org.apache.xpath.objects.XString Maven / Gradle / Ivy
/*
* 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.
*/
/*
* $Id: XString.java 570108 2007-08-27 13:30:57Z zongaro $
*/
package org.apache.xpath.objects;
import java.util.Locale;
import org.apache.xml.dtm.DTM;
import org.apache.xml.utils.XMLCharacterRecognizer;
import org.apache.xml.utils.XMLString;
import org.apache.xml.utils.XMLStringFactory;
import org.apache.xpath.ExpressionOwner;
import org.apache.xpath.XPathContext;
import org.apache.xpath.XPathVisitor;
/**
* This class represents an XPath string object, and is capable of
* converting the string to other types, such as a number.
* @xsl.usage general
*/
public class XString extends XObject implements XMLString
{
static final long serialVersionUID = 2020470518395094525L;
/** Empty string XString object */
public static final XString EMPTYSTRING = new XString("");
/**
* Construct a XString object. This constructor exists for derived classes.
*
* @param val String object this will wrap.
*/
protected XString(Object val)
{
super(val);
}
/**
* Construct a XNodeSet object.
*
* @param val String object this will wrap.
*/
public XString(String val)
{
super(val);
}
/**
* Tell that this is a CLASS_STRING.
*
* @return type CLASS_STRING
*/
public int getType()
{
return CLASS_STRING;
}
/**
* Given a request type, return the equivalent string.
* For diagnostic purposes.
*
* @return type string "#STRING"
*/
public String getTypeString()
{
return "#STRING";
}
/**
* 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 true;
}
/**
* Cast result object to a number.
*
* @return 0.0 if this string is null, numeric value of this string
* or NaN
*/
public double num()
{
return toDouble();
}
/**
* Convert a string to a double -- Allowed input is in fixed
* notation ddd.fff.
*
* @return A double value representation of the string, or return Double.NaN
* if the string can not be converted.
*/
public double toDouble()
{
/* XMLCharacterRecognizer.isWhiteSpace(char c) methods treats the following
* characters as white space characters.
* ht - horizontal tab, nl - newline , cr - carriage return and sp - space
* trim() methods by default also takes care of these white space characters
* So trim() method is used to remove leading and trailing white spaces.
*/
XMLString s = trim();
double result = Double.NaN;
for (int i = 0; i < s.length(); i++)
{
char c = s.charAt(i);
if (c != '-' && c != '.' && ( c < 0X30 || c > 0x39)) {
// The character is not a '-' or a '.' or a digit
// then return NaN because something is wrong.
return result;
}
}
try
{
result = Double.parseDouble(s.toString());
} catch (NumberFormatException e){}
return result;
}
/**
* Cast result object to a boolean.
*
* @return True if the length of this string object is greater
* than 0.
*/
public boolean bool()
{
return str().length() > 0;
}
/**
* Cast result object to a string.
*
* @return The string this wraps or the empty string if null
*/
public XMLString xstr()
{
return this;
}
/**
* Cast result object to a string.
*
* @return The string this wraps or the empty string if null
*/
public String str()
{
return (null != m_obj) ? ((String) m_obj) : "";
}
/**
* Cast result object to a result tree fragment.
*
* @param support Xpath context to use for the conversion
*
* @return A document fragment with this string as a child node
*/
public int rtf(XPathContext support)
{
DTM frag = support.createDocumentFragment();
frag.appendTextChild(str());
return frag.getDocument();
}
/**
* 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
{
String str = str();
ch.characters(str.toCharArray(), 0, str.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
{
String str = str();
lh.comment(str.toCharArray(), 0, str.length());
}
/**
* Returns the length of this string.
*
* @return the length of the sequence of characters represented by this
* object.
*/
public int length()
{
return str().length();
}
/**
* Returns the character at the specified index. An index ranges
* from 0 to length() - 1. The first character
* of the sequence is at index 0, the next at index
* 1, 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 0.
* @exception IndexOutOfBoundsException if the index
* argument is negative or not less than the length of this
* string.
*/
public char charAt(int index)
{
return str().charAt(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:
* srcBegin is negative.
