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	/*
	* reserved comment block
	* DO NOT REMOVE OR ALTER!
	*/
	/*
	* Licensed to the Apache Software Foundation (ASF) under one or more
	* contributor license agreements. See the NOTICE file distributed with
	* this work for additional information regarding copyright ownership.
	* The ASF licenses this file to You under the Apache License, Version 2.0
	* (the "License"); you may not use this file except in compliance with
	* the License. You may obtain a copy of the License at
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	package com.sun.org.apache.xpath.internal.objects;

	import com.sun.org.apache.xalan.internal.res.XSLMessages;
	import com.sun.org.apache.xml.internal.utils.FastStringBuffer;
	import com.sun.org.apache.xml.internal.utils.XMLCharacterRecognizer;
	import com.sun.org.apache.xml.internal.utils.XMLString;
	import com.sun.org.apache.xml.internal.utils.XMLStringFactory;
	import com.sun.org.apache.xpath.internal.res.XPATHErrorResources;

	/**
	* This class will wrap a FastStringBuffer and allow for
	*/
	public class XStringForFSB extends XString
	{
	static final long serialVersionUID = -1533039186550674548L;

	/** The start position in the fsb. */
	int m_start;

	/** The length of the string. */
	int m_length;

	/** If the str() function is called, the string will be cached here. */
	protected String m_strCache = null;

	/** cached hash code */
	protected int m_hash = 0;

	/**
	* Construct a XNodeSet object.
	*
	* @param val FastStringBuffer object this will wrap, must be non-null.
	* @param start The start position in the array.
	* @param length The number of characters to read from the array.
	*/
	public XStringForFSB(FastStringBuffer val, int start, int length)
	{

	super(val);

	m_start = start;
	m_length = length;

	if (null == val)
	throw new IllegalArgumentException(
	XSLMessages.createXPATHMessage(XPATHErrorResources.ER_FASTSTRINGBUFFER_CANNOT_BE_NULL, null));
	}

	/**
	* Construct a XNodeSet object.
	*
	* @param val String object this will wrap.
	*/
	private XStringForFSB(String val)
	{

	super(val);

	throw new IllegalArgumentException(
	XSLMessages.createXPATHMessage(XPATHErrorResources.ER_FSB_CANNOT_TAKE_STRING, null)); // "XStringForFSB can not take a string for an argument!");
	}

	/**
	* Cast result object to a string.
	*
	* @return The string this wraps or the empty string if null
	*/
	public FastStringBuffer fsb()
	{
	return ((FastStringBuffer) m_obj);
	}

	/**
	* Cast result object to a string.
	*
	* @return The string this wraps or the empty string if null
	*/
	public void appendToFsb(com.sun.org.apache.xml.internal.utils.FastStringBuffer fsb)
	{
	// %OPT% !!! FSB has to be updated to take partial fsb's for append.
	fsb.append(str());
	}

	/**
	* Tell if this object contains a java String object.
	*
	* @return true if this XMLString can return a string without creating one.
	*/
	public boolean hasString()
	{
	return (null != m_strCache);
	}

	// /** NEEDSDOC Field strCount */
	// public static int strCount = 0;
	//
	// /** NEEDSDOC Field xtable */
	// static java.util.Hashtable xtable = new java.util.Hashtable();

	/**
	* Since this object is incomplete without the length and the offset, we
	* have to convert to a string when this function is called.
	*
	* @return The java String representation of this object.
	*/
	public Object object()
	{
	return str();
	}

	/**
	* Cast result object to a string.
	*
	* @return The string this wraps or the empty string if null
	*/
	public String str()
	{

	if (null == m_strCache)
	{
	m_strCache = fsb().getString(m_start, m_length);

	// strCount++;
	//
	// RuntimeException e = new RuntimeException("Bad! Bad!");
	// java.io.CharArrayWriter writer = new java.io.CharArrayWriter();
	// java.io.PrintWriter pw = new java.io.PrintWriter(writer);
	//
	// e.printStackTrace(pw);
	//
	// String str = writer.toString();
	//
	// str = str.substring(0, 600);
	//
	// if (null == xtable.get(str))
	// {
	// xtable.put(str, str);
	// System.out.println(str);
	// }
	// System.out.println("strCount: " + strCount);

