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Java example source code file (XMLContentSpec.java)
The XMLContentSpec.java Java example source code/*
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* The Apache Software License, Version 1.1
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* Copyright (c) 1999-2002 The Apache Software Foundation. All rights
* reserved.
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* Redistribution and use in source and binary forms, with or without
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* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowledgment may appear in the software itself,
* if and wherever such third-party acknowledgments normally appear.
*
* 4. The names "Xerces" and "Apache Software Foundation" must
* not be used to endorse or promote products derived from this
* software without prior written permission. For written
* permission, please contact apache@apache.org.
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* 5. Products derived from this software may not be called "Apache",
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation and was
* originally based on software copyright (c) 1999, International
* Business Machines, Inc., http://www.apache.org. For more
* information on the Apache Software Foundation, please see
* <http://www.apache.org/>.
*/
package com.sun.org.apache.xerces.internal.impl.dtd;
/**
* ContentSpec really exists to aid the parser classes in implementing
* access to the grammar.
* <p>
* This class is used by the DTD scanner and the validator classes,
* allowing them to be used separately or together. This "struct"
* class is used to build content models for validation, where it
* is more efficient to fetch all of the information for each of
* these content model "fragments" than to fetch each field one at
* a time. Since configurations are allowed to have validators
* without a DTD scanner (i.e. a schema validator) and a DTD scanner
* without a validator (non-validating processor), this class can be
* used by each without requiring the presence of the other.
* <p>
* When processing element declarations, the DTD scanner will build
* up a representation of the content model using the node types that
* are defined here. Since a non-validating processor only needs to
* remember the type of content model declared (i.e. ANY, EMPTY, MIXED,
* or CHILDREN), it is free to discard the specific details of the
* MIXED and CHILDREN content models described using this class.
* <p>
* In the typical case of a validating processor reading the grammar
* of the document from a DTD, the information about the content model
* declared will be preserved and later "compiled" into an efficient
* form for use during element validation. Each content spec node
* that is saved is assigned a unique index that is used as a handle
* for the "value" or "otherValue" fields of other content spec nodes.
* A leaf node has a "value" that is either an index in the string
* pool of the element type of that leaf, or a value of -1 to indicate
* the special "#PCDATA" leaf type used in a mixed content model.
* <p>
* For a mixed content model, the content spec will be made up of
* leaf and choice content spec nodes, with an optional "zero or more"
* node. For example, the mixed content declaration "(#PCDATA)" would
* contain a single leaf node with a node value of -1. A mixed content
* declaration of "(#PCDATA|foo)*" would have a content spec consisting
* of two leaf nodes, for the "#PCDATA" and "foo" choices, a choice node
* with the "value" set to the index of the "#PCDATA" leaf node and the
* "otherValue" set to the index of the "foo" leaf node, and a "zero or
* more" node with the "value" set to the index of the choice node. If
* the content model has more choices, for example "(#PCDATA|a|b)*", then
* there will be more corresponding choice and leaf nodes, the choice
* nodes will be chained together through the "value" field with each
* leaf node referenced by the "otherValue" field.
* <p>
* For element content models, there are sequence nodes and also "zero or
* one" and "one or more" nodes. The leaf nodes would always have a valid
* string pool index, as the "#PCDATA" leaf is not used in the declarations
* for element content models.
*
* @xerces.internal
*
*/
public class XMLContentSpec {
//
// Constants
//
/**
* Name or #PCDATA. Leaf nodes that represent parsed character
* data (#PCDATA) have values of -1.
*/
public static final short CONTENTSPECNODE_LEAF = 0;
/** Represents a zero or one occurence count, '?'. */
public static final short CONTENTSPECNODE_ZERO_OR_ONE = 1;
/** Represents a zero or more occurence count, '*'. */
public static final short CONTENTSPECNODE_ZERO_OR_MORE = 2;
/** Represents a one or more occurence count, '+'. */
public static final short CONTENTSPECNODE_ONE_OR_MORE = 3;
/** Represents choice, '|'. */
public static final short CONTENTSPECNODE_CHOICE = 4;
/** Represents sequence, ','. */
public static final short CONTENTSPECNODE_SEQ = 5;
/**
* Represents any namespace specified namespace. When the element
* found in the document must belong to a specific namespace,
* <code>otherValue will contain the name of the namespace.
* If <code>otherValue is
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