* srcBegin is greater than srcEnd
* srcEnd is greater than the length of this
* string
* dstBegin is negative
* dstBegin+(srcEnd-srcBegin) is larger than
* dst.length
* @exception NullPointerException if dst is null
*/
public void getChars(int srcBegin, int srcEnd, char dst[], int dstBegin)
{
str().getChars(srcBegin, srcEnd, dst, dstBegin);
}
/**
* 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)
{
// In order to handle the 'all' semantics of
// nodeset comparisons, we always call the
// nodeset function.
int t = obj2.getType();
try
{
if (XObject.CLASS_NODESET == t)
return obj2.equals(this);
// If at least one object to be compared is a boolean, then each object
// to be compared is converted to a boolean as if by applying the
// boolean function.
else if(XObject.CLASS_BOOLEAN == t)
return obj2.bool() == bool();
// Otherwise, if at least one object to be compared is a number, then each object
// to be compared is converted to a number as if by applying the number function.
else if(XObject.CLASS_NUMBER == t)
return obj2.num() == num();
}
catch(javax.xml.transform.TransformerException te)
{
throw new org.apache.xml.utils.WrappedRuntimeException(te);
}
// Otherwise, both objects to be compared are converted to strings as
// if by applying the string function.
return xstr().equals(obj2.xstr());
}
/**
* Compares this string to the specified String.
* The result is true if and only if the argument is not
* null and is a String object that represents
* the same sequence of characters as this object.
*
* @param obj2 the object to compare this String against.
* @return true if the Strings are equal;
* false otherwise.
* @see java.lang.String#compareTo(java.lang.String)
* @see java.lang.String#equalsIgnoreCase(java.lang.String)
*/
public boolean equals(String obj2) {
return str().equals(obj2);
}
/**
* Compares this string to the specified object.
* The result is true if and only if the argument is not
* null and is a String object that represents
* the same sequence of characters as this object.
*
* @param obj2 the object to compare this String
* against.
* @return true if the String are equal;
* false otherwise.
* @see java.lang.String#compareTo(java.lang.String)
* @see java.lang.String#equalsIgnoreCase(java.lang.String)
*/
public boolean equals(XMLString obj2)
{
if (obj2 != null) {
if (!obj2.hasString()) {
return obj2.equals(str());
} else {
return str().equals(obj2.toString());
}
}
return false;
}
/**
* Compares this string to the specified object.
* The result is true if and only if the argument is not
* null and is a String object that represents
* the same sequence of characters as this object.
*
* @param obj2 the object to compare this String
* against.
* @return true if the String are equal;
* false 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;
// 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 XNumber)
return obj2.equals(this);
else
return str().equals(obj2.toString());
}
/**
* Compares this String to another String,
* 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 String to compare this
* String against.
* @return true if the argument is not null
* and the Strings are equal,
* ignoring case; false otherwise.
* @see #equals(Object)
* @see java.lang.Character#toLowerCase(char)
* @see java.lang.Character#toUpperCase(char)
*/
public boolean equalsIgnoreCase(String anotherString)
{
return str().equalsIgnoreCase(anotherString);
}
/**
* Compares two strings lexicographically.
*
* @param xstr the String to be compared.
*
* @return the value 0 if the argument string is equal to
* this string; a value less than 0 if this string
* is lexicographically less than the string argument; and a
* value greater than 0 if this string is
* lexicographically greater than the string argument.
* @exception java.lang.NullPointerException if anotherString
* is null.
*/
public int compareTo(XMLString xstr)
{
int len1 = this.length();
int len2 = xstr.length();
int n = Math.min(len1, len2);
int i = 0;
int j = 0;
while (n-- != 0)
{
char c1 = this.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
* this.toUpperCase().toLowerCase().compareTo(
* str.toUpperCase().toLowerCase()).
*
* Note that this method does not take locale into account,
* and will result in an unsatisfactory ordering for certain locales.
* The java.text package provides collators to allow
* locale-sensitive ordering.
*
* @param str the String 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 str)
{
// %REVIEW% Like it says, @since 1.2. Doesn't exist in earlier
// versions of Java, hence we can't yet shell out to it. We can implement
// it as character-by-character compare, but doing so efficiently
// is likely to be (ahem) interesting.
//
// However, since nobody is actually _using_ this method yet:
// return str().compareToIgnoreCase(str.toString());
throw new org.apache.xml.utils.WrappedRuntimeException(
new java.lang.NoSuchMethodException(
"Java 1.2 method, not yet implemented"));
}
/**
* 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 true if the character sequence represented by the
* argument is a prefix of the substring of this object starting
* at index toffset; false otherwise.