	// throw e;
	// e.printStackTrace();
	// System.exit(-1);
	}

	return m_strCache;
	}

	/**
	* Directly call the
	* characters method on the passed ContentHandler for the
	* string-value. Multiple calls to the
	* ContentHandler's characters methods may well occur for a single call to
	* this method.
	*
	* @param ch A non-null reference to a ContentHandler.
	*
	* @throws org.xml.sax.SAXException
	*/
	public void dispatchCharactersEvents(org.xml.sax.ContentHandler ch)
	throws org.xml.sax.SAXException
	{
	fsb().sendSAXcharacters(ch, m_start, m_length);
	}

	/**
	* Directly call the
	* comment method on the passed LexicalHandler for the
	* string-value.
	*
	* @param lh A non-null reference to a LexicalHandler.
	*
	* @throws org.xml.sax.SAXException
	*/
	public void dispatchAsComment(org.xml.sax.ext.LexicalHandler lh)
	throws org.xml.sax.SAXException
	{
	fsb().sendSAXComment(lh, m_start, m_length);
	}

	/**
	* Returns the length of this string.
	*
	* @return the length of the sequence of characters represented by this
	* object.
	*/
	public int length()
	{
	return m_length;
	}

	/**
	* Returns the character at the specified index. An index ranges
	* from <code>0</code> to <code>length() - 1</code>. The first character
	* of the sequence is at index <code>0</code>, the next at index
	* <code>1</code>, and so on, as for array indexing.
	*
	* @param index the index of the character.
	* @return the character at the specified index of this string.
	* The first character is at index <code>0</code>.
	* @exception IndexOutOfBoundsException if the <code>index</code>
	* argument is negative or not less than the length of this
	* string.
	*/
	public char charAt(int index)
	{
	return fsb().charAt(m_start + index);
	}

	/**
	* Copies characters from this string into the destination character
	* array.
	*
	* @param srcBegin index of the first character in the string
	* to copy.
	* @param srcEnd index after the last character in the string
	* to copy.
	* @param dst the destination array.
	* @param dstBegin the start offset in the destination array.
	* @exception IndexOutOfBoundsException If any of the following
	* is true:
	* <ul><li><code>srcBegin</code> is negative.
	* <li><code>srcBegin</code> is greater than <code>srcEnd</code>
	* <li><code>srcEnd</code> is greater than the length of this
	* string
	* <li><code>dstBegin</code> is negative
	* <li><code>dstBegin+(srcEnd-srcBegin)</code> is larger than
	* <code>dst.length</code></ul>
	* @exception NullPointerException if <code>dst</code> is <code>null</code>
	*/
	public void getChars(int srcBegin, int srcEnd, char dst[], int dstBegin)
	{

	// %OPT% Need to call this on FSB when it is implemented.
	// %UNTESTED% (I don't think anyone calls this yet?)
	int n = srcEnd - srcBegin;

	if (n > m_length)
	n = m_length;

	if (n > (dst.length - dstBegin))
	n = (dst.length - dstBegin);

	int end = srcBegin + m_start + n;
	int d = dstBegin;
	FastStringBuffer fsb = fsb();

	for (int i = srcBegin + m_start; i < end; i++)
	{
	dst[d++] = fsb.charAt(i);
	}
	}

	/**
	* Compares this string to the specified object.
	* The result is <code>true</code> if and only if the argument is not
	* <code>null</code> and is a <code>String</code> object that represents
	* the same sequence of characters as this object.
	*
	* @param obj2 the object to compare this <code>String</code>
	* against.
	*
	* @return <code>true</code> if the <code>String </code>are equal;
	* <code>false</code> otherwise.
	* @see java.lang.String#compareTo(java.lang.String)
	* @see java.lang.String#equalsIgnoreCase(java.lang.String)
	*/
	public boolean equals(XMLString obj2)
	{

	if (this == obj2)
	{
	return true;
	}

	int n = m_length;

	if (n == obj2.length())
	{
	FastStringBuffer fsb = fsb();
	int i = m_start;
	int j = 0;

	while (n-- != 0)
	{
	if (fsb.charAt(i) != obj2.charAt(j))
	{
	return false;
	}

	i++;
	j++;
	}

	return true;
	}

	return false;
	}

	/**
	* Tell if two objects are functionally equal.
	*
	* @param obj2 Object to compare this to
	*
	* @return true if the two objects are equal
	*
	* @throws javax.xml.transform.TransformerException
	*/
	public boolean equals(XObject obj2)
	{

	if (this == obj2)
	{
	return true;
	}
	if(obj2.getType() == XObject.CLASS_NUMBER)
	return obj2.equals(this);

