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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* published by the Free Software Foundation. Oracle designates this
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*
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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package javax.xml.validation;
import java.io.IOException;
import javax.xml.transform.Result;
import javax.xml.transform.Source;
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;
/**
* A processor that checks an XML document against {@link Schema}.
*
* <p>
* A validator object is not thread-safe and not reentrant.
* In other words, it is the application's responsibility to make
* sure that one {@link Validator} object is not used from
* more than one thread at any given time, and while the {@code validate}
* method is invoked, applications may not recursively call
* the {@code validate} method.
*
*
* @author <a href="mailto:Kohsuke.Kawaguchi@Sun.com">Kohsuke Kawaguchi</a>
* @since 1.5
*/
public abstract class Validator {
/**
* Constructor for derived classes.
*
* <p>The constructor does nothing.
*
* <p>Derived classes must create {@link Validator} objects that have
* {@code null} {@link ErrorHandler} and
* {@code null} {@link LSResourceResolver}.
*/
protected Validator() {
}
/**
* Reset this {@code Validator} to its original configuration.
*
* <p>{@code Validator} is reset to the same state as when it was created with
* {@link Schema#newValidator()}.
* {@code reset()} is designed to allow the reuse of existing {@code Validator}s
* thus saving resources associated with the creation of new {@code Validator}s.
*
* <p>The reset {@code Validator} is not guaranteed to have
* the same {@link LSResourceResolver} or {@link ErrorHandler}
* {@code Object}s, e.g. {@link Object#equals(Object obj)}.
* It is guaranteed to have a functionally equal
* {@code LSResourceResolver} and {@code ErrorHandler}.
*/
public abstract void reset();
/**
* Validates the specified input.
*
* <p>This is just a convenience method for
* {@link #validate(Source source, Result result)}
* with {@code result} of {@code null}.
*
* @param source
* XML to be validated. Must be an XML document or
* XML element and must not be null. For backwards compatibility,
* the results of attempting to validate anything other than
* a document or element are implementation-dependent.
* Implementations must either recognize and process the input
* or throw an IllegalArgumentException.
*
* @throws IllegalArgumentException
* If the {@code Source}
* is an XML artifact that the implementation cannot
* validate (for example, a processing instruction).
*
* @throws SAXException
* If the {@link ErrorHandler} throws a {@link SAXException} or
* if a fatal error is found and the {@link ErrorHandler} returns
* normally.
*
* @throws IOException
* If the validator is processing a
* {@link javax.xml.transform.sax.SAXSource} and the
* underlying {@link org.xml.sax.XMLReader} throws an
* {@link IOException}.
*
*
* @throws NullPointerException If {@code source} is
* {@code null}.
*
* @see #validate(Source source, Result result)
*/
public void validate(Source source)
throws SAXException, IOException {
validate(source, null);
}
/**
* Validates the specified input and send the augmented validation
* result to the specified output.
*
* <p>This method places the following restrictions on the types of
* the {@link Source}/{@link Result} accepted.
*
* <table border=1>
* <thead>
* <tr>
* <th colspan="5">{@code Source} / {@code Result} Accepted</th>
* </tr>
* <tr>
* <th></th>
* <th>{@link javax.xml.transform.stream.StreamSource}</th>
* <th>{@link javax.xml.transform.sax.SAXSource}</th>
* <th>{@link javax.xml.transform.dom.DOMSource}</th>
* <th>{@link javax.xml.transform.stax.StAXSource}</th>
* </tr>
* </thead>
* <tbody align="center">
* <tr>
* <td>{@code null}</td>
* <td>OK</td>
* <td>OK</td>
* <td>OK</td>
* <td>OK</td>
* </tr>
* <tr>
* <th>{@link javax.xml.transform.stream.StreamResult}</th>
* <td>OK</td>
* <td>{@code IllegalArgumentException}</td>
* <td>{@code IllegalArgumentException}</td>
* <td>{@code IllegalArgumentException}</td>
* </tr>
* <tr>
* <th>{@link javax.xml.transform.sax.SAXResult}</th>
* <td>{@code IllegalArgumentException}</td>
* <td>OK</td>
* <td>{@code IllegalArgumentException}</td>
* <td>{@code IllegalArgumentException}</td>
* </tr>
* <tr>
* <th>{@link javax.xml.transform.dom.DOMResult}</th>
* <td>{@code IllegalArgumentException}</td>
* <td>{@code IllegalArgumentException}</td>
* <td>OK</td>
* <td>{@code IllegalArgumentException}</td>
* </tr>
* <tr>
* <th>{@link javax.xml.transform.stax.StAXResult}</th>
* <td>{@code IllegalArgumentException}</td>
* <td>{@code IllegalArgumentException}</td>
* <td>{@code IllegalArgumentException}</td>
* <td>OK</td>
* </tr>
* </tbody>
* </table>
*
* <p>To validate one {@code Source} into another kind of
* {@code Result}, use the identity transformer (see
* {@link javax.xml.transform.TransformerFactory#newTransformer()}).
