemaFactory newInstance(String schemaLanguage) { ClassLoader cl; cl = Thread.currentThread().getContextClassLoader(); if (cl == null) { //cl = ClassLoader.getSystemClassLoader(); //use the current class loader cl = SchemaFactory.class.getClassLoader(); } SchemaFactory f = new SchemaFactoryFinder(cl).newFactory(schemaLanguage); if (f == null) { throw new IllegalArgumentException(schemaLanguage); } return f; } /** * Returns an instance of the named implementation of {@code SchemaFactory}. * * @throws IllegalArgumentException if {@code factoryClassName} is not available, cannot be * instantiated, or doesn't support {@code schemaLanguage}. * @since 1.6 */ public static SchemaFactory newInstance(String schemaLanguage, String factoryClassName, ClassLoader classLoader) { if (schemaLanguage == null) { throw new NullPointerException("schemaLanguage == null"); } else if (factoryClassName == null) { throw new NullPointerException("factoryClassName == null"); } if (classLoader == null) { classLoader = Thread.currentThread().getContextClassLoader(); } try { Class type = classLoader != null ? classLoader.loadClass(factoryClassName) : Class.forName(factoryClassName); SchemaFactory result = (SchemaFactory) type.newInstance(); if (result == null || !result.isSchemaLanguageSupported(schemaLanguage)) { throw new IllegalArgumentException(schemaLanguage); } return result; } catch (ClassNotFoundException e) { throw new IllegalArgumentException(e); } catch (InstantiationException e) { throw new IllegalArgumentException(e); } catch (IllegalAccessException e) { throw new IllegalArgumentException(e); } } /** *

Is specified schema supported by this SchemaFactory?

* * @param schemaLanguage Specifies the schema language which the returned SchemaFactory will understand. * schemaLanguage must specify a valid schema language. * * @return true if SchemaFactory supports schemaLanguage, else false. * * @throws NullPointerException If schemaLanguage is null. * @throws IllegalArgumentException If schemaLanguage.length() == 0 * or schemaLanguage does not specify a valid schema language. */ public abstract boolean isSchemaLanguageSupported(String schemaLanguage); /** * Look up the value of a feature flag. * *

The feature name is any fully-qualified URI. It is * possible for a {@link SchemaFactory} to recognize a feature name but * temporarily be unable to return its value. * *

Implementers are free (and encouraged) to invent their own features, * using names built on their own URIs.

* * @param name The feature name, which is a non-null fully-qualified URI. * @return The current value of the feature (true or false). * @exception org.xml.sax.SAXNotRecognizedException If the feature * value can't be assigned or retrieved. * @exception org.xml.sax.SAXNotSupportedException When the * {@link SchemaFactory} recognizes the feature name but * cannot determine its value at this time. * @exception NullPointerException * if the name parameter is null. * @see #setFeature(String, boolean) */ public boolean getFeature(String name) throws SAXNotRecognizedException, SAXNotSupportedException { if (name == null) { throw new NullPointerException("name == null"); } throw new SAXNotRecognizedException(name); } /** * Set the value of a feature flag. * *

* Feature can be used to control the way a {@link SchemaFactory} * parses schemas, although {@link SchemaFactory}s are not required * to recognize any specific feature names.

* *

The feature name is any fully-qualified URI. It is * possible for a {@link SchemaFactory} to expose a feature value but * to be unable to change the current value.

* *

All implementations are required to support the {@link javax.xml.XMLConstants#FEATURE_SECURE_PROCESSING} feature. * When the feature is:

* * * @param name The feature name, which is a non-null fully-qualified URI. * @param value The requested value of the feature (true or false). * * @exception org.xml.sax.SAXNotRecognizedException If the feature * value can't be assigned or retrieved. * @exception org.xml.sax.SAXNotSupportedException When the * {@link SchemaFactory} recognizes the feature name but * cannot set the requested value. * @exception NullPointerException * if the name parameter is null. * * @see #getFeature(String) */ public void setFeature(String name, boolean value) throws SAXNotRecognizedException, SAXNotSupportedException { if (name == null) { throw new NullPointerException("name == null"); } throw new SAXNotRecognizedException(name); } /** * Set the value of a property. * *

The property name is any fully-qualified URI. It is * possible for a {@link SchemaFactory} to recognize a property name but * to be unable to change the current value.

* *

{@link SchemaFactory}s are not required to recognize setting * any specific property names.

* * @param name The property name, which is a non-null fully-qualified URI. * @param object The requested value for the property. * @exception org.xml.sax.SAXNotRecognizedException If the property * value can't be assigned or retrieved. * @exception org.xml.sax.SAXNotSupportedException When the * {@link SchemaFactory} recognizes the property name but * cannot set the requested value. * @exception NullPointerException * if the name parameter is null. */ public void setProperty(String name, Object object) throws SAXNotRecognizedException, SAXNotSupportedException { if (name == null) { throw new NullPointerException("name == null"); } throw new SAXNotRecognizedException(name); } /** * Look up the value of a property. * *

The property name is any fully-qualified URI. It is * possible for a {@link SchemaFactory} to recognize a property name but * temporarily be unable to return its value.

