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Java example source code file (Validator.java)
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The Validator.java Java example source code
/*
* Copyright (c) 2003, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* 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).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
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;
/**
* <p>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.
* <p>
*
*
* @author <a href="mailto:Kohsuke.Kawaguchi@Sun.com">Kohsuke Kawaguchi
* @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}.
* </p>
*/
protected Validator() {
}
/**
* <p>Reset this Validator to its original configuration.
*
* <p>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 Validators
* thus saving resources associated with the creation of new <code>Validators.
*
* <p>The reset Validator is not guaranteed to have the same {@link LSResourceResolver} or {@link ErrorHandler}
* <code>Objects, e.g. {@link Object#equals(Object obj)}. It is guaranteed to have a functionally equal
* <code>LSResourceResolver and 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 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);
}
/**
* <p>Validates the specified input and send the augmented validation
* result to the specified output.</p>
*
* <p>This method places the following restrictions on the types of
* the {@link Source}/{@link Result} accepted.</p>
*
* <table border=1>
* <thead>
* <tr>
* <th colspan="5">Source / Result Accepted
* </tr>
* <tr>
* <th>
* <th>{@link javax.xml.transform.stream.StreamSource}
* <th>{@link javax.xml.transform.sax.SAXSource}
* <th>{@link javax.xml.transform.dom.DOMSource}
* <th>{@link javax.xml.transform.stax.StAXSource}
* </tr>
* </thead>
* <tbody align="center">
* <tr>
* <td>null |
* <td>OK
* <td>OK
* <td>OK
* <td>OK
* </tr>
* <tr>
* <th>{@link javax.xml.transform.stream.StreamResult}
* <td>OK
* <td>IllegalArgumentException
* <td>IllegalArgumentException
* <td>IllegalArgumentException
* </tr>
* <tr>
* <th>{@link javax.xml.transform.sax.SAXResult}
* <td>IllegalArgumentException
* <td>OK
* <td>IllegalArgumentException
* <td>IllegalArgumentException
* </tr>
* <tr>
* <th>{@link javax.xml.transform.dom.DOMResult}
* <td>IllegalArgumentException
* <td>IllegalArgumentException
* <td>OK
* <td>IllegalArgumentException
* </tr>
* <tr>
* <th>{@link javax.xml.transform.stax.StAXResult}
* <td>IllegalArgumentException
* <td>IllegalArgumentException
* <td>IllegalArgumentException
* <td>OK
* </tr>
* </tbody>
* </table>
*
* <p>To validate one Source into another kind of
* <code>Result, use the identity transformer (see
* {@link javax.xml.transform.TransformerFactory#newTransformer()}).</p>
*
* <p>Errors found during the validation is sent to the specified
* {@link ErrorHandler}.</p>
*
* <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.</p>
*
* @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 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 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 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.</p>
*
* @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>
*
* <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.</p>
*
* @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>
*
* <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.
* </p>
* <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>
*
* <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.</p>
* </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>
*
* <p>{@link Validator}s are not required to recognize any specific
* property names.</p>
*
* <p>Implementors are free (and encouraged) to invent their own properties,
* using names built on their own URIs.</p>
*
* @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);
}
}
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