*
* <p>Errors found during the validation is sent to the specified
* {@link ErrorHandler}.
*
* <p>If a document is valid, or if a document contains some errors
* but none of them were fatal and the {@code ErrorHandler} didn't
* throw any exception, then the method returns normally.
*
* @param source
* XML to be validated. Must be an XML document or
* XML element and must not be null. For backwards compatibility,
* the results of attempting to validate anything other than
* a document or element are implementation-dependent.
* Implementations must either recognize and process the input
* or throw an IllegalArgumentException.
*
* @param result
* The {@code Result} object that receives (possibly augmented)
* XML. This parameter can be null if the caller is not interested
* in it.
*
* Note that when a {@code DOMResult} is used,
* a validator might just pass the same DOM node from
* {@code DOMSource} to {@code DOMResult}
* (in which case {@code source.getNode()==result.getNode()}),
* it might copy the entire DOM tree, or it might alter the
* node given by the source.
*
* @throws IllegalArgumentException
* If the {@code Result} type doesn't match the
* {@code Source} type of if the {@code Source}
* is an XML artifact that the implementation cannot
* validate (for example, a processing instruction).
* @throws SAXException
* If the {@code ErrorHandler} throws a
* {@code SAXException} or
* if a fatal error is found and the {@code ErrorHandler} returns
* normally.
* @throws IOException
* If the validator is processing a
* {@code SAXSource} and the
* underlying {@link org.xml.sax.XMLReader} throws an
* {@code IOException}.
* @throws NullPointerException
* If the {@code source} parameter is {@code null}.
*
* @see #validate(Source source)
*/
public abstract void validate(Source source, Result result)
throws SAXException, IOException;
/**
* Sets the {@link ErrorHandler} to receive errors encountered
* during the {@code validate} method invocation.
*
* <p>
* Error handler can be used to customize the error handling process
* during a validation. When an {@link ErrorHandler} is set,
* errors found during the validation will be first sent
* to the {@link ErrorHandler}.
*
* <p>
* The error handler can abort further validation immediately
* by throwing {@link SAXException} from the handler. Or for example
* it can print an error to the screen and try to continue the
* validation by returning normally from the {@link ErrorHandler}
*
* <p>
* If any {@link Throwable} is thrown from an {@link ErrorHandler},
* the caller of the {@code validate} method will be thrown
* the same {@link Throwable} object.
*
* <p>
* {@link Validator} is not allowed to
* throw {@link SAXException} without first reporting it to
* {@link ErrorHandler}.
*
* <p>
* When the {@link ErrorHandler} is null, the implementation will
* behave as if the following {@link ErrorHandler} is set:
* <pre>
* 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
* }
* }
* </pre>
*
* <p>
* When a new {@link Validator} object is created, initially
* this field is set to null.
*
* @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 Validator}.
*
* @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 Validator}
* has created.
*
* @see #setErrorHandler(ErrorHandler)
*/
public abstract ErrorHandler getErrorHandler();
/**
* Sets the {@link LSResourceResolver} to customize
* resource resolution while in a validation episode.
*
* <p>
* {@link Validator} uses a {@link LSResourceResolver}
* when it needs to locate external resources while a validation,
* although exactly what constitutes "locating external resources" is
* up to each schema language.
*
* <p>
* When the {@link LSResourceResolver} is null, the implementation will
* behave as if the following {@link LSResourceResolver} is set:
* <pre>
* class DumbLSResourceResolver implements {@link LSResourceResolver} {
* public {@link org.w3c.dom.ls.LSInput} resolveResource(
* String publicId, String systemId, String baseURI) {
*
* return null; // always return null
* }
* }
* </pre>
*
* <p>
* If a {@link LSResourceResolver} throws a {@link RuntimeException}
* (or instances of its derived classes),
* then the {@link Validator} will abort the parsing and
* the caller of the {@code validate} method will receive
* the same {@link RuntimeException}.
*
* <p>
* When a new {@link Validator} object is created, initially
* this field is set to null.
*
* @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 Validator}.
*
* @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 Validator}
* has created.
*
* @see #setErrorHandler(ErrorHandler)
*/
public abstract LSResourceResolver getResourceResolver();
/**
* Look up the value of a feature flag.
