## net.sf.saxon.expr
Class XPathContextMinor

    java.lang.Object
      net.sf.saxon.expr.XPathContextMinor

All Implemented Interfaces:
  XPathContext

Direct Known Subclasses:
  XPathContextMajor

    public class XPathContextMinor

extends Object
implements XPathContext

This class represents a minor change in the dynamic context in which an XPath expression is evaluated: a "major context" object allows all aspects of the dynamic context to change, whereas a "minor context" only allows changes to the focus and the destination for push output.

Nested Class Summary
`protected static class` `XPathContextMinor.LastValue` Container for cached value of the last() function.

Field Summary
`protected StackFrame` `stackFrame`

Constructor Summary
`protected` `XPathContextMinor()` Private Constructor

Method Summary
`void` `changeOutputDestination(Receiver receiver, boolean isFinal, int validation, SchemaType schemaType)` Set a new output destination, supplying the output format details.
`ValueRepresentation` `evaluateLocalVariable(int slotnumber)` Get the value of a local variable, identified by its slot number
`XPathContext` `getCaller()` Get the calling XPathContext (the next one down the stack).
`StringCollator` `getCollation(String name)` Get a named collation
`Configuration` `getConfiguration()` Get the Configuration
`Item` `getContextItem()` Get the context item
`int` `getContextPosition()` Get the context position (the position of the context item)
`Controller` `getController()` Get the Controller.
`DateTimeValue` `getCurrentDateTime()` Get the current date and time for this query or transformation.
`XPathException` `getCurrentException()` Get the current exception (in saxon:catch)
`GroupIterator` `getCurrentGroupIterator()` Get the current group iterator.
`SequenceIterator` `getCurrentIterator()` Get the current iterator.
`Mode` `getCurrentMode()` Get the current mode.
`RegexIterator` `getCurrentRegexIterator()` Get the current regex iterator.
`Rule` `getCurrentTemplateRule()` Get the current template.
`int` `getImplicitTimezone()` Get the implicit timezone, as a positive or negative offset from UTC in minutes.
`int` `getLast()` Get the context size (the position of the last item in the current node list)
`ParameterSet` `getLocalParameters()` Get the local parameters for the current template call.
`NameChecker` `getNameChecker()` Get a NameChecker for checking names against the XML 1.0 or XML 1.1 specification as appropriate
`NamePool` `getNamePool()` Get the Name Pool
`InstructionInfo` `getOrigin()` Get information about the creating expression or other construct.
`int` `getOriginatingConstructType()` Get the type of location from which this context was created.
`SequenceReceiver` `getReceiver()` Get the Receiver to which output is currently being written.
`StackFrame` `getStackFrame()` Get a reference to the local stack frame for variables.
`ParameterSet` `getTunnelParameters()` Get the tunnel parameters for the current template call.
`boolean` `isAtLast()` Determine whether the context position is the same as the context size that is, whether position()=last()
`Iterator` `iterateStackFrames()` Get the context stack.
`XPathContextMajor` `newCleanContext()` Construct a new context without copying (used for the context in a function call)
`XPathContextMajor` `newContext()` Construct a new context as a copy of another.
`XPathContextMinor` `newMinorContext()` Construct a new context as a copy of another.
`void` `setCaller(XPathContext caller)` Set the calling XPathContext
`void` `setCurrentException(XPathException exception)` Set the current exception (in saxon:catch)
`void` `setCurrentIterator(SequenceIterator iter)` Set a new sequence iterator.
`void` `setLocalVariable(int slotnumber, ValueRepresentation value)` Set the value of a local variable, identified by its slot number
`void` `setOrigin(InstructionInfo expr)` Set the creating expression (for use in diagnostics).
`void` `setOriginatingConstructType(int loc)` Set the type of creating expression (for use in diagnostics).
`void` `setReceiver(SequenceReceiver receiver)` Change the Receiver to which output is written
`void` `setTemporaryOutputState(boolean temp)` Mark the context as being in (or not in) temporary output state
`void` `setTemporaryReceiver(SequenceReceiver out)` Set the output destination to write to a sequence.
`int` `useLocalParameter(StructuredQName qName, LocalParam binding, boolean isTunnel)` Use local parameter.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### stackFrame

    protected StackFrame stackFrame

Constructor Detail

### XPathContextMinor

    protected XPathContextMinor()

