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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 Schema
. A validator object is not thread-safe and not reentrant. In other words, it is the application's responsibility to make sure that one Validator
object is not used from more than one thread at any given time, and while the validate
method is invoked, applications may not recursively call the validate
method.
Author: Kohsuke Kawaguchi Since: 1.5
/**
* 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 Kohsuke Kawaguchi
* @since 1.5
*/
public abstract class Validator {
Constructor for derived classes.
The constructor does nothing.
Derived classes must create Validator
objects that have null
ErrorHandler
and null
LSResourceResolver
.
/**
* 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 Validator
to its original configuration. Validator
is reset to the same state as when it was created with Schema.newValidator()
. reset()
is designed to allow the reuse of existing Validator
s thus saving resources associated with the creation of new Validator
s.
The reset Validator
is not guaranteed to have the same LSResourceResolver
or ErrorHandler
Object
s, e.g. Object.equals(Object obj)
. It is guaranteed to have a functionally equal LSResourceResolver
and ErrorHandler
.
/**
* 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.
This is just a convenience method for validate(Source source, Result result)
with result
of null
.
Params: - 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
Source
is an XML artifact that the implementation cannot validate (for example, a processing instruction). - SAXException – If the
ErrorHandler
throws a SAXException
or if a fatal error is found and the ErrorHandler
returns normally. - IOException – If the validator is processing a
SAXSource
and the underlying XMLReader
throws an IOException
. - NullPointerException – If
source
is null
.
See Also:
/**
* 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.
This method places the following restrictions on the types of the Source
/Result
accepted.
Source
/ Result
Accepted
StreamSource
SAXSource
DOMSource
StAXSource
null
OK
OK
OK
OK
StreamResult
OK
IllegalArgumentException
IllegalArgumentException
IllegalArgumentException
SAXResult
IllegalArgumentException
OK
IllegalArgumentException
IllegalArgumentException
DOMResult
IllegalArgumentException
IllegalArgumentException
OK
IllegalArgumentException
StAXResult
IllegalArgumentException
IllegalArgumentException
IllegalArgumentException
OK
To validate one Source
into another kind of Result
, use the identity transformer (see TransformerFactory.newTransformer()
).
Errors found during the validation is sent to the specified ErrorHandler
.
If a document is valid, or if a document contains some errors but none of them were fatal and the ErrorHandler
didn't throw any exception, then the method returns normally.
Params: - 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.
- result – The
Result
object that receives (possibly augmented) XML. This parameter can be null if the caller is not interested in it. Note that when a DOMResult
is used, a validator might just pass the same DOM node from DOMSource
to DOMResult
(in which case 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
Result
type doesn't match the Source
type of if the Source
is an XML artifact that the implementation cannot validate (for example, a processing instruction). - SAXException – If the
ErrorHandler
throws a SAXException
or if a fatal error is found and the ErrorHandler
returns normally. - IOException – If the validator is processing a
SAXSource
and the underlying XMLReader
throws an IOException
. - NullPointerException – If the
source
parameter is null
.
See Also:
/**
* 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 class="plain">
* <caption>{@code Source} / {@code Result} Accepted</caption>
* <thead>
* <tr>
* <td></td>
* <th scope="col">{@link javax.xml.transform.stream.StreamSource}</th>
* <th scope="col">{@link javax.xml.transform.sax.SAXSource}</th>
* <th scope="col">{@link javax.xml.transform.dom.DOMSource}</th>
* <th scope="col">{@link javax.xml.transform.stax.StAXSource}</th>
* </tr>
* </thead>
* <tbody style="text-align:center">
* <tr>
* <th scope="row">{@code null}</th>
* <td>OK</td>
* <td>OK</td>
* <td>OK</td>
* <td>OK</td>
* </tr>
* <tr>
* <th scope="row">{@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 scope="row">{@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 scope="row">{@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 scope="row">{@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 ErrorHandler
to receive errors encountered during the validate
method invocation. Error handler can be used to customize the error handling process during a validation. When an ErrorHandler
is set, errors found during the validation will be first sent to the ErrorHandler
.
The error handler can abort further validation immediately by throwing 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 ErrorHandler
If any Throwable
is thrown from an ErrorHandler
, the caller of the validate
method will be thrown the same Throwable
object.
Validator
is not allowed to throw SAXException
without first reporting it to ErrorHandler
.
