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## net.sf.saxon.pull
Class PullFilter

    java.lang.Object
      net.sf.saxon.pull.PullFilter

All Implemented Interfaces:
  PullProvider

Direct Known Subclasses:
  DocumentEventIgnorer, ElementNameTracker, PullNamespaceReducer, PullPushTee, PullTracer

public class PullFilter
extends java.lang.Object
implements PullProvider

PullFilter is a pass-through filter class that links one PullProvider to another PullProvider in a pipeline. This class passes all events through completely unchanged. The class is designed so that subclasses can modify this behavior by altering some of the events.

Field Summary
`protected int` | `currentEvent`

Fields inherited from interface net.sf.saxon.pull.PullProvider
`ATOMIC_VALUE, ATTRIBUTE, COMMENT, END_DOCUMENT, END_ELEMENT, END_OF_INPUT, NAMESPACE, PROCESSING_INSTRUCTION, START_DOCUMENT, START_ELEMENT, START_OF_INPUT, TEXT`

Constructor Summary
`PullFilter(PullProvider base)` Create a PullFilter

Method Summary
`void` | `close()` Close the event reader.
`int` | `current()` Get the event most recently returned by next(), or by other calls that change the position, for example getStringValue() and skipToMatchingEnd().
`AtomicValue` | `getAtomicValue()` Get an atomic value.
`AttributeCollection` | `getAttributes()` Get the attributes associated with the current element.
`int` | `getFingerprint()` Get the fingerprint of the name of the element.
`int` | `getNameCode()` Get the nameCode identifying the name of the current node.
`NamePool` | `getNamePool()` Helper method to get the current namePool
`NamespaceDeclarations` | `getNamespaceDeclarations()` Get the namespace declarations associated with the current element.
`PipelineConfiguration` | `getPipelineConfiguration()` Get configuration information.
`javax.xml.transform.SourceLocator` | `getSourceLocator()` Get the location of the current event.
`java.lang.CharSequence` | `getStringValue()` Get the string value of the current element, text node, processing-instruction, or top-level attribute or namespace node, or atomic value.
`int` | `getTypeAnnotation()` Get the type annotation of the current attribute or element node, or atomic value.
`PullProvider` | `getUnderlyingProvider()` Get the underlying PullProvider
`int` | `next()` Get the next event.
`void` | `setPipelineConfiguration(PipelineConfiguration pipe)` Set configuration information.
`int` | `skipToMatchingEnd()` Skip the current subtree.

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

Field Detail

### currentEvent

    protected int currentEvent

Constructor Detail

### PullFilter

    public PullFilter(PullProvider base)

  Create a PullFilter

Parameters:
  `base` - the PullProvider to which requests are to be passed

Method Detail

### setPipelineConfiguration

    public void setPipelineConfiguration(PipelineConfiguration pipe)

  Set configuration information. This must only be called before any events have been read.

  Specified by:
    `setPipelineConfiguration` in interface `PullProvider`

### getPipelineConfiguration

    public PipelineConfiguration getPipelineConfiguration()

  Get configuration information.

  Specified by:
    `getPipelineConfiguration` in interface `PullProvider`

### getNamePool

    public final NamePool getNamePool()

  Helper method to get the current namePool

### getUnderlyingProvider

    public PullProvider getUnderlyingProvider()

  Get the underlying PullProvider

### next

    public int next()
             throws XPathException

  Get the next event.

  Note that a subclass that overrides this method is responsible for ensuring that current() works properly. This can be achieved by setting the field currentEvent to the event returned by any call on next().

  Specified by:
    `next` in interface `PullProvider`
  Returns:
    an integer code indicating the type of event. The code `PullProvider.END_OF_INPUT` is returned at the end of the sequence.
  Throws:
    `XPathException`

### current

    public int current()

  Get the event most recently returned by next(), or by other calls that change the position, for example getStringValue() and skipToMatchingEnd(). This method does not change the position of the PullProvider.

  Specified by:
    `current` in interface `PullProvider`
  Returns:
    the current event

### getAttributes

    public AttributeCollection getAttributes()
                                      throws XPathException

  Get the attributes associated with the current element. This method must be called only after a START_ELEMENT event has been notified. The contents of the returned AttributeCollection are guaranteed to remain unchanged until the next START_ELEMENT event, but may be modified thereafter. The object should not be modified by the client.

  Attributes may be read before or after reading the namespaces of an element, but must not be read after the first child node has been read, or after calling one of the methods skipToEnd(), getStringValue(), or getTypedValue().

  Specified by:
    `getAttributes` in interface `PullProvider`
  Returns:
    an AttributeCollection representing the attributes of the element that has just been notified.
  Throws:
    `XPathException`

### getNamespaceDeclarations

    public NamespaceDeclarations getNamespaceDeclarations()
                                                   throws XPathException

  Get the namespace declarations associated with the current element. This method must be called only after a START_ELEMENT event has been notified. In the case of a top-level START_ELEMENT event (that is, an element that either has no parent node, or whose parent is not included in the sequence being read), the NamespaceDeclarations object returned will contain a namespace declaration for each namespace that is in-scope for this element node. In the case of a non-top-level element, the NamespaceDeclarations will contain a set of namespace declarations and undeclarations, representing the differences between this element and its parent.