* *

{@link SchemaFactory}s are not required to recognize any specific * property names.

* *

Implementers are free (and encouraged) to invent their own properties, * using names built on their own URIs.

* * @param name The property name, which is a non-null fully-qualified URI. * @return The current value of the property. * @exception org.xml.sax.SAXNotRecognizedException If the property * value can't be assigned or retrieved. * @exception org.xml.sax.SAXNotSupportedException When the * XMLReader recognizes the property name but * cannot determine its value at this time. * @exception NullPointerException * if the name parameter is null. * @see #setProperty(String, Object) */ public Object getProperty(String name) throws SAXNotRecognizedException, SAXNotSupportedException { if (name == null) { throw new NullPointerException("name == null"); } throw new SAXNotRecognizedException(name); } /** * Sets the {@link ErrorHandler} to receive errors encountered * during the newSchema method invocation. * *

* Error handler can be used to customize the error handling process * during schema parsing. When an {@link ErrorHandler} is set, * errors found during the parsing of schemas will be first sent * to the {@link ErrorHandler}. * *

* The error handler can abort the parsing of a schema immediately * by throwing {@link SAXException} from the handler. Or for example * it can print an error to the screen and try to continue the * processing by returning normally from the {@link ErrorHandler} * *

* If any {@link Throwable} (or instances of its derived classes) * is thrown from an {@link ErrorHandler}, * the caller of the newSchema method will be thrown * the same {@link Throwable} object. * *

* {@link SchemaFactory} is not allowed to * throw {@link SAXException} without first reporting it to * {@link ErrorHandler}. * *

* Applications can call this method even during a {@link Schema} * is being parsed. * *

* When the {@link ErrorHandler} is null, the implementation will * behave as if the following {@link ErrorHandler} is set: * 

     * class DraconianErrorHandler implements {@link ErrorHandler} {
     *     public void fatalError( {@link org.xml.sax.SAXParseException} e ) throws {@link SAXException} {
     *         throw e;
     *     }
     *     public void error( {@link org.xml.sax.SAXParseException} e ) throws {@link SAXException} {
     *         throw e;
     *     }
     *     public void warning( {@link org.xml.sax.SAXParseException} e ) throws {@link SAXException} {
     *         // noop
     *     }
     * }
     *
* *

* When a new {@link SchemaFactory} object is created, initially * this field is set to null. This field will NOT be * inherited to {@link Schema}s, {@link Validator}s, or * {@link ValidatorHandler}s that are created from this {@link SchemaFactory}. * * * @param errorHandler * A new error handler to be set. This parameter can be null. */ public abstract void setErrorHandler(ErrorHandler errorHandler); /** * Gets the current {@link ErrorHandler} set to this {@link SchemaFactory}. * * @return * This method returns the object that was last set through * the {@link #setErrorHandler(ErrorHandler)} method, or null * if that method has never been called since this {@link SchemaFactory} * has created. * * @see #setErrorHandler(ErrorHandler) */ public abstract ErrorHandler getErrorHandler(); /** * Sets the {@link LSResourceResolver} to customize * resource resolution when parsing schemas. * *

* {@link SchemaFactory} uses a {@link LSResourceResolver} * when it needs to locate external resources while parsing schemas, * although exactly what constitutes "locating external resources" is * up to each schema language. For example, for W3C XML Schema, * this includes files <include>d or <import>ed, * and DTD referenced from schema files, etc. * *

* Applications can call this method even during a {@link Schema} * is being parsed. * *

* When the {@link LSResourceResolver} is null, the implementation will * behave as if the following {@link LSResourceResolver} is set: * 

     * class DumbDOMResourceResolver implements {@link LSResourceResolver} {
     *     public {@link org.w3c.dom.ls.LSInput} resolveResource(
     *         String publicId, String systemId, String baseURI) {
     *
     *         return null; // always return null
     *     }
     * }
     *
* *

* If a {@link LSResourceResolver} throws a {@link RuntimeException} * (or instances of its derived classes), * then the {@link SchemaFactory} will abort the parsing and * the caller of the newSchema method will receive * the same {@link RuntimeException}. * *

* When a new {@link SchemaFactory} object is created, initially * this field is set to null. This field will NOT be * inherited to {@link Schema}s, {@link Validator}s, or * {@link ValidatorHandler}s that are created from this {@link SchemaFactory}. * * @param resourceResolver * A new resource resolver to be set. This parameter can be null. */ public abstract void setResourceResolver(LSResourceResolver resourceResolver); /** * Gets the current {@link LSResourceResolver} set to this {@link SchemaFactory}. * * @return * This method returns the object that was last set through * the {@link #setResourceResolver(LSResourceResolver)} method, or null * if that method has never been called since this {@link SchemaFactory} * has created. * * @see #setErrorHandler(ErrorHandler) */ public abstract LSResourceResolver getResourceResolver(); /** *

Parses the specified source as a schema and returns it as a schema.

