/*
* 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.
*/
package org.apache.xerces.xni;
import org.apache.xerces.xni.parser.XMLDTDContentModelSource;
/**
* The DTD content model handler interface defines callback methods
* to report information items in DTD content models of an element
* declaration. Parser components interested in DTD content model
* information implement this interface and are registered as the DTD
* content model handler on the DTD content model source.
*
* @see XMLDTDHandler
*
* @author Andy Clark, IBM
*
* @version $Id: XMLDTDContentModelHandler.java 447247 2006-09-18 05:23:52Z mrglavas $
*/
public interface XMLDTDContentModelHandler {
//
// Constants
//
// separators
/**
* A choice separator for children and mixed content models. This
* separator is used to specify that the allowed child is one of a
* collection.
* <p>
* For example:
* <pre>
* <!ELEMENT elem (foo|bar)>
* <!ELEMENT elem (foo|bar+)>
* <!ELEMENT elem (foo|bar|baz)>
* <!ELEMENT elem (#PCDATA|foo|bar)*>
* </pre>
*
* @see #SEPARATOR_SEQUENCE
*/
public static final short SEPARATOR_CHOICE = 0;
/**
* A sequence separator for children content models. This separator
* is used to specify that the allowed children must follow in the
* specified sequence.
* <p>
* <pre>
* <!ELEMENT elem (foo,bar)>
* <!ELEMENT elem (foo,bar*)>
* <!ELEMENT elem (foo,bar,baz)>
* </pre>
*
* @see #SEPARATOR_CHOICE
*/
public static final short SEPARATOR_SEQUENCE = 1;
// occurrence counts
/**
* This occurrence count limits the element, choice, or sequence in a
* children content model to zero or one. In other words, the child
* is optional.
* <p>
* For example:
* <pre>
* <!ELEMENT elem (foo?)>
* </pre>
*
* @see #OCCURS_ZERO_OR_MORE
* @see #OCCURS_ONE_OR_MORE
*/
public static final short OCCURS_ZERO_OR_ONE = 2;
/**
* This occurrence count limits the element, choice, or sequence in a
* children content model to zero or more. In other words, the child
* may appear an arbitrary number of times, or not at all. This
* occurrence count is also used for mixed content models.
* <p>
* For example:
* <pre>
* <!ELEMENT elem (foo*)>
* <!ELEMENT elem (#PCDATA|foo|bar)*>
* </pre>
*
* @see #OCCURS_ZERO_OR_ONE
* @see #OCCURS_ONE_OR_MORE
*/
public static final short OCCURS_ZERO_OR_MORE = 3;
/**
* This occurrence count limits the element, choice, or sequence in a
* children content model to one or more. In other words, the child
* may appear an arbitrary number of times, but must appear at least
* once.
* <p>
* For example:
* <pre>
* <!ELEMENT elem (foo+)>
* </pre>
*
* @see #OCCURS_ZERO_OR_ONE
* @see #OCCURS_ZERO_OR_MORE
*/
public static final short OCCURS_ONE_OR_MORE = 4;
//
// XMLDTDContentModelHandler methods
//
/**
* The start of a content model. Depending on the type of the content
* model, specific methods may be called between the call to the
* startContentModel method and the call to the endContentModel method.
*
* @param elementName The name of the element.
* @param augmentations Additional information that may include infoset
* augmentations.
*
* @throws XNIException Thrown by handler to signal an error.
*/
public void startContentModel(String elementName, Augmentations augmentations)
throws XNIException;
/**
* A content model of ANY.
*
* @param augmentations Additional information that may include infoset
* augmentations.
*
* @throws XNIException Thrown by handler to signal an error.
*
* @see #empty
* @see #startGroup
*/
public void any(Augmentations augmentations) throws XNIException;
/**
* A content model of EMPTY.
*
* @throws XNIException Thrown by handler to signal an error.
*
* @param augmentations Additional information that may include infoset
* augmentations.
*
* @see #any
* @see #startGroup
*/
public void empty(Augmentations augmentations) throws XNIException;
/**
* A start of either a mixed or children content model. A mixed
* content model will immediately be followed by a call to the
* <code>pcdata()</code> method. A children content model will
* contain additional groups and/or elements.
*
* @param augmentations Additional information that may include infoset
* augmentations.
*
* @throws XNIException Thrown by handler to signal an error.
*
* @see #any
* @see #empty
*/
public void startGroup(Augmentations augmentations) throws XNIException;
/**
* The appearance of "#PCDATA" within a group signifying a
* mixed content model. This method will be the first called
* following the content model's <code>startGroup()</code>.
*
* @param augmentations Additional information that may include infoset
* augmentations.
*
* @throws XNIException Thrown by handler to signal an error.
*
* @see #startGroup
*/
public void pcdata(Augmentations augmentations) throws XNIException;
/**
* A referenced element in a mixed or children content model.
*
* @param elementName The name of the referenced element.
* @param augmentations Additional information that may include infoset
* augmentations.
*
* @throws XNIException Thrown by handler to signal an error.
*/
public void element(String elementName, Augmentations augmentations)
throws XNIException;
/**
* The separator between choices or sequences of a mixed or children
* content model.
*
* @param separator The type of children separator.
* @param augmentations Additional information that may include infoset
* augmentations.
*
* @throws XNIException Thrown by handler to signal an error.
*
* @see #SEPARATOR_CHOICE
* @see #SEPARATOR_SEQUENCE
*/
public void separator(short separator, Augmentations augmentations)
throws XNIException;
/**
* The occurrence count for a child in a children content model or
* for the mixed content model group.
*
* @param occurrence The occurrence count for the last element
* or group.
* @param augmentations Additional information that may include infoset
* augmentations.
*
* @throws XNIException Thrown by handler to signal an error.
*
* @see #OCCURS_ZERO_OR_ONE
* @see #OCCURS_ZERO_OR_MORE
* @see #OCCURS_ONE_OR_MORE
*/
public void occurrence(short occurrence, Augmentations augmentations)
throws XNIException;
/**
* The end of a group for mixed or children content models.
*
* @param augmentations Additional information that may include infoset
* augmentations.
*
* @throws XNIException Thrown by handler to signal an error.
*/
public void endGroup(Augmentations augmentations) throws XNIException;
/**
* The end of a content model.
*
* @param augmentations Additional information that may include infoset
* augmentations.
*
* @throws XNIException Thrown by handler to signal an error.
*/
public void endContentModel(Augmentations augmentations) throws XNIException;
// set content model source
public void setDTDContentModelSource(XMLDTDContentModelSource source);
// get content model source
public XMLDTDContentModelSource getDTDContentModelSource();
} // interface XMLDTDContentModelHandler
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