com.caucho.xpath.expr

Class StringExpr

java.lang.Object

com.caucho.xpath.Expr

com.caucho.xpath.expr.StringExpr

public class StringExpr
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

Constructors

Constructor and Description
StringExpr(int code, java.util.ArrayList args) Creates a string expression from a list of arguments.
StringExpr(int code, Expr expr)
StringExpr(int code, Expr left, Expr right)
StringExpr(int code, Expr left, Expr right, Expr third) Create a StringExpression with three arguments.
StringExpr(java.lang.String value)

Method Summary

Modifier and Type	Method and Description
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.
java.lang.String	evalString(org.w3c.dom.Node node, ExprEnvironment env) Evaluates the expression as an string.
java.lang.String	getValue()
boolean	isString() The StringExpr returns a string value.
java.lang.String	toString() Return the expression as a string.

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, wait, wait, wait

Constructor Detail

StringExpr

public StringExpr(int code,
                  Expr left,
                  Expr right,
                  Expr third)

Create a StringExpression with three arguments.

Parameters:

code - the Expr code of the expression.

left - the first argument.

right - the second argument.

third - the third argument.

StringExpr

public StringExpr(int code,
                  Expr left,
                  Expr right)

StringExpr

public StringExpr(int code,
                  Expr expr)

StringExpr

public StringExpr(java.lang.String value)

StringExpr

public StringExpr(int code,
                  java.util.ArrayList args)

Creates a string expression from a list of arguments.

Parameters:

code - Expr code for the function.

args - array list of the arguments.

Method Detail

isString

public boolean isString()

The StringExpr returns a string value.

Overrides:

isString in class Expr

getValue

public java.lang.String getValue()

evalString

public 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

toString

public java.lang.String toString()

Return the expression as a string. toString() returns a valid XPath expression. This lets applications like XSLT use toString() to print the string in the generated Java.

Overrides:

toString in class java.lang.Object