* *

This is a convenience method for {@link #newSchema(Source[] schemas)}.

* * @param schema Source that represents a schema. * * @return New Schema from parsing schema. * * @throws SAXException If a SAX error occurs during parsing. * @throws NullPointerException if schema is null. */ public Schema newSchema(Source schema) throws SAXException { return newSchema(new Source[]{schema}); } /** *

Parses the specified File as a schema and returns it as a Schema.

* *

This is a convenience method for {@link #newSchema(Source schema)}.

* * @param schema File that represents a schema. * * @return New Schema from parsing schema. * * @throws SAXException If a SAX error occurs during parsing. * @throws NullPointerException if schema is null. */ public Schema newSchema(File schema) throws SAXException { return newSchema(new StreamSource(schema)); } /** *

Parses the specified URL as a schema and returns it as a Schema.

* *

This is a convenience method for {@link #newSchema(Source schema)}.

* * @param schema URL that represents a schema. * * @return New Schema from parsing schema. * * @throws SAXException If a SAX error occurs during parsing. * @throws NullPointerException if schema is null. */ public Schema newSchema(URL schema) throws SAXException { return newSchema(new StreamSource(schema.toExternalForm())); } /** * Parses the specified source(s) as a schema and returns it as a schema. * *

* The callee will read all the {@link Source}s and combine them into a * single schema. The exact semantics of the combination depends on the schema * language that this {@link SchemaFactory} object is created for. * *

* When an {@link ErrorHandler} is set, the callee will report all the errors * found in sources to the handler. If the handler throws an exception, it will * abort the schema compilation and the same exception will be thrown from * this method. Also, after an error is reported to a handler, the callee is allowed * to abort the further processing by throwing it. If an error handler is not set, * the callee will throw the first error it finds in the sources. * *

W3C XML Schema 1.0

*

* The resulting schema contains components from the specified sources. * The same result would be achieved if all these sources were * imported, using appropriate values for schemaLocation and namespace, * into a single schema document with a different targetNamespace * and no components of its own, if the import elements were given * in the same order as the sources. Section 4.2.3 of the XML Schema * recommendation describes the options processors have in this * regard. While a processor should be consistent in its treatment of * JAXP schema sources and XML Schema imports, the behavior between * JAXP-compliant parsers may vary; in particular, parsers may choose * to ignore all but the first <import> for a given namespace, * regardless of information provided in schemaLocation. * *

* If the parsed set of schemas includes error(s) as * specified in the section 5.1 of the XML Schema spec, then * the error must be reported to the {@link ErrorHandler}. * *

RELAX NG

* *

For RELAX NG, this method must throw {@link UnsupportedOperationException} * if schemas.length!=1. * * * @param schemas * inputs to be parsed. {@link SchemaFactory} is required * to recognize {@link StreamSource}, * {@link javax.xml.transform.sax.SAXSource}, * and {@link javax.xml.transform.dom.DOMSource}. * * @return * Always return a non-null valid {@link Schema} object. * Note that when an error has been reported, there is no * guarantee that the returned {@link Schema} object is * meaningful. * * @throws SAXException * If an error is found during processing the specified inputs. * When an {@link ErrorHandler} is set, errors are reported to * there first. See {@link #setErrorHandler(ErrorHandler)}. * @throws NullPointerException * If the schemas parameter itself is null or * any item in the array is null. * @throws IllegalArgumentException * If any item in the array is not recognized by this method. * @throws UnsupportedOperationException * If the schema language doesn't support this operation. */ public abstract Schema newSchema(Source[] schemas) throws SAXException; /** * Creates a special {@link Schema} object. * *

* The exact semantics of the returned {@link Schema} object depends * on the schema language that this {@link SchemaFactory} is created * for. * *

* Also, implementations are allowed to use implementation-specific * property/feature to alter the semantics of this method. * * *

W3C XML Schema 1.0

*

* For XML Schema, this method creates a {@link Schema} object that * performs validation by using location hints specified in documents. * *

* The returned {@link Schema} object assumes that if documents * refer to the same URL in the schema location hints, * they will always resolve to the same schema document. This * assumption allows implementations to reuse parsed results of * schema documents so that multiple validations against the same * schema will run faster. * *

* Note that the use of schema location hints introduces a * vulnerability to denial-of-service attacks. * * *

RELAX NG

*

* RELAX NG does not support this operation. * * @return * Always return non-null valid {@link Schema} object. * * @throws UnsupportedOperationException * If this operation is not supported by the callee. * @throws SAXException * If this operation is supported but failed for some reason. */ public abstract Schema newSchema() throws SAXException; }