net.sf.saxon.query
Class QueryReader

java.lang.Object
  net.sf.saxon.query.QueryReader

public class QueryReader
extends Object

This class contains static methods used to read a query as a byte stream, infer the encoding if necessary, and return the text of the query as a string; also methods to import functions and variables from one module into another, and check their consistency.

Method Summary

static String	readEncoding(InputStream is) Read an input stream non-destructively to determine the encoding from the Query Prolog
static String	readInputStream(InputStream is, String encoding, NameChecker nameChecker) Read a query from an InputStream.
static String	readSourceQuery(StreamSource ss, NameChecker nameChecker) Read a query module given a StreamSource

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

readSourceQuery

public static String readSourceQuery(StreamSource ss,
                                     NameChecker nameChecker)
                              throws XPathException

Read a query module given a StreamSource

Parameters:

ss - the supplied StreamSource. This must contain a non-null systemID which defines the base URI of the query module, and either an InputStream or a Reader containing the query text. In the case of an InputStream the method attempts to infer the encoding; in the case of a Reader, this has already been done, and the encoding specified within the query itself is ignored.

The method reads from the InputStream or Reader contained in the StreamSource up to the end of file unless a fatal error occurs. It does not close the InputStream or Reader; this is the caller's responsibility.

nameChecker - this checks XML names against either the XML 1.0 or XML 1.1 rules

Returns:

the text of the query

Throws:

XPathException

readEncoding

public static String readEncoding(InputStream is)
                           throws XPathException

Read an input stream non-destructively to determine the encoding from the Query Prolog

Parameters:

is - the input stream: this must satisfy the precondition is.markSupported() = true.

Returns:

the encoding to be used: defaults to UTF-8 if no encoding was specified explicitly in the query prolog

Throws:

XPathException - if the input stream cannot be read

readInputStream

public static String readInputStream(InputStream is,
                                     String encoding,
                                     NameChecker nameChecker)
                              throws XPathException

Read a query from an InputStream. The method checks that all characters are valid XML characters, and also performs normalization of line endings.

Parameters:

is - the input stream

encoding - the encoding, or null if the encoding is unknown

nameChecker - the nameChecker to be used for checking characters

Returns:

the content of the InputStream as a string

Throws:

XPathException