	String str = obj2.str();
	int n = m_length;

	if (n == str.length())
	{
	FastStringBuffer fsb = fsb();
	int i = m_start;
	int j = 0;

	while (n-- != 0)
	{
	if (fsb.charAt(i) != str.charAt(j))
	{
	return false;
	}

	i++;
	j++;
	}

	return true;
	}

	return false;
	}

	/**
	* Tell if two objects are functionally equal.
	*
	* @param anotherString Object to compare this to
	*
	* @return true if the two objects are equal
	*
	* @throws javax.xml.transform.TransformerException
	*/
	public boolean equals(String anotherString)
	{

	int n = m_length;

	if (n == anotherString.length())
	{
	FastStringBuffer fsb = fsb();
	int i = m_start;
	int j = 0;

	while (n-- != 0)
	{
	if (fsb.charAt(i) != anotherString.charAt(j))
	{
	return false;
	}

	i++;
	j++;
	}

	return true;
	}

	return false;
	}

	/**
	* Compares this string to the specified object.
	* The result is <code>true</code> if and only if the argument is not
	* <code>null</code> and is a <code>String</code> object that represents
	* the same sequence of characters as this object.
	*
	* @param obj2 the object to compare this <code>String</code>
	* against.
	*
	* @return <code>true</code> if the <code>String </code>are equal;
	* <code>false</code> otherwise.
	* @see java.lang.String#compareTo(java.lang.String)
	* @see java.lang.String#equalsIgnoreCase(java.lang.String)
	*/
	public boolean equals(Object obj2)
	{

	if (null == obj2)
	return false;

	if(obj2 instanceof XNumber)
	return obj2.equals(this);

	// In order to handle the 'all' semantics of
	// nodeset comparisons, we always call the
	// nodeset function.
	else if (obj2 instanceof XNodeSet)
	return obj2.equals(this);
	else if (obj2 instanceof XStringForFSB)
	return equals((XMLString) obj2);
	else
	return equals(obj2.toString());
	}

	/**
	* Compares this <code>String</code> to another <code>String</code>,
	* ignoring case considerations. Two strings are considered equal
	* ignoring case if they are of the same length, and corresponding
	* characters in the two strings are equal ignoring case.
	*
	* @param anotherString the <code>String</code> to compare this
	* <code>String</code> against.
	* @return <code>true</code> if the argument is not <code>null</code>
	* and the <code>String</code>s are equal,
	* ignoring case; <code>false</code> otherwise.
	* @see #equals(Object)
	* @see java.lang.Character#toLowerCase(char)
	* @see java.lang.Character#toUpperCase(char)
	*/
	public boolean equalsIgnoreCase(String anotherString)
	{
	return (m_length == anotherString.length())
	? str().equalsIgnoreCase(anotherString) : false;
	}

	/**
	* Compares two strings lexicographically.
	*
	* @param xstr the <code>String</code> to be compared.
	*
	* @return the value <code>0</code> if the argument string is equal to
	* this string; a value less than <code>0</code> if this string
	* is lexicographically less than the string argument; and a
	* value greater than <code>0</code> if this string is
	* lexicographically greater than the string argument.
	* @exception java.lang.NullPointerException if <code>anotherString</code>
	* is <code>null</code>.
	*/
	public int compareTo(XMLString xstr)
	{

	int len1 = m_length;
	int len2 = xstr.length();
	int n = Math.min(len1, len2);
	FastStringBuffer fsb = fsb();
	int i = m_start;
	int j = 0;

	while (n-- != 0)
	{
	char c1 = fsb.charAt(i);
	char c2 = xstr.charAt(j);

	if (c1 != c2)
	{
	return c1 - c2;
	}

	i++;
	j++;
	}

	return len1 - len2;
	}

	/**
	* Compares two strings lexicographically, ignoring case considerations.
	* This method returns an integer whose sign is that of
	* <code>this.toUpperCase().toLowerCase().compareTo(
	* str.toUpperCase().toLowerCase())</code>.
	* <p>
	* Note that this method does <em>not</em> take locale into account,
	* and will result in an unsatisfactory ordering for certain locales.
	* The java.text package provides <em>collators</em> to allow
	* locale-sensitive ordering.
	*
	* @param xstr the <code>String</code> to be compared.
	*
	* @return a negative integer, zero, or a positive integer as the
	* the specified String is greater than, equal to, or less
	* than this String, ignoring case considerations.
	* @see java.text.Collator#compare(String, String)
	* @since 1.2
	*/
	public int compareToIgnoreCase(XMLString xstr)
	{

