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java.lang.Object org.apache.xerces.impl.dtd.XMLContentSpec
public class XMLContentSpec
ContentSpec really exists to aid the parser classes in implementing access to the grammar.
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.
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.
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.
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.
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.
Nested Class Summary | |
---|---|
static interface |
XMLContentSpec.Provider
Provides a means for walking the structure built out of content spec "nodes". |
Field Summary | |
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static short |
CONTENTSPECNODE_ANY
Represents any namespace specified namespace. |
static short |
CONTENTSPECNODE_ANY_LAX
prcessContent is 'lax' |
static short |
CONTENTSPECNODE_ANY_LOCAL
Represents any local element (XML Schema: ##local). |
static short |
CONTENTSPECNODE_ANY_LOCAL_LAX
|
static short |
CONTENTSPECNODE_ANY_LOCAL_SKIP
|
static short |
CONTENTSPECNODE_ANY_OTHER
Represents any other namespace (XML Schema: ##other). |
static short |
CONTENTSPECNODE_ANY_OTHER_LAX
|
static short |
CONTENTSPECNODE_ANY_OTHER_SKIP
|
static short |
CONTENTSPECNODE_ANY_SKIP
processContent is 'skip' |
static short |
CONTENTSPECNODE_CHOICE
Represents choice, '|'. |
static short |
CONTENTSPECNODE_LEAF
Name or #PCDATA. |
static short |
CONTENTSPECNODE_ONE_OR_MORE
Represents a one or more occurence count, '+'. |
static short |
CONTENTSPECNODE_SEQ
Represents sequence, ','. |
static short |
CONTENTSPECNODE_ZERO_OR_MORE
Represents a zero or more occurence count, '*'. |
static short |
CONTENTSPECNODE_ZERO_OR_ONE
Represents a zero or one occurence count, '?'. |
java.lang.Object |
otherValue
The "right hand" value of the content spec node. |
short |
type
The content spec node type. |
java.lang.Object |
value
The "left hand" value object of the content spec node. |
Constructor Summary | |
---|---|
XMLContentSpec()
Default constructor. |
|
XMLContentSpec(short type,
java.lang.Object value,
java.lang.Object otherValue)
Constructs a content spec with the specified values. |
|
XMLContentSpec(XMLContentSpec.Provider provider,
int contentSpecIndex)
Constructs a content spec from the values specified by the given content spec provider and identifier. |
|
XMLContentSpec(XMLContentSpec contentSpec)
Constructs a content spec from the values in the specified content spec. |
Method Summary | |
---|---|
void |
clear()
Clears the values. |
boolean |
equals(java.lang.Object object)
Returns true if the two objects are equal. |
int |
hashCode()
Returns a hash code for this node. |
void |
setValues(short type,
java.lang.Object value,
java.lang.Object otherValue)
Sets the values. |
void |
setValues(XMLContentSpec.Provider provider,
int contentSpecIndex)
Sets the values from the values specified by the given content spec provider and identifier. |
void |
setValues(XMLContentSpec contentSpec)
Sets the values of the specified content spec. |
Methods inherited from class java.lang.Object |
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getClass, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
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public static final short CONTENTSPECNODE_LEAF
public static final short CONTENTSPECNODE_ZERO_OR_ONE
public static final short CONTENTSPECNODE_ZERO_OR_MORE
public static final short CONTENTSPECNODE_ONE_OR_MORE
public static final short CONTENTSPECNODE_CHOICE
public static final short CONTENTSPECNODE_SEQ
public static final short CONTENTSPECNODE_ANY
otherValue
will contain the name of the namespace.
If otherValue
is -1
then the element
can be from any namespace.
Lists of valid namespaces are created from choice content spec nodes that have any content spec nodes as children.
public static final short CONTENTSPECNODE_ANY_OTHER
When the content spec node type is set to CONTENTSPECNODE_ANY_OTHER,
value
will contain the namespace that cannot
occur.
public static final short CONTENTSPECNODE_ANY_LOCAL
public static final short CONTENTSPECNODE_ANY_LAX
public static final short CONTENTSPECNODE_ANY_OTHER_LAX
public static final short CONTENTSPECNODE_ANY_LOCAL_LAX
public static final short CONTENTSPECNODE_ANY_SKIP
public static final short CONTENTSPECNODE_ANY_OTHER_SKIP
public static final short CONTENTSPECNODE_ANY_LOCAL_SKIP
public short type
CONTENTSPECNODE_LEAF
,
CONTENTSPECNODE_ZERO_OR_ONE
,
CONTENTSPECNODE_ZERO_OR_MORE
,
CONTENTSPECNODE_ONE_OR_MORE
,
CONTENTSPECNODE_CHOICE
,
CONTENTSPECNODE_SEQ
public java.lang.Object value
public java.lang.Object otherValue
Constructor Detail |
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public XMLContentSpec()
public XMLContentSpec(short type, java.lang.Object value, java.lang.Object otherValue)
public XMLContentSpec(XMLContentSpec contentSpec)
public XMLContentSpec(XMLContentSpec.Provider provider, int contentSpecIndex)
Method Detail |
---|
public void clear()
public void setValues(short type, java.lang.Object value, java.lang.Object otherValue)
public void setValues(XMLContentSpec contentSpec)
public void setValues(XMLContentSpec.Provider provider, int contentSpecIndex)
public int hashCode()
hashCode
in class java.lang.Object
public boolean equals(java.lang.Object object)
equals
in class java.lang.Object
|
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