* The result is false if toffset is
* negative or greater than the length of this
* String object; otherwise the result is the same
* as the result of the expression
*
* this.subString(toffset).startsWith(prefix)
*
* @exception java.lang.NullPointerException if prefix is
* null.
*/
public boolean startsWith(String prefix, int toffset)
{
return str().startsWith(prefix, toffset);
}
/**
* Tests if this string starts with the specified prefix.
*
* @param prefix the prefix.
* @return true if the character sequence represented by the
* argument is a prefix of the character sequence represented by
* this string; false otherwise.
* Note also that true will be returned if the
* argument is an empty string or is equal to this
* String object as determined by the
* {@link #equals(Object)} method.
* @exception java.lang.NullPointerException if prefix is
* null.
*/
public boolean startsWith(String prefix)
{
return startsWith(prefix, 0);
}
/**
* 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 true if the character sequence represented by the
* argument is a prefix of the substring of this object starting
* at index toffset; false otherwise.
* The result is false if toffset is
* negative or greater than the length of this
* String object; otherwise the result is the same
* as the result of the expression
*
* this.subString(toffset).startsWith(prefix)
*
* @exception java.lang.NullPointerException if prefix is
* null.
*/
public boolean startsWith(XMLString prefix, int toffset)
{
int to = toffset;
int tlim = this.length();
int po = 0;
int pc = prefix.length();
// Note: toffset might be near -1>>>1.
if ((toffset < 0) || (toffset > tlim - pc))
{
return false;
}
while (--pc >= 0)
{
if (this.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 true if the character sequence represented by the
* argument is a prefix of the character sequence represented by
* this string; false otherwise.
* Note also that true will be returned if the
* argument is an empty string or is equal to this
* String object as determined by the
* {@link #equals(Object)} method.
* @exception java.lang.NullPointerException if prefix is
* null.
*/
public boolean startsWith(XMLString prefix)
{
return startsWith(prefix, 0);
}
/**
* Tests if this string ends with the specified suffix.
*
* @param suffix the suffix.
* @return true if the character sequence represented by the
* argument is a suffix of the character sequence represented by
* this object; false otherwise. Note that the
* result will be true if the argument is the
* empty string or is equal to this String object
* as determined by the {@link #equals(Object)} method.
* @exception java.lang.NullPointerException if suffix is
* null.
*/
public boolean endsWith(String suffix)
{
return str().endsWith(suffix);
}
/**
* Returns a hashcode for this string. The hashcode for a
* String object is computed as
*
* s[0]*31^(n-1) + s[1]*31^(n-2) + ... + s[n-1]
*
* using int arithmetic, where s[i] is the
* ith character of the string, n is the length of
* the string, and ^ indicates exponentiation.
* (The hash value of the empty string is zero.)
*
* @return a hash code value for this object.
*/
public int hashCode()
{
return str().hashCode();
}
/**
* Returns the index within this string of the first occurrence of the
* specified character. If a character with value ch occurs
* in the character sequence represented by this String
* object, then the index of the first such occurrence is returned --
* that is, the smallest value k such that:
*
* this.charAt(k) == ch
*
* is true. If no such character occurs in this string,
* then -1 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
* -1 if the character does not occur.
*/
public int indexOf(int ch)
{
return str().indexOf(ch);
}
/**
* Returns the index within this string of the first occurrence of the
* specified character, starting the search at the specified index.
*
* If a character with value ch occurs in the character
* sequence represented by this String object at an index
* no smaller than fromIndex, then the index of the first
* such occurrence is returned--that is, the smallest value k
* such that:
*
* (this.charAt(k) == ch) && (k >= fromIndex)
*
* is true. If no such character occurs in this string at or after
* position fromIndex, then -1 is returned.
*
* There is no restriction on the value of fromIndex. 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: -1 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 fromIndex, or -1
* if the character does not occur.
*/
public int indexOf(int ch, int fromIndex)
{
return str().indexOf(ch, fromIndex);
}
/**
* Returns the index within this string of the last occurrence of the
* specified character. That is, the index returned is the largest
* value k such that:
*
* this.charAt(k) == ch
*
* is true.
* The String is searched backwards starting at the last character.
*
* @param ch a character.
* @return the index of the last occurrence of the character in the
* character sequence represented by this object, or
* -1 if the character does not occur.
