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## com.saxonica.stream.watch
Class WatchManager

    java.lang.Object
      net.sf.saxon.event.SequenceReceiver
          net.sf.saxon.event.ProxyReceiver
              com.saxonica.stream.watch.WatchManager

All Implemented Interfaces:
  Result, Receiver, NamespaceResolver

Direct Known Subclasses:
  ConstraintChecker

    public class WatchManager

extends ProxyReceiver
implements NamespaceResolver

This class sits on a push pipeline and evaluates the passing element and attribute nodes. One or more Watch objects can be registered with the pipeline at any time; element and attribute events are notified to the active Watch objects. A watch that is added immediately after a startElement call is automatically dropped at the corresponding endElement call. If a Watch matches a startElement call, then it becomes an active Watch; it is automatically deactivated (but not dropped) at the corresponding endElement call.

A Watch is not itself a receiver, but it can nominate a Receiver to receive all events while it is active. It will stop receiving events when it is deactivated.

Field Summary
`protected Stack<List<com.saxonica.stream.watch.WatchManager.ClosedownAction>>` | `activeWatchStack`
`protected int` | `elementStackTop`
`protected List<Watch>` | `watchList`

Fields inherited from class net.sf.saxon.event.ProxyReceiver
`nextReceiver`

Fields inherited from class net.sf.saxon.event.SequenceReceiver
`pipelineConfiguration, previousAtomic, systemId`

Fields inherited from interface javax.xml.transform.Result
`PI_DISABLE_OUTPUT_ESCAPING, PI_ENABLE_OUTPUT_ESCAPING`

Constructor Summary
`WatchManager(StartTagBuffer startTagBuffer, Configuration config)` Create a WatchManager

Method Summary
`protected void` | `addPrearrangedWatches()`
`void` | `addWatch(Watch watch)` Add a new Watch.
`void` | `attribute(int nameCode, int typeCode, CharSequence value, int locationId, int properties)` Notify an attribute
`void` | `characters(CharSequence chars, int locationId, int properties)` Text node
`void` | `comment(CharSequence chars, int locationId, int properties)` Output a comment
`void` | `endDocument()` Notify the end of a document node
`void` | `endElement()` Notify end of element
`FleetingDocumentNode` | `getDocumentNode()`
`StartTagBuffer` | `getStartTagBuffer()`
`String` | `getURIForPrefix(String prefix, boolean useDefault)` Get the namespace URI corresponding to a given prefix.
`XPathContext` | `getXPathContext()`
`Iterator` | `iteratePrefixes()` Get an iterator over all the prefixes declared in this namespace context.
`void` | `namespace(int namespaceCode, int properties)` Notify a namespace
`void` | `processingInstruction(String target, CharSequence data, int locationId, int properties)` Processing Instruction
`void` | `setXPathContext(XPathContext context)`
`void` | `startContent()` Start element content (called after all the attributes and namespaces have been processed)
`void` | `startDocument(int properties)` Start of a document node.
`void` | `startElement(int nameCode, int typeCode, int locationId, int properties)` Output element start tag
`boolean` | `usesTypeAnnotations()` Ask whether this Receiver (or the downstream pipeline) makes any use of the type annotations supplied on element and attribute events

Methods inherited from class net.sf.saxon.event.ProxyReceiver
`append, close, getConfiguration, getDocumentLocator, getNamePool, getUnderlyingReceiver, open, setPipelineConfiguration, setSystemId, setUnderlyingReceiver, setUnparsedEntity`

Methods inherited from class net.sf.saxon.event.SequenceReceiver
`append, getPipelineConfiguration, getSystemId`

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

Field Detail

### elementStackTop

    protected int elementStackTop

### watchList

    protected List<Watch> watchList

### activeWatchStack

    protected Stack<List<com.saxonica.stream.watch.WatchManager.ClosedownAction>> activeWatchStack

Constructor Detail

### WatchManager

    public WatchManager(StartTagBuffer startTagBuffer,
                        Configuration config)

  Create a WatchManager

Method Detail

### setXPathContext

    public void setXPathContext(XPathContext context)

### getXPathContext

    public XPathContext getXPathContext()

### getStartTagBuffer

    public StartTagBuffer getStartTagBuffer()

### startDocument

    public void startDocument(int properties)
                       throws XPathException

  Start of a document node.

  Specified by:
    `startDocument` in interface `Receiver`
  Overrides:
    `startDocument` in class `ProxyReceiver`
  Parameters:
    `properties` - bit-significant integer indicating properties of the document node. The definitions of the bits are in class `ReceiverOptions`
  Throws:
    `XPathException`

### startElement

    public void startElement(int nameCode,
                             int typeCode,
                             int locationId,
                             int properties)
                      throws XPathException

  Output element start tag

  Specified by:
    `startElement` in interface `Receiver`
  Overrides:
    `startElement` in class `ProxyReceiver`
  Parameters:
    `nameCode` - integer code identifying the name of the element within the name pool.
    `typeCode` - integer code identifying the element's type within the name pool.
    `locationId` - an integer which can be interpreted using a `LocationProvider` to return information such as line number and system ID. If no location information is available, the value zero is supplied.
    `properties` - properties of the element node
  Throws:
    `XPathException`

### addPrearrangedWatches

    protected void addPrearrangedWatches()
                                  throws XPathException