	int len1 = m_length;
	int len2 = xstr.length();
	int n = Math.min(len1, len2);
	FastStringBuffer fsb = fsb();
	int i = m_start;
	int j = 0;

	while (n-- != 0)
	{
	char c1 = Character.toLowerCase(fsb.charAt(i));
	char c2 = Character.toLowerCase(xstr.charAt(j));

	if (c1 != c2)
	{
	return c1 - c2;
	}

	i++;
	j++;
	}

	return len1 - len2;
	}

	/**
	* Returns a hashcode for this string. The hashcode for a
	* <code>String</code> object is computed as
	* <blockquote><pre>
	* s[0]31^(n-1) + s[1]31^(n-2) + ... + s[n-1]
	* </pre></blockquote>
	* using <code>int</code> arithmetic, where <code>s[i]</code> is the
	* <i>i</i>th character of the string, <code>n</code> is the length of
	* the string, and <code>^</code> indicates exponentiation.
	* (The hash value of the empty string is zero.)
	*
	* @return a hash code value for this object.
	*/
	public int hashCode()
	{
	// Commenting this out because in JDK1.1.8 and VJ++
	// we don't match XMLStrings. Defaulting to the super
	// causes us to create a string, but at this point
	// this only seems to get called in key processing.
	// Maybe we can live with it?

	/*
	int h = m_hash;

	if (h == 0)
	{
	int off = m_start;
	int len = m_length;
	FastStringBuffer fsb = fsb();

	for (int i = 0; i < len; i++)
	{
	h = 31 * h + fsb.charAt(off);

	off++;
	}

	m_hash = h;
	}
	*/

	return super.hashCode(); // h;
	}

	/**
	* Tests if this string starts with the specified prefix beginning
	* a specified index.
	*
	* @param prefix the prefix.
	* @param toffset where to begin looking in the string.
	* @return <code>true</code> if the character sequence represented by the
	* argument is a prefix of the substring of this object starting
	* at index <code>toffset</code>; <code>false</code> otherwise.
	* The result is <code>false</code> if <code>toffset</code> is
	* negative or greater than the length of this
	* <code>String</code> object; otherwise the result is the same
	* as the result of the expression
	* <pre>
	* this.subString(toffset).startsWith(prefix)
	* </pre>
	* @exception java.lang.NullPointerException if <code>prefix</code> is
	* <code>null</code>.
	*/
	public boolean startsWith(XMLString prefix, int toffset)
	{

	FastStringBuffer fsb = fsb();
	int to = m_start + toffset;
	int tlim = m_start + m_length;
	int po = 0;
	int pc = prefix.length();

	// Note: toffset might be near -1>>>1.
	if ((toffset < 0) \|\| (toffset > m_length - pc))
	{
	return false;
	}

	while (--pc >= 0)
	{
	if (fsb.charAt(to) != prefix.charAt(po))
	{
	return false;
	}

	to++;
	po++;
	}

	return true;
	}

	/**
	* Tests if this string starts with the specified prefix.
	*
	* @param prefix the prefix.
	* @return <code>true</code> if the character sequence represented by the
	* argument is a prefix of the character sequence represented by
	* this string; <code>false</code> otherwise.
	* Note also that <code>true</code> will be returned if the
	* argument is an empty string or is equal to this
	* <code>String</code> object as determined by the
	* {@link #equals(Object)} method.
	* @exception java.lang.NullPointerException if <code>prefix</code> is
	* <code>null</code>.
	* @since JDK1. 0
	*/
	public boolean startsWith(XMLString prefix)
	{
	return startsWith(prefix, 0);
	}

	/**
	* Returns the index within this string of the first occurrence of the
	* specified character. If a character with value <code>ch</code> occurs
	* in the character sequence represented by this <code>String</code>
	* object, then the index of the first such occurrence is returned --
	* that is, the smallest value <i>k</i> such that:
	* <blockquote><pre>
	* this.charAt(<i>k</i>) == ch
	* </pre></blockquote>
	* is <code>true</code>. If no such character occurs in this string,
	* then <code>-1</code> is returned.
	*
	* @param ch a character.
	* @return the index of the first occurrence of the character in the
	* character sequence represented by this object, or
	* <code>-1</code> if the character does not occur.
	*/
	public int indexOf(int ch)
	{
	return indexOf(ch, 0);
	}