*/
public int lastIndexOf(int ch)
{
return str().lastIndexOf(ch);
}
/**
* Returns the index within this string of the last occurrence of the
* specified character, searching backward starting at the specified
* index. That is, the index returned is the largest value k
* such that:
*
* this.charAt(k) == ch) && (k <= fromIndex)
*
* is true.
*
* @param ch a character.
* @param fromIndex the index to start the search from. There is no
* restriction on the value of fromIndex. If it is
* greater than or equal to the length of this string, it has
* the same effect as if it were equal to one less than the
* length of this string: this entire string may be searched.
* If it is negative, it has the same effect as if it were -1:
* -1 is returned.
* @return the index of the last occurrence of the character in the
* character sequence represented by this object that is less
* than or equal to fromIndex, or -1
* if the character does not occur before that point.
*/
public int lastIndexOf(int ch, int fromIndex)
{
return str().lastIndexOf(ch, fromIndex);
}
/**
* Returns the index within this string of the first occurrence of the
* specified substring. The integer returned is the smallest value
* k such that:
*
* this.startsWith(str, k)
*
* is true.
*
* @param str any string.
* @return if the string argument occurs as a substring within this
* object, then the index of the first character of the first
* such substring is returned; if it does not occur as a
* substring, -1 is returned.
* @exception java.lang.NullPointerException if str is
* null.
*/
public int indexOf(String str)
{
return str().indexOf(str);
}
/**
* Returns the index within this string of the first occurrence of the
* specified substring. The integer returned is the smallest value
* k such that:
*
* this.startsWith(str, k)
*
* is true.
*
* @param str any string.
* @return if the string argument occurs as a substring within this
* object, then the index of the first character of the first
* such substring is returned; if it does not occur as a
* substring, -1 is returned.
* @exception java.lang.NullPointerException if str is
* null.
*/
public int indexOf(XMLString str)
{
return str().indexOf(str.toString());
}
/**
* Returns the index within this string of the first occurrence of the
* specified substring, starting at the specified index. The integer
* returned is the smallest value k such that:
*
* this.startsWith(str, k) && (k >= fromIndex)
*
* is true.
*
* There is no restriction on the value of fromIndex. 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: -1 is returned.
*
* @param str the substring to search for.
* @param fromIndex the index to start the search from.
* @return If the string argument occurs as a substring within this
* object at a starting index no smaller than
* fromIndex, then the index of the first character
* of the first such substring is returned. If it does not occur
* as a substring starting at fromIndex or beyond,
* -1 is returned.
* @exception java.lang.NullPointerException if str is
* null
*/
public int indexOf(String str, int fromIndex)
{
return str().indexOf(str, fromIndex);
}
/**
* Returns the index within this string of the rightmost occurrence
* of the specified substring. The rightmost empty string "" is
* considered to occur at the index value this.length().
* The returned index is the largest value k such that
*
* this.startsWith(str, k)
*
* is true.
*
* @param str the substring to search for.
* @return if the string argument occurs one or more times as a substring
* within this object, then the index of the first character of
* the last such substring is returned. If it does not occur as
* a substring, -1 is returned.
* @exception java.lang.NullPointerException if str is
* null.
*/
public int lastIndexOf(String str)
{
return str().lastIndexOf(str);
}
/**
* Returns the index within this string of the last occurrence of
* the specified substring.
*
* @param str the substring to search for.
* @param fromIndex the index to start the search from. There is no
* restriction on the value of fromIndex. 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: this entire string
* may be searched. If it is negative, it has the same effect
* as if it were -1: -1 is returned.
* @return If the string argument occurs one or more times as a substring
* within this object at a starting index no greater than
* fromIndex, then the index of the first character of
* the last such substring is returned. If it does not occur as a
* substring starting at fromIndex or earlier,
* -1 is returned.
* @exception java.lang.NullPointerException if str is
* null.
*/
public int lastIndexOf(String str, int fromIndex)
{
return str().lastIndexOf(str, fromIndex);
}
/**
* 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.
* Examples:
*
* "unhappy".substring(2) returns "happy"
* "Harbison".substring(3) returns "bison"
* "emptiness".substring(9) returns "" (an empty string)
*
*
* @param beginIndex the beginning index, inclusive.
* @return the specified substring.
* @exception IndexOutOfBoundsException if
* beginIndex is negative or larger than the
* length of this String object.