*
* <p>The feature name is any fully-qualified URI. It is
* possible for a {@link Validator} to recognize a feature name but
* temporarily be unable to return its value.
* Some feature values may be available only in specific
* contexts, such as before, during, or after a validation.
*
* <p>Implementors 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).
*
* @throws SAXNotRecognizedException If the feature
* value can't be assigned or retrieved.
* @throws SAXNotSupportedException When the
* {@link Validator} recognizes the feature name but
* cannot determine its value at this time.
* @throws NullPointerException
* When the name parameter is null.
*
* @see #setFeature(String, boolean)
*/
public boolean getFeature(String name)
throws SAXNotRecognizedException, SAXNotSupportedException {
if (name == null) {
throw new NullPointerException("the name parameter is null");
}
throw new SAXNotRecognizedException(name);
}
/**
* Set the value of a feature flag.
*
* <p>
* Feature can be used to control the way a {@link Validator}
* parses schemas, although {@link Validator}s are not required
* to recognize any specific feature names.
*
* <p>The feature name is any fully-qualified URI. It is
* possible for a {@link Validator} to expose a feature value but
* to be unable to change the current value.
* Some feature values may be immutable or mutable only
* in specific contexts, such as before, during, or after
* a validation.
*
* @param name The feature name, which is a non-null fully-qualified URI.
* @param value The requested value of the feature (true or false).
*
* @throws SAXNotRecognizedException If the feature
* value can't be assigned or retrieved.
* @throws SAXNotSupportedException When the
* {@link Validator} recognizes the feature name but
* cannot set the requested value.
* @throws NullPointerException
* When the name parameter is null.
*
* @see #getFeature(String)
*/
public void setFeature(String name, boolean value)
throws SAXNotRecognizedException, SAXNotSupportedException {
if (name == null) {
throw new NullPointerException("the name parameter is null");
}
throw new SAXNotRecognizedException(name);
}
/**
* Set the value of a property.
*
* <p>The property name is any fully-qualified URI. It is
* possible for a {@link Validator} to recognize a property name but
* to be unable to change the current value.
* Some property values may be immutable or mutable only
* in specific contexts, such as before, during, or after
* a validation.
*
* <p>
* All implementations that implement JAXP 1.5 or newer are required to
* support the {@link javax.xml.XMLConstants#ACCESS_EXTERNAL_DTD} and
* {@link javax.xml.XMLConstants#ACCESS_EXTERNAL_SCHEMA} properties.
*
* <ul>
* <li>
* <p>Access to external DTDs in source or Schema file is restricted to
* the protocols specified by the {@link javax.xml.XMLConstants#ACCESS_EXTERNAL_DTD}
* property. If access is denied during validation due to the restriction
* of this property, {@link org.xml.sax.SAXException} will be thrown by the
* {@link #validate(Source)} method.
*
* <p>Access to external reference set by the schemaLocation attribute is
* restricted to the protocols specified by the
* {@link javax.xml.XMLConstants#ACCESS_EXTERNAL_SCHEMA} property.
* If access is denied during validation due to the restriction of this property,
* {@link org.xml.sax.SAXException} will be thrown by the
* {@link #validate(Source)} method.
* </li>
* </ul>
*
* @param name The property name, which is a non-null fully-qualified URI.
* @param object The requested value for the property.
*
* @throws SAXNotRecognizedException If the property
* value can't be assigned or retrieved.
* @throws SAXNotSupportedException When the
* {@link Validator} recognizes the property name but
* cannot set the requested value.
* @throws NullPointerException
* When the name parameter is null.
*/
public void setProperty(String name, Object object)
throws SAXNotRecognizedException, SAXNotSupportedException {
if (name == null) {
throw new NullPointerException("the name parameter is null");
}
throw new SAXNotRecognizedException(name);
}
/**
* Look up the value of a property.
*
* <p>The property name is any fully-qualified URI. It is
* possible for a {@link Validator} to recognize a property name but
* temporarily be unable to return its value.
* Some property values may be available only in specific
* contexts, such as before, during, or after a validation.
*
* <p>{@link Validator}s are not required to recognize any specific
* property names.
*
* <p>Implementors 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.
*
* @throws SAXNotRecognizedException If the property
* value can't be assigned or retrieved.
* @throws SAXNotSupportedException When the
* XMLReader recognizes the property name but
* cannot determine its value at this time.
* @throws NullPointerException
* When the name parameter is null.
*
* @see #setProperty(String, Object)
*/
public Object getProperty(String name)
throws SAXNotRecognizedException, SAXNotSupportedException {
if (name == null) {
throw new NullPointerException("the name parameter is null");
}
throw new SAXNotRecognizedException(name);
}
}