com.caucho.xpath.expr
Class AbstractStringExpr

java.lang.Object
  com.caucho.xpath.Expr
      com.caucho.xpath.expr.AbstractStringExpr

Direct Known Subclasses:

BaseURI, Functions.BaseURI, ResolveURI, Trace

public abstract class AbstractStringExpr
extends Expr

Implements the builtin XPath string expressions.

Field Summary

Fields inherited from class com.caucho.xpath.Expr

ADD, AND, ATTRIBUTE, BASE_URI, BOOLEAN, BOOLEAN_EQ, BOOLEAN_NEQ, CEILING, CONCAT, CONST, CONTAINS, COUNT, DIV, ELEMENT, EQ, FALSE, FLOOR, FORMAT_NUMBER, FUNCTION_AVAILABLE, GE, GENERATE_ID, GT, ID, IF, LANG, LAST, LAST_FUN, LE, LOCAL_PART, LT, MOD, MUL, NAMESPACE, NEG, NEQ, NODE_SET, NORMALIZE, NOT, NUMBER, NUMBER_EQ, NUMBER_GE, NUMBER_GT, NUMBER_LE, NUMBER_LT, NUMBER_NEQ, OR, POSITION, QNAME, QUO, ROUND, SELF, SELF_NAME, STARTS_WITH, STRING, STRING_EQ, STRING_LENGTH, STRING_NEQ, SUB, SUBSTRING, SUBSTRING_AFTER, SUBSTRING_BEFORE, SUM, SYSTEM_PROPERTY, TRANSLATE, TRUE

Constructor Summary

AbstractStringExpr()

Method Summary

boolean	evalBoolean(org.w3c.dom.Node node, ExprEnvironment env) Evaluate the expression as a boolean, i.e.
double	evalNumber(org.w3c.dom.Node node, ExprEnvironment env) Evaluate the expression as a double, i.e.
java.lang.Object	evalObject(org.w3c.dom.Node node, ExprEnvironment env) Evaluate the expression as an object, i.e.
abstract java.lang.String	evalString(org.w3c.dom.Node node, ExprEnvironment env) Evaluates the expression as an string.
boolean	isString() The StringExpr returns a string value.
protected static java.lang.String	normalize(java.lang.String string) Normalize the string, converting all whitespace to a space and eliminating consecutive spaces.

Methods inherited from class com.caucho.xpath.Expr

addParam, addVar, evalBoolean, evalNodeSet, evalNodeSet, evalNumber, evalObject, evalString, evalString, evalString, evalVar, getListContext, isBoolean, isNodeSet, isNumber, setListContext, setVar, stringToNumber, toBoolean, toDouble, toNode, toNodeList, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

AbstractStringExpr

public AbstractStringExpr()

Method Detail

isString

public boolean isString()

The StringExpr returns a string value.

Overrides:

isString in class Expr

evalString

public abstract java.lang.String evalString(org.w3c.dom.Node node,
                                            ExprEnvironment env)
                                     throws XPathException

Evaluates the expression as an string.

Specified by:

evalString in class Expr

Parameters:

node - the current node

env - the variable environment.

Returns:

the string representation of the expression.

Throws:

XPathException

evalBoolean

public boolean evalBoolean(org.w3c.dom.Node node,
                           ExprEnvironment env)
                    throws XPathException

Evaluate the expression as a boolean, i.e. evaluate it as a string and then convert it to a boolean.

Specified by:

evalBoolean in class Expr

Parameters:

node - the current node

env - the variable environment.

Returns:

the boolean representation of the expression.

Throws:

XPathException

evalNumber

public double evalNumber(org.w3c.dom.Node node,
                         ExprEnvironment env)
                  throws XPathException

Evaluate the expression as a double, i.e. evaluate it as a string and then convert it to a double.

Specified by:

evalNumber in class Expr

Parameters:

node - the current node

env - the variable environment.

Returns:

the numeric representation of the expression.

Throws:

XPathException

evalObject

public java.lang.Object evalObject(org.w3c.dom.Node node,
                                   ExprEnvironment env)
                            throws XPathException

Evaluate the expression as an object, i.e. return the string value.

Specified by:

evalObject in class Expr

Parameters:

node - the current node

env - the variable environment.

Returns:

the boolean representation of the expression.

Throws:

XPathException

normalize

protected static java.lang.String normalize(java.lang.String string)

Normalize the string, converting all whitespace to a space and eliminating consecutive spaces.