  Private Constructor

Method Detail

### newContext

    public XPathContextMajor newContext()

  Construct a new context as a copy of another. The new context is effectively added to the top of a stack, and contains a pointer to the previous context

  Specified by:
    `newContext` in interface `XPathContext`
  Returns:
    a new context, created as a copy of this context

### newMinorContext

    public XPathContextMinor newMinorContext()

  Construct a new context as a copy of another. The new context is effectively added to the top of a stack, and contains a pointer to the previous context

  Specified by:
    `newMinorContext` in interface `XPathContext`
  Returns:
    a new minor context

### setCaller

    public void setCaller(XPathContext caller)

  Set the calling XPathContext

  Specified by:
    `setCaller` in interface `XPathContext`
  Parameters:
    `caller` - the XPathContext of the calling expression

### newCleanContext

    public XPathContextMajor newCleanContext()

  Construct a new context without copying (used for the context in a function call)

  Specified by:
    `newCleanContext` in interface `XPathContext`
  Returns:
    a new clean context

### getLocalParameters

    public ParameterSet getLocalParameters()

  Get the local parameters for the current template call.

  Specified by:
    `getLocalParameters` in interface `XPathContext`
  Returns:
    the supplied parameters

### getTunnelParameters

    public ParameterSet getTunnelParameters()

  Get the tunnel parameters for the current template call.

  Specified by:
    `getTunnelParameters` in interface `XPathContext`
  Returns:
    the supplied tunnel parameters

### setOrigin

    public void setOrigin(InstructionInfo expr)

  Set the creating expression (for use in diagnostics). The origin is generally set to "this" by the object that creates the new context. It's up to the debugger to determine whether this information is useful. Where possible, the object will be an `Expression`, allowing information about the calling instruction to be obtained.

  Specified by:
    `setOrigin` in interface `XPathContext`
  Parameters:
    `expr` - the expression that created this context object

### setOriginatingConstructType

    public void setOriginatingConstructType(int loc)

  Set the type of creating expression (for use in diagnostics). When a new context is created, either this method or `XPathContext.setOrigin(net.sf.saxon.trace.InstructionInfo)` should be called.

  Specified by:
    `setOriginatingConstructType` in interface `XPathContext`
  Parameters:
    `loc` - The originating location: the argument must be one of the integer constants in class `Location`

### getOriginatingConstructType

    public int getOriginatingConstructType()

  Get the type of location from which this context was created.

  Specified by:
    `getOriginatingConstructType` in interface `XPathContext`
  Returns:
    the type of location. (The integer codes that are used are often fingerprints of instruction names, but not always. For details of the codes, see the standard trace listener which interprets them)

### getOrigin

    public InstructionInfo getOrigin()

  Get information about the creating expression or other construct.

  Specified by:
    `getOrigin` in interface `XPathContext`
  Returns:
    information about the creating expression

### getController

    public final Controller getController()

  Get the Controller. May return null when running outside XSLT or XQuery

  Specified by:
    `getController` in interface `XPathContext`
  Returns:
    the controller for this query or transformation

### getConfiguration

    public final Configuration getConfiguration()

  Get the Configuration

  Specified by:
    `getConfiguration` in interface `XPathContext`
  Returns:
    the Saxon configuration object

### getNamePool

    public final NamePool getNamePool()

  Get the Name Pool

  Specified by:
    `getNamePool` in interface `XPathContext`
  Returns:
    the name pool

### getNameChecker

    public final NameChecker getNameChecker()

  Get a NameChecker for checking names against the XML 1.0 or XML 1.1 specification as appropriate

  Returns:
    the appropriate name checker

### getCaller

    public final XPathContext getCaller()

  Get the calling XPathContext (the next one down the stack). This will be null if unknown, or if the bottom of the stack has been reached.