	/**
	* Returns the index within this string of the first occurrence of the
	* specified character, starting the search at the specified index.
	* <p>
	* If a character with value <code>ch</code> occurs in the character
	* sequence represented by this <code>String</code> object at an index
	* no smaller than <code>fromIndex</code>, then the index of the first
	* such occurrence is returned--that is, the smallest value <i>k</i>
	* such that:
	* <blockquote><pre>
	* (this.charAt(<i>k</i>) == ch) && (<i>k</i> >= fromIndex)
	* </pre></blockquote>
	* is true. If no such character occurs in this string at or after
	* position <code>fromIndex</code>, then <code>-1</code> is returned.
	* <p>
	* There is no restriction on the value of <code>fromIndex</code>. If it
	* is negative, it has the same effect as if it were zero: this entire
	* string may be searched. If it is greater than the length of this
	* string, it has the same effect as if it were equal to the length of
	* this string: <code>-1</code> is returned.
	*
	* @param ch a character.
	* @param fromIndex the index to start the search from.
	* @return the index of the first occurrence of the character in the
	* character sequence represented by this object that is greater
	* than or equal to <code>fromIndex</code>, or <code>-1</code>
	* if the character does not occur.
	*/
	public int indexOf(int ch, int fromIndex)
	{

	int max = m_start + m_length;
	FastStringBuffer fsb = fsb();

	if (fromIndex < 0)
	{
	fromIndex = 0;
	}
	else if (fromIndex >= m_length)
	{

	// Note: fromIndex might be near -1>>>1.
	return -1;
	}

	for (int i = m_start + fromIndex; i < max; i++)
	{
	if (fsb.charAt(i) == ch)
	{
	return i - m_start;
	}
	}

	return -1;
	}

	/**
	* Returns a new string that is a substring of this string. The
	* substring begins with the character at the specified index and
	* extends to the end of this string. <p>
	* Examples:
	* <blockquote><pre>
	* "unhappy".substring(2) returns "happy"
	* "Harbison".substring(3) returns "bison"
	* "emptiness".substring(9) returns "" (an empty string)
	* </pre></blockquote>
	*
	* @param beginIndex the beginning index, inclusive.
	* @return the specified substring.
	* @exception IndexOutOfBoundsException if
	* <code>beginIndex</code> is negative or larger than the
	* length of this <code>String</code> object.
	*/
	public XMLString substring(int beginIndex)
	{

	int len = m_length - beginIndex;

	if (len <= 0)
	return XString.EMPTYSTRING;
	else
	{
	int start = m_start + beginIndex;

	return new XStringForFSB(fsb(), start, len);
	}
	}

	/**
	* Returns a new string that is a substring of this string. The
	* substring begins at the specified <code>beginIndex</code> and
	* extends to the character at index <code>endIndex - 1</code>.
	* Thus the length of the substring is <code>endIndex-beginIndex</code>.
	*
	* @param beginIndex the beginning index, inclusive.
	* @param endIndex the ending index, exclusive.
	* @return the specified substring.
	* @exception IndexOutOfBoundsException if the
	* <code>beginIndex</code> is negative, or
	* <code>endIndex</code> is larger than the length of
	* this <code>String</code> object, or
	* <code>beginIndex</code> is larger than
	* <code>endIndex</code>.
	*/
	public XMLString substring(int beginIndex, int endIndex)
	{

	int len = endIndex - beginIndex;

	if (len > m_length)
	len = m_length;

	if (len <= 0)
	return XString.EMPTYSTRING;
	else
	{
	int start = m_start + beginIndex;

	return new XStringForFSB(fsb(), start, len);
	}
	}

	/**
	* Concatenates the specified string to the end of this string.
	*
	* @param str the <code>String</code> that is concatenated to the end
	* of this <code>String</code>.
	* @return a string that represents the concatenation of this object's
	* characters followed by the string argument's characters.
	* @exception java.lang.NullPointerException if <code>str</code> is
	* <code>null</code>.
	*/
	public XMLString concat(String str)
	{

	// %OPT% Make an FSB here?
	return new XString(str().concat(str));
	}

	/**
	* Removes white space from both ends of this string.
	*
	* @return this string, with white space removed from the front and end.
	*/
	public XMLString trim()
	{
	return fixWhiteSpace(true, true, false);
	}

