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/*
* 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: TypeInfoProvider.java 884939 2009-11-27 18:20:46Z mrglavas $
package javax.xml.validation;
import org.w3c.dom.TypeInfo;
/**
* This class provides access to the type information determined
* by {@link ValidatorHandler}.
*
* <p>
* Some schema languages, such as W3C XML Schema, encourages a validator
* to report the "type" it assigns to each attribute/element.
* Those applications who wish to access this type information can invoke
* methods defined on this "interface" to access such type information.
*
* <p>
* Implementation of this "interface" can be obtained through the
* {@link ValidatorHandler#getTypeInfoProvider()} method.
*
* @author <a href="mailto:Kohsuke.Kawaguchi@Sun.com">Kohsuke Kawaguchi</a>
* @version $Revision: 884939 $, $Date: 2009-11-27 13:20:46 -0500 (Fri, 27 Nov 2009) $
* @see org.w3c.dom.TypeInfo
* @since 1.5
*/
public abstract class TypeInfoProvider {
/**
* Constructor for the derived class.
*
* <p>
* The constructor does nothing.
*/
protected TypeInfoProvider() {
}
/**
* <p>Returns the immutable {@link TypeInfo} object for the current element.</p>
*
* <p>
* The method may only be called by the startElement and endElement event of
* the {@link org.xml.sax.ContentHandler} that the application sets to the
* {@link ValidatorHandler}.</p>
*
* @throws IllegalStateException
* If this method is called from other {@link org.xml.sax.ContentHandler}
* methods.
* @return
* An immutable {@link TypeInfo} object that represents the
* type of the current element.
* Note that the caller can keep references to the obtained
* {@link TypeInfo} longer than the callback scope.
*
* Otherwise, this method returns
* null if the validator is unable to
* determine the type of the current element for some reason
* (for example, if the validator is recovering from
* an earlier error.)
*
*/
public abstract TypeInfo getElementTypeInfo();
/**
* Returns the immutable {@link TypeInfo} object for the specified
* attribute of the current element.
*
* <p>
* The method may only be called by the startElement event of
* the {@link org.xml.sax.ContentHandler} that the application sets to the
* {@link ValidatorHandler}.
*
* @param index
* The index of the attribute. The same index for
* the {@link org.xml.sax.Attributes} object passed to the
* <tt>startElement</tt> callback.
*
* @throws IndexOutOfBoundsException
* If the index is invalid.
* @throws IllegalStateException
* If this method is called from other {@link org.xml.sax.ContentHandler}
* methods.
*
* @return
* An immutable {@link TypeInfo} object that represents the
* type of the specified attribute.
* Note that the caller can keep references to the obtained
* {@link TypeInfo} longer than the callback scope.
*
* Otherwise, this method returns
* null if the validator is unable to
* determine the type.
*/
public abstract TypeInfo getAttributeTypeInfo(int index);
/**
* Returns <tt>true</tt> if the specified attribute is determined
* to be ID.
*
* <p>
* Exactly how an attribute is "determined to be ID" is up to the
* schema language. In case of W3C XML Schema, this means
* that the actual type of the attribute is the built-in ID type
* or its derived type.
*
* <p>
* A {@link javax.xml.parsers.DocumentBuilder} uses this information
* to properly implement {@link org.w3c.dom.Attr#isId()}.
*
* <p>
* The method may only be called by the startElement event of
* the {@link org.xml.sax.ContentHandler} that the application sets to the
* {@link ValidatorHandler}.
*
* @param index
* The index of the attribute. The same index for
* the {@link org.xml.sax.Attributes} object passed to the
* <tt>startElement</tt> callback.
*
* @throws IndexOutOfBoundsException
* If the index is invalid.
* @throws IllegalStateException
* If this method is called from other {@link org.xml.sax.ContentHandler}
* methods.
*
* @return true
* if the type of the specified attribute is ID.
*/
public abstract boolean isIdAttribute(int index);
/**
* Returns <tt>false</tt> if the attribute was added by the validator.
*
* <p>
* This method provides information necessary for
* a {@link javax.xml.parsers.DocumentBuilder} to determine what
* the DOM tree should return from the {@link org.w3c.dom.Attr#getSpecified()} method.
*
* <p>
* The method may only be called by the startElement event of
* the {@link org.xml.sax.ContentHandler} that the application sets to the
* {@link ValidatorHandler}.
*
* <p>
* A general guideline for validators is to return true if
* the attribute was originally present in the pipeline, and
* false if it was added by the validator.
*
* @param index
* The index of the attribute. The same index for
* the {@link org.xml.sax.Attributes} object passed to the
* <tt>startElement</tt> callback.
*
* @throws IndexOutOfBoundsException
* If the index is invalid.
* @throws IllegalStateException
* If this method is called from other {@link org.xml.sax.ContentHandler}
* methods.
*
* @return
* <tt>true</tt> if the attribute was present before the validator
* processes input. <tt>false</tt> if the attribute was added
* by the validator.
*/
public abstract boolean isSpecified(int index);
}
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