  It is permissible for this method to return namespace declarations that are redundant.

  The NamespaceDeclarations object is guaranteed to remain unchanged until the next START_ELEMENT event, but may then be overwritten. The object should not be modified by the client.

  Namespaces may be read before or after reading the attributes of an element, but must not be read after the first child node has been read, or after calling one of the methods skipToEnd(), getStringValue(), or getTypedValue().

  *

  Specified by:
    `getNamespaceDeclarations` in interface `PullProvider`
  Throws:
    `XPathException`

### skipToMatchingEnd

    public int skipToMatchingEnd()
                          throws XPathException

  Skip the current subtree. This method may be called only immediately after a START_DOCUMENT or START_ELEMENT event. This call returns the matching END_DOCUMENT or END_ELEMENT event; the next call on next() will return the event following the END_DOCUMENT or END_ELEMENT.

  Specified by:
    `skipToMatchingEnd` in interface `PullProvider`
  Throws:
    `XPathException`

### close

    public void close()

  Close the event reader. This indicates that no further events are required. It is not necessary to close an event reader after `PullProvider.END_OF_INPUT` has been reported, but it is recommended to close it if reading terminates prematurely. Once an event reader has been closed, the effect of further calls on next() is undefined.

  Specified by:
    `close` in interface `PullProvider`

### getNameCode

    public int getNameCode()

  Get the nameCode identifying the name of the current node. This method can be used after the `PullProvider.START_ELEMENT`, `PullProvider.PROCESSING_INSTRUCTION`, `PullProvider.ATTRIBUTE`, or `PullProvider.NAMESPACE` events. With some PullProvider implementations, it can also be used after `PullProvider.END_ELEMENT`, but this is not guaranteed: a client who requires the information at that point (for example, to do serialization) should insert an `ElementNameTracker` into the pipeline. If called at other times, the result is undefined and may result in an IllegalStateException. If called when the current node is an unnamed namespace node (a node representing the default namespace) the returned value is -1.

  Specified by:
    `getNameCode` in interface `PullProvider`
  Returns:
    the nameCode. The nameCode can be used to obtain the prefix, local name, and namespace URI from the name pool.

### getFingerprint

    public int getFingerprint()

  Get the fingerprint of the name of the element. This is similar to the nameCode, except that it does not contain any information about the prefix: so two elements with the same fingerprint have the same name, excluding prefix. This method can be used after the `PullProvider.START_ELEMENT`, `PullProvider.END_ELEMENT`, `PullProvider.PROCESSING_INSTRUCTION`, `PullProvider.ATTRIBUTE`, or `PullProvider.NAMESPACE` events. If called at other times, the result is undefined and may result in an IllegalStateException. If called when the current node is an unnamed namespace node (a node representing the default namespace) the returned value is -1.

  Specified by:
    `getFingerprint` in interface `PullProvider`
  Returns:
    the fingerprint. The fingerprint can be used to obtain the local name and namespace URI from the name pool.

### getStringValue

    public java.lang.CharSequence getStringValue()
                                          throws XPathException

  Get the string value of the current element, text node, processing-instruction, or top-level attribute or namespace node, or atomic value.

  In other situations the result is undefined and may result in an IllegalStateException.

  If the most recent event was a `PullProvider.START_ELEMENT`, this method causes the content of the element to be read. The next event notified will be the corresponding `PullProvider.END_ELEMENT`.

  Specified by:
    `getStringValue` in interface `PullProvider`
  Returns:
    the String Value of the node in question, defined according to the rules in the XPath data model.
  Throws:
    `XPathException`

### getAtomicValue

    public AtomicValue getAtomicValue()

  Get an atomic value. This call may be used only when the last event reported was ATOMIC_VALUE. This indicates that the PullProvider is reading a sequence that contains a free-standing atomic value; it is never used when reading the content of a node.

  Specified by:
    `getAtomicValue` in interface `PullProvider`

### getTypeAnnotation

    public int getTypeAnnotation()

  Get the type annotation of the current attribute or element node, or atomic value. The result of this method is undefined unless the most recent event was START_ELEMENT, ATTRIBUTE, or ATOMIC_VALUE.

  Specified by:
    `getTypeAnnotation` in interface `PullProvider`
  Returns:
    the type annotation. This code is the fingerprint of a type name, which may be resolved to a `SchemaType` by access to the Configuration.

### getSourceLocator

    public javax.xml.transform.SourceLocator getSourceLocator()

  Get the location of the current event. For an event stream representing a real document, the location information should identify the location in the lexical XML source. For a constructed document, it should identify the location in the query or stylesheet that caused the node to be created. A value of null can be returned if no location information is available.

  Specified by:
    `getSourceLocator` in interface `PullProvider`

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