*/
public XMLString substring(int beginIndex)
{
return new XString(str().substring(beginIndex));
}
/**
* Returns a new string that is a substring of this string. The
* substring begins at the specified beginIndex and
* extends to the character at index endIndex - 1.
* Thus the length of the substring is endIndex-beginIndex.
*
* @param beginIndex the beginning index, inclusive.
* @param endIndex the ending index, exclusive.
* @return the specified substring.
* @exception IndexOutOfBoundsException if the
* beginIndex is negative, or
* endIndex is larger than the length of
* this String object, or
* beginIndex is larger than
* endIndex.
*/
public XMLString substring(int beginIndex, int endIndex)
{
return new XString(str().substring(beginIndex, endIndex));
}
/**
* Concatenates the specified string to the end of this string.
*
* @param str the String that is concatenated to the end
* of this String.
* @return a string that represents the concatenation of this object's
* characters followed by the string argument's characters.
* @exception java.lang.NullPointerException if str is
* null.
*/
public XMLString concat(String str)
{
// %REVIEW% Make an FSB here?
return new XString(str().concat(str));
}
/**
* Converts all of the characters in this String to lower
* case using the rules of the given Locale.
*
* @param locale use the case transformation rules for this locale
* @return the String, converted to lowercase.
* @see java.lang.Character#toLowerCase(char)
* @see java.lang.String#toUpperCase(Locale)
*/
public XMLString toLowerCase(Locale locale)
{
return new XString(str().toLowerCase(locale));
}
/**
* Converts all of the characters in this String to lower
* case using the rules of the default locale, which is returned
* by Locale.getDefault.
*
*
* @return the string, converted to lowercase.
* @see java.lang.Character#toLowerCase(char)
* @see java.lang.String#toLowerCase(Locale)
*/
public XMLString toLowerCase()
{
return new XString(str().toLowerCase());
}
/**
* Converts all of the characters in this String to upper
* case using the rules of the given locale.
* @param locale use the case transformation rules for this locale
* @return the String, converted to uppercase.
* @see java.lang.Character#toUpperCase(char)
* @see java.lang.String#toLowerCase(Locale)
*/
public XMLString toUpperCase(Locale locale)
{
return new XString(str().toUpperCase(locale));
}
/**
* Converts all of the characters in this String to upper
* case using the rules of the default locale, which is returned
* by Locale.getDefault.
*
*
* If no character in this string has a different uppercase version,
* based on calling the toUpperCase method defined by
* Character, then the original string is returned.
*
* Otherwise, this method creates a new String object
* representing a character sequence identical in length to the
* character sequence represented by this String object and
* with every character equal to the result of applying the method
* Character.toUpperCase to the corresponding character of
* this String object.
* Examples:
*
* "Fahrvergnügen".toUpperCase() returns "FAHRVERGNÜGEN"
* "Visit Ljubinje!".toUpperCase() returns "VISIT LJUBINJE!"
*
*
* @return the string, converted to uppercase.
* @see java.lang.Character#toUpperCase(char)
* @see java.lang.String#toUpperCase(Locale)
*/
public XMLString toUpperCase()
{
return new XString(str().toUpperCase());
}
/**
* 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 new XString(str().trim());
}
/**
* Returns whether the specified ch conforms to the XML 1.0 definition
* of whitespace. Refer to
* the definition of S for details.
* @param ch Character to check as XML whitespace.
* @return =true if ch 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)
{
// %OPT% !!!!!!!
int len = this.length();
char[] buf = new char[len];
this.getChars(0, len, buf, 0);
boolean edit = false;
int s;
for (s = 0; s < len; s++)
{
if (isSpace(buf[s]))
{
break;
}
}
/* replace S to ' '. and ' '+ -> single ' '. */
int d = s;
boolean pres = false;
for (; s < len; s++)
{
char c = buf[s];
if (isSpace(c))
{
if (!pres)
{
if (' ' != c)
{
edit = true;
}
buf[d++] = ' ';
if (doublePunctuationSpaces && (s != 0))
{
char prevChar = buf[s - 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(new String(buf, start, d - start)) : this;
}
/**
* @see org.apache.xpath.XPathVisitable#callVisitors(ExpressionOwner, XPathVisitor)
*/
public void callVisitors(ExpressionOwner owner, XPathVisitor visitor)
{
visitor.visitStringLiteral(owner, this);
}
}