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org.apache.taglibs.standard.tag.common.xml
Class XPathUtil
java.lang.Objectorg.apache.taglibs.standard.tag.common.xml.XPathUtil
- public class XPathUtil
- extends java.lang.Object
Support for tag handlers that evaluate XPath expressions.
| Nested Class Summary | |
protected class |
XPathUtil.JstlVariableContext
org.apache.xpath.VariableStack defines a class to keep track of a stack for template arguments and variables. |
| Constructor Summary | |
XPathUtil(javax.servlet.jsp.PageContext pc)
Constructs a new XPathUtil object associated with the given PageContext. |
|
| Method Summary | |
protected org.w3c.dom.Node |
adaptParamsForXalan(XPathUtil.JstlVariableContext jvc,
org.w3c.dom.Node n,
java.lang.String xpath)
To evaluate an XPath expression using Xalan, we need to create an XPath object, which wraps an expression object and provides general services for execution of that expression. |
boolean |
booleanValueOf(org.w3c.dom.Node n,
java.lang.String xpath)
Evaluate an XPath expression to a boolean value. |
private java.util.Vector |
fillVarStack(XPathUtil.JstlVariableContext vs,
org.apache.xpath.XPathContext xpathSupport)
|
static org.w3c.dom.Node |
getContext(javax.servlet.jsp.tagext.Tag t)
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private static org.w3c.dom.Document |
getDocumentForNode(org.w3c.dom.Node node)
|
(package private) static org.w3c.dom.Document |
getDummyDocument()
|
(package private) static org.w3c.dom.Document |
getDummyDocumentWithoutRoot()
|
private org.apache.xpath.VariableStack |
getLocalContext()
Returns a locally appropriate context given a node. |
java.util.Vector |
getVariableQNames()
|
private static void |
p(java.lang.String s)
|
static void |
printDetails(org.w3c.dom.Node n)
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java.util.List |
selectNodes(org.w3c.dom.Node n,
java.lang.String xpath)
Evaluate an XPath expression to a List of nodes. |
org.w3c.dom.Node |
selectSingleNode(org.w3c.dom.Node n,
java.lang.String xpath)
Evaluate an XPath expression to a single node. |
private static void |
staticInit()
Initialize globally useful data. |
java.lang.String |
valueOf(org.w3c.dom.Node n,
java.lang.String xpath)
Evaluate an XPath expression to a String value. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
| Field Detail |
globalVarSize
int globalVarSize
PAGE_NS_URL
private static final java.lang.String PAGE_NS_URL
- See Also:
- Constant Field Values
REQUEST_NS_URL
private static final java.lang.String REQUEST_NS_URL
- See Also:
- Constant Field Values
SESSION_NS_URL
private static final java.lang.String SESSION_NS_URL
- See Also:
- Constant Field Values
APP_NS_URL
private static final java.lang.String APP_NS_URL
- See Also:
- Constant Field Values
PARAM_NS_URL
private static final java.lang.String PARAM_NS_URL
- See Also:
- Constant Field Values
INITPARAM_NS_URL
private static final java.lang.String INITPARAM_NS_URL
- See Also:
- Constant Field Values
COOKIE_NS_URL
private static final java.lang.String COOKIE_NS_URL
- See Also:
- Constant Field Values
HEADER_NS_URL
private static final java.lang.String HEADER_NS_URL
- See Also:
- Constant Field Values
PAGE_P
private static final java.lang.String PAGE_P
- See Also:
- Constant Field Values
REQUEST_P
private static final java.lang.String REQUEST_P
- See Also:
- Constant Field Values
SESSION_P
private static final java.lang.String SESSION_P
- See Also:
- Constant Field Values
APP_P
private static final java.lang.String APP_P
- See Also:
- Constant Field Values
PARAM_P
private static final java.lang.String PARAM_P
- See Also:
- Constant Field Values
INITPARAM_P
private static final java.lang.String INITPARAM_P
- See Also:
- Constant Field Values
COOKIE_P
private static final java.lang.String COOKIE_P
- See Also:
- Constant Field Values
HEADER_P
private static final java.lang.String HEADER_P
- See Also:
- Constant Field Values
pageContext
private javax.servlet.jsp.PageContext pageContext
exprCache
private static java.util.HashMap exprCache
jstlPrefixResolver
private static JSTLPrefixResolver jstlPrefixResolver
dbf
static javax.xml.parsers.DocumentBuilderFactory dbf
db
static javax.xml.parsers.DocumentBuilder db
d
static org.w3c.dom.Document d
modifiedXPath
java.lang.String modifiedXPath
| Constructor Detail |
XPathUtil
public XPathUtil(javax.servlet.jsp.PageContext pc)
- Constructs a new XPathUtil object associated with the given
PageContext.