When the ErrorHandler
is null, the implementation will behave as if the following ErrorHandler
is set:
class DraconianErrorHandler implements ErrorHandler
{ public void fatalError( SAXParseException
e ) throws SAXException
{ throw e; } public void error( SAXParseException
e ) throws SAXException
{ throw e; } public void warning( SAXParseException
e ) throws SAXException
{ // noop } }
When a new Validator
object is created, initially this field is set to null.
Params: - errorHandler –
A new error handler to be set. This parameter can be null.
/**
* 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 ErrorHandler
set to this Validator
. See Also: Returns: This method returns the object that was last set through the setErrorHandler(ErrorHandler)
method, or null if that method has never been called since this Validator
has created.
/**
* 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 LSResourceResolver
to customize resource resolution while in a validation episode. Validator
uses a LSResourceResolver
when it needs to locate external resources while a validation, although exactly what constitutes "locating external resources" is up to each schema language.
When the LSResourceResolver
is null, the implementation will behave as if the following LSResourceResolver
is set:
class DumbLSResourceResolver implements LSResourceResolver
{ public LSInput
resolveResource( String publicId, String systemId, String baseURI) { return null; // always return null } }
If a LSResourceResolver
throws a RuntimeException
(or instances of its derived classes), then the Validator
will abort the parsing and the caller of the validate
method will receive the same RuntimeException
.
When a new Validator
object is created, initially this field is set to null.
Params: - resourceResolver –
A new resource resolver to be set. This parameter can be null.
/**
* 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 LSResourceResolver
set to this Validator
. See Also: Returns: This method returns the object that was last set through the setResourceResolver(LSResourceResolver)
method, or null if that method has never been called since this Validator
has created.
/**
* 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.
The feature name is any fully-qualified URI. It is possible for a 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.
Implementors are free (and encouraged) to invent their own features,
using names built on their own URIs.
Params: - name – The feature name, which is a non-null fully-qualified URI.
Throws: - SAXNotRecognizedException – If the feature
value can't be assigned or retrieved.
- SAXNotSupportedException – When the
Validator
recognizes the feature name but cannot determine its value at this time. - NullPointerException –
When the name parameter is null.
See Also: Returns: The current value of the feature (true or false).
/**
* 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.
Feature can be used to control the way a Validator
parses schemas, although Validator
s are not required to recognize any specific feature names.
The feature name is any fully-qualified URI. It is possible for a 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.
Params: - name – The feature name, which is a non-null fully-qualified URI.
- value – The requested value of the feature (true or false).
Throws: - SAXNotRecognizedException – If the feature
value can't be assigned or retrieved.
- SAXNotSupportedException – When the
Validator
recognizes the feature name but cannot set the requested value. - NullPointerException –
When the name parameter is null.
See Also:
/**
* 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.
The property name is any fully-qualified URI. It is possible for a 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.
All implementations that implement JAXP 1.5 or newer are required to support the XMLConstants.ACCESS_EXTERNAL_DTD
and XMLConstants.ACCESS_EXTERNAL_SCHEMA
properties.
-
Access to external DTDs in source or Schema file is restricted to the protocols specified by the XMLConstants.ACCESS_EXTERNAL_DTD
property. If access is denied during validation due to the restriction of this property, SAXException
will be thrown by the validate(Source)
method.
Access to external reference set by the schemaLocation attribute is restricted to the protocols specified by the XMLConstants.ACCESS_EXTERNAL_SCHEMA
property. If access is denied during validation due to the restriction of this property, SAXException
will be thrown by the validate(Source)
method.
Params: - name – The property name, which is a non-null fully-qualified URI.
- object – The requested value for the property.
Throws: - SAXNotRecognizedException – If the property
value can't be assigned or retrieved.
- SAXNotSupportedException – When the
Validator
recognizes the property name but cannot set the requested value. - NullPointerException –
When the name parameter is null.
/**
* 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.
The property name is any fully-qualified URI. It is possible for a 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.
Validator
s are not required to recognize any specific property names.
Implementors are free (and encouraged) to invent their own properties,
using names built on their own URIs.
Params: - name – The property name, which is a non-null fully-qualified URI.
Throws: - SAXNotRecognizedException – If the property
value can't be assigned or retrieved.
- SAXNotSupportedException – When the
XMLReader recognizes the property name but
cannot determine its value at this time.
- NullPointerException –
When the name parameter is null.
See Also: Returns: The current value of the property.
/**
* 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);
}
}