/java-1.7.0-openjdk/openjdk/jaxp/src/com/sun/org/apache/xpath/internal/objects/XStringForFSB.java
Java | 988 lines | 402 code | 122 blank | 464 comment | 101 complexity | 781da2e08e1dc35773eaad0f723a6016 MD5 | raw file
Possible License(s): GPL-2.0, BSD-3-Clause-No-Nuclear-License-2014, LGPL-3.0, LGPL-2.0
- /*
- * reserved comment block
- * DO NOT REMOVE OR ALTER!
- */
- /*
- * Copyright 1999-2004 The Apache Software Foundation.
- *
- * Licensed 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.
- */
- /*
- * $Id: XStringForFSB.java,v 1.2.4.2 2005/09/14 20:46:27 jeffsuttor Exp $
- */
- 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;
- }
- }
- }