| Method Detail |
getVariableQNames
public java.util.Vector getVariableQNames()
staticInit
private static void staticInit()
- Initialize globally useful data.
getDummyDocument
static org.w3c.dom.Document getDummyDocument()
getDummyDocumentWithoutRoot
static org.w3c.dom.Document getDummyDocumentWithoutRoot()
getDocumentForNode
private static org.w3c.dom.Document getDocumentForNode(org.w3c.dom.Node node)
valueOf
public java.lang.String valueOf(org.w3c.dom.Node n, java.lang.String xpath) throws javax.servlet.jsp.JspTagException
- Evaluate an XPath expression to a String value.
booleanValueOf
public boolean booleanValueOf(org.w3c.dom.Node n, java.lang.String xpath) throws javax.servlet.jsp.JspTagException
- Evaluate an XPath expression to a boolean value.
selectNodes
public java.util.List selectNodes(org.w3c.dom.Node n, java.lang.String xpath) throws javax.servlet.jsp.JspTagException
- Evaluate an XPath expression to a List of nodes.
selectSingleNode
public org.w3c.dom.Node selectSingleNode(org.w3c.dom.Node n, java.lang.String xpath) throws javax.servlet.jsp.JspTagException
- Evaluate an XPath expression to a single node.
getLocalContext
private org.apache.xpath.VariableStack getLocalContext()
- Returns a locally appropriate context given a node.
adaptParamsForXalan
protected org.w3c.dom.Node adaptParamsForXalan(XPathUtil.JstlVariableContext jvc, org.w3c.dom.Node n, java.lang.String xpath)
- To evaluate an XPath expression using Xalan, we need
to create an XPath object, which wraps an expression object and provides
general services for execution of that expression.
An XPath object can be instantiated with the following information:
- XPath expression to evaluate
- SourceLocator
(reports where an error occurred in the XML source or
transformation instructions)
- PrefixResolver
(resolve prefixes to namespace URIs)
- type
(one of SELECT or MATCH)
- ErrorListener
(customized error handling)
Execution of the XPath expression represented by an XPath object
is done via method execute which takes the following parameters:
- XPathContext
The execution context
- Node contextNode
The node that "." expresses
- PrefixResolver namespaceContext
The context in which namespaces in the XPath are supposed to be
expanded.
Given all of this, if no context node is set for the evaluation
of the XPath expression, one must be set so Xalan
can successfully evaluate a JSTL XPath expression.
(it will not work if the context node is given as a varialbe
at the beginning of the expression)
fillVarStack
private java.util.Vector fillVarStack(XPathUtil.JstlVariableContext vs, org.apache.xpath.XPathContext xpathSupport) throws javax.servlet.jsp.JspTagException
getContext
public static org.w3c.dom.Node getContext(javax.servlet.jsp.tagext.Tag t) throws javax.servlet.jsp.JspTagException
p
private static void p(java.lang.String s)
printDetails
public static void printDetails(org.w3c.dom.Node n)
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DETAIL: FIELD | CONSTR | METHOD | ||||||||