	/**
	* Returns whether the specified <var>ch</var> conforms to the XML 1.0 definition
	* of whitespace. Refer to <A href="http://www.w3.org/TR/1998/REC-xml-19980210#NT-S">
	* the definition of <CODE>S</CODE></A> for details.
	* @param ch Character to check as XML whitespace.
	* @return =true if <var>ch</var> is XML whitespace; otherwise =false.
	*/
	private static boolean isSpace(char ch)
	{
	return XMLCharacterRecognizer.isWhiteSpace(ch); // Take the easy way out for now.
	}

	/**
	* Conditionally trim all leading and trailing whitespace in the specified String.
	* All strings of white space are
	* replaced by a single space character (#x20), except spaces after punctuation which
	* receive double spaces if doublePunctuationSpaces is true.
	* This function may be useful to a formatter, but to get first class
	* results, the formatter should probably do it's own white space handling
	* based on the semantics of the formatting object.
	*
	* @param trimHead Trim leading whitespace?
	* @param trimTail Trim trailing whitespace?
	* @param doublePunctuationSpaces Use double spaces for punctuation?
	* @return The trimmed string.
	*/
	public XMLString fixWhiteSpace(boolean trimHead, boolean trimTail,
	boolean doublePunctuationSpaces)
	{

	int end = m_length + m_start;
	char[] buf = new char[m_length];
	FastStringBuffer fsb = fsb();
	boolean edit = false;

	/* replace S to ' '. and ' '+ -> single ' '. */
	int d = 0;
	boolean pres = false;

	for (int s = m_start; s < end; s++)
	{
	char c = fsb.charAt(s);

	if (isSpace(c))
	{
	if (!pres)
	{
	if (' ' != c)
	{
	edit = true;
	}

	buf[d++] = ' ';

	if (doublePunctuationSpaces && (d != 0))
	{
	char prevChar = buf[d - 1];

	if (!((prevChar == '.') \|\| (prevChar == '!')
	\|\| (prevChar == '?')))
	{
	pres = true;
	}
	}
	else
	{
	pres = true;
	}
	}
	else
	{
	edit = true;
	pres = true;
	}
	}
	else
	{
	buf[d++] = c;
	pres = false;
	}
	}

	if (trimTail && 1 <= d && ' ' == buf[d - 1])
	{
	edit = true;

	d--;
	}

	int start = 0;

	if (trimHead && 0 < d && ' ' == buf[0])
	{
	edit = true;

	start++;
	}

	XMLStringFactory xsf = XMLStringFactoryImpl.getFactory();

	return edit ? xsf.newstr(buf, start, d - start) : this;
	}

	/**
	* Convert a string to a double -- Allowed input is in fixed
	* notation ddd.fff.
	*
	* %OPT% CHECK PERFORMANCE against generating a Java String and
	* converting it to double. The advantage of running in native
	* machine code -- perhaps even microcode, on some systems -- may
	* more than make up for the cost of allocating and discarding the
	* additional object. We need to benchmark this.
	*
	* %OPT% More importantly, we need to decide whether we _care_ about
	* the performance of this operation. Does XString.toDouble constitute
	* any measurable percentage of our typical runtime? I suspect not!
	*
	* @return A double value representation of the string, or return Double.NaN
	* if the string can not be converted. */
	public double toDouble()
	{
	if(m_length == 0)
	return Double.NaN;
	int i;
	char c;
	String valueString = fsb().getString(m_start,m_length);

	// The following are permitted in the Double.valueOf, but not by the XPath spec:
	// - a plus sign
	// - The use of e or E to indicate exponents
	// - trailing f, F, d, or D
	// See function comments; not sure if this is slower than actually doing the
	// conversion ourselves (as was before).

	for (i=0;i<m_length;i++)
	if (!XMLCharacterRecognizer.isWhiteSpace(valueString.charAt(i)))
	break;
	if (i == m_length) return Double.NaN;
	if (valueString.charAt(i) == '-')
	i++;
	for (;i<m_length;i++) {
	c = valueString.charAt(i);
	if (c != '.' && (c < '0' \|\| c > '9'))
	break;
	}
	for (;i<m_length;i++)
	if (!XMLCharacterRecognizer.isWhiteSpace(valueString.charAt(i)))
	break;
	if (i != m_length)
	return Double.NaN;

	try {
	return Double.parseDouble(valueString);
	} catch (NumberFormatException nfe) {
	// This should catch double periods, empty strings.
	return Double.NaN;
	}
	}
	}

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