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: Class StringValue
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com.icl.saxon.expr
Class StringValue


java.lang.Object

  |

  +--com.icl.saxon.expr.Expression

        |

        +--com.icl.saxon.expr.Value

              |

              +--com.icl.saxon.expr.StringValue
public final class StringValue
extends Value

A string value

Fields inherited from class com.icl.saxon.expr.Value
ANY, BOOLEAN, NODESET, NUMBER, OBJECT, STRING
 
Fields inherited from class com.icl.saxon.expr.Expression
staticContext
 
Constructor Summary
StringValue(java.lang.String value)
          Constructor
 
Method Summary
 boolean asBoolean()
          Convert the string value to a boolean
 double asNumber()
          Convert the string value to a number
 java.lang.String asString()
          Get the string value as a String
 int conversionPreference(java.lang.Class required)
          Get conversion preference for this value to a Java class.
 java.lang.Object convertToJava(java.lang.Class target)
          Convert to Java object (for passing to external functions)
 void display(int level)
          Diagnostic print of expression structure
 boolean equals(StringValue other)
          Determine if two StringValues are equal
static int[] expand(java.lang.String s)
          Expand a string containing surrogate pairs into an array of 32-bit characters
 int getDataType()
          Return the type of the expression (if known)
 int getLength()
          Get the length of this string, as defined in XPath.
static int getLength(java.lang.String s)
          Get the length of a string, as defined in XPath.
 
Methods inherited from class com.icl.saxon.expr.Value
compare, equals, evaluate, getDependencies, inverse, notEquals, numericCompare, reduce, simplify, stringToNumber
 
Methods inherited from class com.icl.saxon.expr.Expression
containsReferences, enumerate, evaluateAsBoolean, evaluateAsNodeSet, evaluateAsNumber, evaluateAsString, getStaticContext, indent, isContextDocumentNodeSet, make, outputStringValue, setStaticContext, usesCurrent
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

StringValue


public StringValue(java.lang.String value)
Constructor
Parameters:
value - the String value. Null is taken as equivalent to "".
Method Detail

asString


public java.lang.String asString()
Get the string value as a String
Overrides:
asString in class Value
Following copied from class: com.icl.saxon.expr.Value
Returns:
the value converted to a String

asNumber


public double asNumber()
Convert the string value to a number
Overrides:
asNumber in class Value
Following copied from class: com.icl.saxon.expr.Value
Returns:
the value converted to a String

asBoolean


public boolean asBoolean()
Convert the string value to a boolean
Overrides:
asBoolean in class Value
Returns:
false if the string value is zero-length, true otherwise

getDataType


public int getDataType()
Return the type of the expression (if known)
Overrides:
getDataType in class Expression
Returns:
Value.STRING (always)

getLength


public int getLength()
Get the length of this string, as defined in XPath. This is not the same as the Java length, as a Unicode surrogate pair counts as a single character

getLength


public static int getLength(java.lang.String s)
Get the length of a string, as defined in XPath. This is not the same as the Java length, as a Unicode surrogate pair counts as a single character.
Parameters:
s - The string whose length is required

expand


public static int[] expand(java.lang.String s)
Expand a string containing surrogate pairs into an array of 32-bit characters

equals


public boolean equals(StringValue other)
Determine if two StringValues are equal

conversionPreference


public int conversionPreference(java.lang.Class required)
Get conversion preference for this value to a Java class. A low result indicates higher preference.
Overrides:
conversionPreference in class Value

convertToJava


public java.lang.Object convertToJava(java.lang.Class target)
                               throws XPathException
Convert to Java object (for passing to external functions)
Overrides:
convertToJava in class Value
Following copied from class: com.icl.saxon.expr.Value
Parameters:
target - The class required by the external function
Returns:
an object of the target class

display


public void display(int level)
Diagnostic print of expression structure
Overrides:
display in class Expression
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