  Specified by:
    `getCaller` in interface `XPathContext`
  Returns:
    the XPathContext of the calling expression

### setCurrentIterator

    public void setCurrentIterator(SequenceIterator iter)

  Set a new sequence iterator.

  Specified by:
    `setCurrentIterator` in interface `XPathContext`
  Parameters:
    `iter` - the current iterator. The context item, position, and size are determined by reference to the current iterator.

### getCurrentIterator

    public final SequenceIterator getCurrentIterator()

  Get the current iterator. This encapsulates the context item, context position, and context size.

  Specified by:
    `getCurrentIterator` in interface `XPathContext`
  Returns:
    the current iterator, or null if there is no current iterator (which means the context item, position, and size are undefined).

### getContextPosition

    public final int getContextPosition()
                                 throws XPathException

  Get the context position (the position of the context item)

  Specified by:
    `getContextPosition` in interface `XPathContext`
  Returns:
    the context position (starting at one)
  Throws:
    `XPathException` - if the context position is undefined

### getContextItem

    public final Item getContextItem()

  Get the context item

  Specified by:
    `getContextItem` in interface `XPathContext`
  Returns:
    the context item, or null if the context item is undefined

### getLast

    public final int getLast()
                      throws XPathException

  Get the context size (the position of the last item in the current node list)

  Specified by:
    `getLast` in interface `XPathContext`
  Returns:
    the context size
  Throws:
    `XPathException` - if the context position is undefined

### isAtLast

    public final boolean isAtLast()
                           throws XPathException

  Determine whether the context position is the same as the context size that is, whether position()=last()

  Specified by:
    `isAtLast` in interface `XPathContext`
  Returns:
    true if the context position is the same as the context size.
  Throws:
    `XPathException`

### getCollation

    public final StringCollator getCollation(String name)
                                      throws XPathException

  Get a named collation

  Specified by:
    `getCollation` in interface `XPathContext`
  Parameters:
    `name` - the name (URI) of the required collation
  Returns:
    a StringCollator representing the collation
  Throws:
    `XPathException` - if the collation is not recognized

### getStackFrame

    public StackFrame getStackFrame()

  Get a reference to the local stack frame for variables. Note that it's the caller's job to make a local copy of this. This is used for creating a Closure containing a retained copy of the variables for delayed evaluation.

  Specified by:
    `getStackFrame` in interface `XPathContext`
  Returns:
    array of variables.

### evaluateLocalVariable

    public ValueRepresentation evaluateLocalVariable(int slotnumber)

  Get the value of a local variable, identified by its slot number

  Specified by:
    `evaluateLocalVariable` in interface `XPathContext`
  Parameters:
    `slotnumber` - the slot number allocated at compile time to the variable, which identifies its position within the local stack frame
  Returns:
    the value of the variable.

### setLocalVariable

    public void setLocalVariable(int slotnumber,
                                 ValueRepresentation value)

  Set the value of a local variable, identified by its slot number

  Specified by:
    `setLocalVariable` in interface `XPathContext`
  Parameters:
    `slotnumber` - the slot number allocated at compile time to the variable, which identifies its position within the local stack frame
    `value` - the value of the variable

### changeOutputDestination

    public void changeOutputDestination(Receiver receiver,
                                        boolean isFinal,
                                        int validation,
                                        SchemaType schemaType)
                                 throws XPathException

  Set a new output destination, supplying the output format details.
  This affects all further output until resetOutputDestination() is called. Note that it is the caller's responsibility to close the Writer after use.

  Specified by:
    `changeOutputDestination` in interface `XPathContext`
  Parameters:
    `validation` - Validation to be performed on the output document
    `schemaType` - schema type against which the output is to be validated, if any
  Throws:
    `XPathException` - if any dynamic error occurs; and specifically, if an attempt is made to switch to a final output destination while writing a temporary tree or sequence @param isFinal true if the destination is a final result tree (either the principal output or a secondary result tree); false if

### setTemporaryReceiver

    public void setTemporaryReceiver(SequenceReceiver out)

  Set the output destination to write to a sequence.
  This affects all further output until resetOutputDestination() is called.

