Package 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

Modifier and Type	Method	Description
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, IntPredicateProxy nameChecker)	Read a query from an InputStream.
static String	readSourceQuery(Configuration config, StreamSource ss, IntPredicateProxy charChecker)	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 Details

readSourceQuery

public static String readSourceQuery(Configuration config,
 StreamSource ss,
 IntPredicateProxy charChecker)
                              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.

charChecker - this checks XML characters against either the XML 1.0 or XML 1.1 rules

Returns:

the text of the query

Throws:

XPathException - if the input cannot be read

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,
 IntPredicateProxy 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 predicate to be used for checking characters

Returns:

the content of the InputStream as a string

Throws:

XPathException - if the stream cannot be read, for example if there is a problem with the encoding