  Throws:
    `XPathException`

### attribute

    public void attribute(int nameCode,
                          int typeCode,
                          CharSequence value,
                          int locationId,
                          int properties)
                   throws XPathException

  Notify an attribute

  Specified by:
    `attribute` in interface `Receiver`
  Overrides:
    `attribute` in class `ProxyReceiver`
  Parameters:
    `nameCode` - integer identifying the name of the attribute
    `typeCode` - integer identifying the type annotation (ignored)
    `value` - the value of the attribute
    `properties` - additional properties of the attribute
    `locationId` - an integer which can be interpreted using a `LocationProvider` to return information such as line number and system ID. If no location information is available, the value zero is supplied.
  Throws:
    `XPathException` - On any failure to write the attribute

### namespace

    public void namespace(int namespaceCode,
                          int properties)
                   throws XPathException

  Notify a namespace

  Specified by:
    `namespace` in interface `Receiver`
  Overrides:
    `namespace` in class `ProxyReceiver`
  Parameters:
    `namespaceCode` - the namespace code (identifies the prefix and URI)
    `properties` - properties of this event
  Throws:
    `XPathException`

### characters

    public void characters(CharSequence chars,
                           int locationId,
                           int properties)
                    throws XPathException

  Text node

  Specified by:
    `characters` in interface `Receiver`
  Overrides:
    `characters` in class `ProxyReceiver`
  Parameters:
    `chars` - The characters
    `locationId` - an integer which can be interpreted using a `LocationProvider` to return information such as line number and system ID. If no location information is available, the value zero is supplied.
    `properties` - Bit significant value. The following bits are defined:
  DISABLE_ESCAPING
    Disable escaping for this text node
  USE_CDATA
    Output as a CDATA section
  Throws:
    `XPathException`

### endElement

    public void endElement()
                    throws XPathException

  Notify end of element

  Specified by:
    `endElement` in interface `Receiver`
  Overrides:
    `endElement` in class `ProxyReceiver`
  Throws:
    `XPathException`

### endDocument

    public void endDocument()
                     throws XPathException

  Notify the end of a document node

  Specified by:
    `endDocument` in interface `Receiver`
  Overrides:
    `endDocument` in class `ProxyReceiver`
  Throws:
    `XPathException`

### comment

    public void comment(CharSequence chars,
                        int locationId,
                        int properties)
                 throws XPathException

  Output a comment

  Specified by:
    `comment` in interface `Receiver`
  Overrides:
    `comment` in class `ProxyReceiver`
  Parameters:
    `chars` - The content of the comment
    `locationId` - an integer which can be interpreted using a `LocationProvider` to return information such as line number and system ID. If no location information is available, the value zero is supplied.
    `properties` - Additional information about the comment.
  Throws:
    `XPathException`

### processingInstruction

    public void processingInstruction(String target,
                                      CharSequence data,
                                      int locationId,
                                      int properties)
                               throws XPathException

  Processing Instruction

  Specified by:
    `processingInstruction` in interface `Receiver`
  Overrides:
    `processingInstruction` in class `ProxyReceiver`
  Parameters:
    `target` - The PI name. This must be a legal name (it will not be checked).
    `data` - The data portion of the processing instruction
    `locationId` - an integer which can be interpreted using a `LocationProvider` to return information such as line number and system ID. If no location information is available, the value zero is supplied.
    `properties` - Additional information about the PI.
  Throws:
    `XPathException`

### startContent

    public void startContent()
                      throws XPathException

  Start element content (called after all the attributes and namespaces have been processed)

  Specified by:
    `startContent` in interface `Receiver`
  Overrides:
    `startContent` in class `ProxyReceiver`
  Throws:
    `XPathException`

### addWatch

    public void addWatch(Watch watch)
                  throws XPathException

  Add a new Watch. This is associated with the current level in the element stack, and is automatically closed and dropped when the current element goes out of scope.

  Parameters:
    `watch` - the watch to be added
  Throws:
    `XPathException`

### getURIForPrefix

    public String getURIForPrefix(String prefix,
                                  boolean useDefault)

  Get the namespace URI corresponding to a given prefix. Return null if the prefix is not in scope.

  Specified by:
    `getURIForPrefix` in interface `NamespaceResolver`
  Parameters:
    `prefix` - the namespace prefix. May be the zero-length string, indicating that there is no prefix. This indicates either the default namespace or the null namespace, depending on the value of useDefault.
    `useDefault` - true if the default namespace is to be used when the prefix is "". If false, the method returns "" when the prefix is "".
  Returns:
    the uri for the namespace, or null if the prefix is not in scope. The "null namespace" is represented by the pseudo-URI "".

### iteratePrefixes

    public Iterator iteratePrefixes()

  Description copied from interface: `NamespaceResolver`
  Get an iterator over all the prefixes declared in this namespace context. This will include the default namespace (prefix="") and the XML namespace where appropriate

  Specified by:
    `iteratePrefixes` in interface `NamespaceResolver`

### usesTypeAnnotations

    public boolean usesTypeAnnotations()

  Ask whether this Receiver (or the downstream pipeline) makes any use of the type annotations supplied on element and attribute events

  Specified by:
    `usesTypeAnnotations` in interface `Receiver`
  Overrides:
    `usesTypeAnnotations` in class `ProxyReceiver`
  Returns:
    true if the Receiver makes any use of this information. If false, the caller may supply untyped nodes instead of supplying the type annotation

### getDocumentNode

    public FleetingDocumentNode getDocumentNode()

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