  Specified by:
    `setTemporaryReceiver` in interface `XPathContext`
  Parameters:
    `out` - The SequenceReceiver to be used

### setReceiver

    public void setReceiver(SequenceReceiver receiver)

  Change the Receiver to which output is written

  Specified by:
    `setReceiver` in interface `XPathContext`
  Parameters:
    `receiver` - the SequenceReceiver to be used

### getReceiver

    public final SequenceReceiver getReceiver()

  Get the Receiver to which output is currently being written.

  Specified by:
    `getReceiver` in interface `XPathContext`
  Returns:
    the current Receiver

### useLocalParameter

    public int useLocalParameter(StructuredQName qName,
                                 LocalParam binding,
                                 boolean isTunnel)
                          throws XPathException

  Use local parameter. This is called when a local xsl:param element is processed. If a parameter of the relevant name was supplied, it is bound to the xsl:param element. Otherwise the method returns false, so the xsl:param default will be evaluated

  Specified by:
    `useLocalParameter` in interface `XPathContext`
  Parameters:
    `qName` - The fingerprint of the parameter name
    `binding` - The XSLParam element to bind its value to
    `isTunnel` - True if a tunnel parameter is required, else false
  Returns:
    ParameterSet.NOT_SUPPLIED, ParameterSet.SUPPLIED, or ParameterSet.SUPPLIED_AND_CHECKED
  Throws:
    `XPathException`

### getCurrentMode

    public Mode getCurrentMode()

  Get the current mode.

  Specified by:
    `getCurrentMode` in interface `XPathContext`
  Returns:
    the current mode

### getCurrentTemplateRule

    public Rule getCurrentTemplateRule()

  Get the current template. This is used to support xsl:apply-imports

  Specified by:
    `getCurrentTemplateRule` in interface `XPathContext`
  Returns:
    the current template

### getCurrentGroupIterator

    public GroupIterator getCurrentGroupIterator()

  Get the current group iterator. This supports the current-group() and current-grouping-key() functions in XSLT 2.0

  Specified by:
    `getCurrentGroupIterator` in interface `XPathContext`
  Returns:
    the current grouped collection

### getCurrentRegexIterator

    public RegexIterator getCurrentRegexIterator()

  Get the current regex iterator. This supports the functionality of the regex-group() function in XSLT 2.0.

  Specified by:
    `getCurrentRegexIterator` in interface `XPathContext`
  Returns:
    the current regular expressions iterator

### getCurrentDateTime

    public DateTimeValue getCurrentDateTime()

  Get the current date and time for this query or transformation. All calls during one transformation return the same answer.

  Specified by:
    `getCurrentDateTime` in interface `XPathContext`
  Returns:
    Get the current date and time. This will deliver the same value for repeated calls within the same transformation

### getImplicitTimezone

    public final int getImplicitTimezone()

  Get the implicit timezone, as a positive or negative offset from UTC in minutes. The range is -14hours to +14hours

  Specified by:
    `getImplicitTimezone` in interface `XPathContext`
  Returns:
    the implicit timezone as an offset from UTC in minutes

### setTemporaryOutputState

    public void setTemporaryOutputState(boolean temp)

  Mark the context as being in (or not in) temporary output state

  Parameters:
    `temp` - true to set temporary output state; false to unset it

### iterateStackFrames

    public Iterator iterateStackFrames()

  Get the context stack. This method returns an iterator whose items are instances of `ContextStackFrame`, starting with the top-most stackframe and ending at the point the query or transformation was invoked by a calling application.

  Specified by:
    `iterateStackFrames` in interface `XPathContext`
  Returns:
    an iterator over a copy of the run-time call stack

### setCurrentException

    public void setCurrentException(XPathException exception)

  Set the current exception (in saxon:catch)

  Parameters:
    `exception` - the current exception

### getCurrentException

    public XPathException getCurrentException()

  Get the current exception (in saxon:catch)

  Specified by:
    `getCurrentException` in interface `XPathContext`
  Returns:
    the current exception, or null if there is none defined

Copyright (c) 2004-2010 Saxonica Limited. All rights reserved.