net.sf.saxon.functions
Class UnparsedTextLines

java.lang.Object
  net.sf.saxon.expr.Expression
      net.sf.saxon.expr.FunctionCall
          net.sf.saxon.functions.SystemFunction
              net.sf.saxon.functions.UnparsedText
                  net.sf.saxon.functions.UnparsedTextLines

All Implemented Interfaces:

Serializable, SourceLocator, LocationProvider, SaxonLocator, CallableExpression, InstructionInfo, Locator

public class UnparsedTextLines
extends UnparsedText
implements CallableExpression

See Also:

Serialized Form

Field Summary

Fields inherited from class net.sf.saxon.functions.SystemFunction

operation

Fields inherited from class net.sf.saxon.expr.FunctionCall

argument

Fields inherited from class net.sf.saxon.expr.Expression

EFFECTIVE_BOOLEAN_VALUE, EVALUATE_METHOD, EVENT_FEED_METHOD, ITEM_FEED_METHOD, ITERATE_METHOD, locationId, MAX_SEQUENCE_LENGTH, MAX_STRING_LENGTH, PROCESS_METHOD, PUSH_SELECTION, staticProperties, UNBOUNDED_LOWER, UNBOUNDED_UPPER, WATCH_METHOD

Constructor Summary

UnparsedTextLines()

Method Summary

SequenceIterator	call(SequenceIterator[] arguments, XPathContext context) Evaluate the expression
Item	evaluateItem(XPathContext context) This method handles evaluation of the function: it returns a StringValue in the case of unparsed-text(), or a BooleanValue in the case of unparsed-text-available().
static URI	getAbsoluteURI(String href, String baseURI)
static XPathException	handleIOError(URI absoluteURI, IOException ioErr)
SequenceIterator	iterate(XPathContext context) Return an Iterator to iterate over the values of a sequence.
static void	main(String[] args)
static CharSequence	readFile(NameChecker checker, Reader reader) Read the contents of an unparsed text file
CharSequence	readFile(String href, String baseURI, String encoding, XPathContext context) Supporting routine to load one external file given a URI (href) and a baseURI

Methods inherited from class net.sf.saxon.functions.UnparsedText

checkArguments, computeSpecialProperties, evalUnparsedText, getExpressionBaseURI, preEvaluate

Methods inherited from class net.sf.saxon.functions.SystemFunction

addContextDocumentArgument, addDocToPathMap, computeCardinality, copy, equals, getDetails, getErrorCodeForTypeErrors, getImplementationMethod, getItemType, getOperation, getRequiredType, makeSystemFunction, optimize, setDetails, useContextItemAsDefault

Methods inherited from class net.sf.saxon.expr.FunctionCall

addExternalFunctionCallToPathMap, checkArgumentCount, explain, getArguments, getDisplayName, getExpressionName, getFunctionName, getNumberOfArguments, hashCode, iterateSubExpressions, promote, replaceSubExpression, setArguments, setFunctionName, simplify, simplifyArguments, toString, typeCheck

Methods inherited from class net.sf.saxon.expr.Expression

addToPathMap, adoptChildExpression, checkForUpdatingSubexpressions, checkPermittedContents, computeDependencies, computeStaticProperties, doPromotion, dynamicError, effectiveBooleanValue, evaluateAsString, evaluatePendingUpdates, explain, getCardinality, getColumnNumber, getColumnNumber, getConstructType, getContainer, getDependencies, getEvaluationMethod, getExecutable, getHostLanguage, getIntegerBounds, getIntrinsicDependencies, getLineNumber, getLineNumber, getLocationId, getLocationProvider, getObjectName, getProperties, getProperty, getPublicId, getSlotsUsed, getSpecialProperties, getSystemId, getSystemId, hasLoopingSubexpression, hasVariableBinding, implementsStaticTypeCheck, isSubtreeExpression, isUpdatingExpression, isVacuousExpression, iterateEvents, iterateSameFocusSubExpressions, markTailFunctionCalls, process, resetLocalStaticProperties, setContainer, setEvaluationMethod, setFiltered, setFlattened, setLocationId, staticTypeCheck, suppressValidation, typeError

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface net.sf.saxon.expr.CallableExpression

getArguments

Constructor Detail

UnparsedTextLines

public UnparsedTextLines()

Method Detail

evaluateItem

public Item evaluateItem(XPathContext context)
                  throws XPathException

This method handles evaluation of the function: it returns a StringValue in the case of unparsed-text(), or a BooleanValue in the case of unparsed-text-available(). In the case of unparsed-text-lines() this shouldn't be called, but we deal with it anyway.

Overrides:

evaluateItem in class UnparsedText

Parameters:

context - The context in which the expression is to be evaluated

Returns:

the node or atomic value that results from evaluating the expression; or null to indicate that the result is an empty sequence

Throws:

XPathException - if any dynamic error occurs evaluating the expression

call

public SequenceIterator call(SequenceIterator[] arguments,
                             XPathContext context)
                      throws XPathException

Evaluate the expression

Specified by:

call in interface CallableExpression

Overrides:

call in class UnparsedText

Parameters:

arguments - the values of the arguments, supplied as SequenceIterators

context - the dynamic evaluation context

Returns:

the result of the evaluation, in the form of a SequenceIterator

Throws:

XPathException - if a dynamic error occurs during the evaluation of the expression

iterate

public SequenceIterator iterate(XPathContext context)
                         throws XPathException

Return an Iterator to iterate over the values of a sequence. The value of every expression can be regarded as a sequence, so this method is supported for all expressions. This default implementation handles iteration for expressions that return singleton values: for non-singleton expressions, the subclass must provide its own implementation.

Overrides:

iterate in class Expression

Parameters:

context - supplies the context for evaluation

Returns:

a SequenceIterator that can be used to iterate over the result of the expression

Throws:

XPathException - if any dynamic error occurs evaluating the expression

readFile

public CharSequence readFile(String href,
                             String baseURI,
                             String encoding,
                             XPathContext context)
                      throws XPathException

Supporting routine to load one external file given a URI (href) and a baseURI

Overrides:

readFile in class UnparsedText

Throws:

XPathException

getAbsoluteURI

public static URI getAbsoluteURI(String href,
                                 String baseURI)
                          throws XPathException

Throws:

XPathException

handleIOError

public static XPathException handleIOError(URI absoluteURI,
                                           IOException ioErr)

readFile

public static CharSequence readFile(NameChecker checker,
                                    Reader reader)
                             throws IOException,
                                    XPathException

Read the contents of an unparsed text file

Parameters:

checker - NameChecker for checking whether characters are valid XML characters

reader - Reader to be used for reading the file

Returns:

a CharSequence representing the contents of the file

Throws:

IOException - if a failure occurs reading the file

XPathException - if the file contains illegal characters

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception