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/*
* Javolution - Java(TM) Solution for Real-Time and Embedded Systems
* Copyright (C) 2012 - Javolution (http://javolution.org/)
* All rights reserved.
*
* Permission to use, copy, modify, and distribute this software is
* freely granted, provided that this notice is preserved.
*/
package javolution.text;
import java.io.PrintStream;
import javolution.lang.MathLib;
import javolution.lang.Realtime;
import javolution.lang.ValueType;
import javolution.util.FastMap;
import javolution.util.function.Equalities;
import javolution.xml.XMLSerializable;
/**
* An immutable character sequence with fast {@link #concat concatenation},
* {@link #insert insertion} and
* {@link #delete deletion} capabilities (O[Log(n)]) instead of
* O[n] for StringBuffer/StringBuilder).
* This class has the same methods as
*
* Java String and
*
* .NET String with the following benefits:
* - No need for an intermediate
* {@link StringBuffer}/{@link StringBuilder} in order to manipulate
* textual documents (insertion, deletion or concatenation).
* - Bug free. They are not plagued by the {@link String#substring}
* memory leak bug (when small substrings prevent memory from
* larger string from being garbage collected).
* - More flexible as they allows for search and comparison with any
*
java.lang.String or CharSequence.
*
* {@link Text} literals should be explicitly {@link #intern interned}.
* Unlike strings literals and strings-value constant expressions,
* interning is not implicit. For example:[code]
* final static Text TRUE = new Text("true").intern();
* final static Text FALSE = new Text("true").intern("false");
* [/code]
*
* Implementation Note: To avoid expensive copy operations ,
* {@link Text} instances are broken down into smaller immutable
* sequences, they form a minimal-depth binary tree.
* The tree is maintained balanced automatically through tree rotations.
* Insertion/deletions are performed in O[Log(n)]
* instead of O[n] for
* StringBuffer/StringBuilder.
*
* @author Jean-Marie Dautelle
* @author Wilfried Middleton
* @version 6.0, July 21, 2013
*/
@Realtime
public final class Text implements CharSequence, Comparable,
XMLSerializable, ValueType {
private static final long serialVersionUID = 0x600L; // Version.
/**
* Holds the default size for primitive blocks of characters.
*/
private static final int BLOCK_SIZE = 1 << 5;
/**
* Holds the mask used to ensure a block boundary cesures.
*/
private static final int BLOCK_MASK = ~(BLOCK_SIZE - 1);
/**
* Holds the texts interned in immortal memory.
*/
private static final FastMap INTERN = new FastMap()
.shared();
/**
* Holds an empty character sequence.
*/
public static final Text EMPTY = new Text("").intern();
/**
* Holds the raw data (primitive) or null (composite).
*/
private final char[] _data;
/**
* Holds the total number of characters.
*/
private int _count;
/**
* Holds the head block of character (composite).
*/
private Text _head;
/**
* Holds the tail block of character (composite).
*/
private Text _tail;
/**
* Creates a new text instance.
*
* @param isPrimitive indicates if primitive or composite.
*/
private Text(boolean isPrimitive) {
_data = isPrimitive ? new char[BLOCK_SIZE] : null;
}
/**
* Creates a text holding the characters from the specified String
* .
*
* @param str the string holding the character content.
*/
public Text(String str) {
this(str.length() <= BLOCK_SIZE);
_count = str.length();
if (_data != null) { // Primitive.
str.getChars(0, _count, _data, 0);
} else { // Composite, splits on a block boundary.
int half = ((_count + BLOCK_SIZE) >> 1) & BLOCK_MASK;
_head = new Text(str.substring(0, half));
_tail = new Text(str.substring(half, _count));
}
}
/**
* Returns the text representing the specified object.
*
* @param obj the object to represent as text.
* @return {@code new TextBuilder().append(obj).toText()}
*/
public static Text valueOf(Object obj) {
return new TextBuilder().append(obj).toText();
}
private static Text valueOf(String str) {
return Text.valueOf(str, 0, str.length());
}
private static Text valueOf(String str, int start, int end) {
int length = end - start;
if (length <= BLOCK_SIZE) {
Text text = newPrimitive(length);
str.getChars(start, end, text._data, 0);
return text;
} else { // Splits on a block boundary.
int half = ((length + BLOCK_SIZE) >> 1) & BLOCK_MASK;
return newComposite(Text.valueOf(str, start, start + half),
Text.valueOf(str, start + half, end));
}
}
/**
* Returns the text that contains the characters from the specified
* array.
*
* @param chars the array source of the characters.
* @return the corresponding instance.
*/
public static Text valueOf(char[] chars) {
return Text.valueOf(chars, 0, chars.length);
}
/**
* Returns the text that contains the characters from the specified
* subarray of characters.
*
* @param chars the source of the characters.
* @param offset the index of the first character in the data soure.
* @param length the length of the text returned.
* @return the corresponding instance.
* @throws IndexOutOfBoundsException if (offset < 0) ||
* (length < 0) || ((offset + length) > chars.length)
*/
public static Text valueOf(char[] chars, int offset, int length) {
if ((offset < 0) || (length < 0) || ((offset + length) > chars.length))
throw new IndexOutOfBoundsException();
if (length <= BLOCK_SIZE) {
Text text = Text.newPrimitive(length);
System.arraycopy(chars, offset, text._data, 0, length);
return text;
} else { // Splits on a block boundary.
int half = ((length + BLOCK_SIZE) >> 1) & BLOCK_MASK;
return Text.newComposite(Text.valueOf(chars, offset, half),
Text.valueOf(chars, offset + half, length - half));
}
}
/**
* Converts a text builder to a text instance (optimization for
* TextBuilder.toText()).
*
* @param start the index of the first character inclusive.
* @param end the index of the last character exclusive.
* @return the corresponding text instance.
*/
static Text valueOf(TextBuilder tb, int start, int end) {
int length = end - start;
if (length <= BLOCK_SIZE) {
Text text = Text.newPrimitive(length);
tb.getChars(start, end, text._data, 0);
return text;
} else { // Splits on a block boundary.
int half = ((length + BLOCK_SIZE) >> 1) & BLOCK_MASK;
return Text.newComposite(Text.valueOf(tb, start, start + half),
Text.valueOf(tb, start + half, end));
}
}
/**
* Returns the text representation of the boolean argument.
*
* @param b a boolean.
* @return if the argument is true, the text
* "true" is returned; otherwise, the text
* "false" is returned.
*/
public static Text valueOf(boolean b) {
return b ? TRUE : FALSE;
}
private static final Text TRUE = new Text("true").intern();
private static final Text FALSE = new Text("false").intern();
/**
* Returns the text instance corresponding to the specified character.
*
* @param c a character.
* @return a text of length 1 containing 'c'.
*/
public static Text valueOf(char c) {
Text text = Text.newPrimitive(1);
text._data[0] = c;
return text;
}
/**
* Returns the decimal representation of the specified int
* argument.
*
* @param i the int to format.
* @return the corresponding text instance.
*/
public static Text valueOf(int i) {
TextBuilder tb = new TextBuilder();
return tb.append(i).toText();
}
/**
* Returns the radix representation of the specified int
* argument.
*
* @param i the int to format.
* @param radix the radix (e.g. 16 for hexadecimal).
* @return the corresponding text instance.
*/
public static Text valueOf(int i, int radix) {
TextBuilder tb = new TextBuilder();
return tb.append(i, radix).toText();
}
/**
* Returns the decimal representation of the specified long
* argument.
*
* @param l the long to format.
* @return the corresponding text instance.
*/
public static Text valueOf(long l) {
TextBuilder tb = new TextBuilder();
return tb.append(l).toText();
}
/**
* Returns the radix representation of the specified long
* argument.
*
* @param l the long to format.
* @param radix the radix (e.g. 16 for hexadecimal).
* @return the corresponding text instance.
*/
public static Text valueOf(long l, int radix) {
TextBuilder tb = new TextBuilder();
return tb.append(l, radix).toText();
}
/**
* Returns the textual representation of the specified float
* instance.
*
* @param f the float to format.
* @return the corresponding text instance.
*/
public static Text valueOf(float f) {
TextBuilder tb = new TextBuilder();
return tb.append(f).toText();
}
/**
* Returns the textual representation of the specified double
* argument.
*
* @param d the double to format.
* @return the corresponding text instance.
*/
public static Text valueOf(double d) {
TextBuilder tb = new TextBuilder();
return tb.append(d).toText();
}
/**
* Returns the textual representation of the specified double
* argument formatted as specified.
*
* @param d the double to format.
* @param digits the number of significative digits (excludes exponent) or
* -1 to mimic the standard library (16 or 17 digits).
* @param scientific true to forces the use of the scientific
* notation (e.g. 1.23E3); false
* otherwise.
* @param showZero true if trailing fractional zeros are
* represented; false otherwise.
* @return the corresponding text instance.
* @throws IllegalArgumentException if (digits > 19))
*/
public static Text valueOf(double d, int digits, boolean scientific,
boolean showZero) {
TextBuilder tb = new TextBuilder();
return tb.append(d, digits, scientific, showZero).toText();
}
/**
* Returns the length of this text.
*
* @return the number of characters (16-bits Unicode) composing this text.
*/
public int length() {
return _count;
}
/**
* Returns the concatenation of this text and the textual
* representation of the specified object.
*
* @param obj the object whose textual representation is concatenated.
* @return this.concat(Text.valueOf(obj))
*/
public Text plus(Object obj) {
return this.concat(Text.valueOf(obj));
}
/**
* Returns the concatenation of this text and the specified
* String (optimization).
*
* @param str the string whose characters are concatenated.
* @return this.concat(Text.valueOf(obj))
*/
public Text plus(String str) {
Text merge = this.append(str);
return merge != null ? merge : concat(Text.valueOf(str));
}
private Text append(String str) { // Try to append, returns null if cannot.
int length = str.length();
if (_data == null) {
Text merge = _tail.append(str);
return merge != null ? Text.newComposite(_head, merge) : null;
} else { // Primitive.
if (_count + length > BLOCK_SIZE)
return null; // Cannot merge.
Text text = Text.newPrimitive(_count + length);
System.arraycopy(_data, 0, text._data, 0, _count);
str.getChars(0, length, text._data, _count);
return text;
}
}
/**
* Concatenates the specified text to the end of this text.
* This method is very fast (faster even than
* StringBuffer.append(String)) and still returns
* a text instance with an internal binary tree of minimal depth!
*
* @param that the text that is concatenated.
* @return this + that
*/
public Text concat(Text that) {
// All Text instances are maintained balanced:
// (head < tail * 2) & (tail < head * 2)
final int length = this._count + that._count;
if (length <= BLOCK_SIZE) { // Merges to primitive.
Text text = Text.newPrimitive(length);
this.getChars(0, this._count, text._data, 0);
that.getChars(0, that._count, text._data, this._count);
return text;
} else { // Returns a composite.
Text head = this;
Text tail = that;
if (((head._count << 1) < tail._count) && (tail._data == null)) { // tail is composite
// head too small, returns (head + tail/2) + (tail/2)
if (tail._head._count > tail._tail._count) {
// Rotates to concatenate with smaller part.
tail = tail.rightRotation();
}
head = head.concat(tail._head);
tail = tail._tail;
} else if (((tail._count << 1) < head._count)
&& (head._data == null)) { // head is composite.
// tail too small, returns (head/2) + (head/2 concat tail)
if (head._tail._count > head._head._count) {
// Rotates to concatenate with smaller part.
head = head.leftRotation();
}
tail = head._tail.concat(tail);
head = head._head;
}
return Text.newComposite(head, tail);
}
}
private Text rightRotation() {
// See: http://en.wikipedia.org/wiki/Tree_rotation
Text P = this._head;
if (P._data != null)
return this; // Head not a composite, cannot rotate.
Text A = P._head;
Text B = P._tail;
Text C = this._tail;
return Text.newComposite(A, Text.newComposite(B, C));
}
private Text leftRotation() {
// See: http://en.wikipedia.org/wiki/Tree_rotation
Text Q = this._tail;
if (Q._data != null)
return this; // Tail not a composite, cannot rotate.
Text B = Q._head;
Text C = Q._tail;
Text A = this._head;
return Text.newComposite(Text.newComposite(A, B), C);
}
/**
* Returns a portion of this text.
*
* @param start the index of the first character inclusive.
* @return the sub-text starting at the specified position.
* @throws IndexOutOfBoundsException if (start < 0) ||
* (start > this.length())
*/
public Text subtext(int start) {
return subtext(start, length());
}
/**
* Returns the text having the specified text inserted at
* the specified location.
*
* @param index the insertion position.
* @param txt the text being inserted.
* @return subtext(0, index).concat(txt).concat(subtext(index))
* @throws IndexOutOfBoundsException if (index < 0) ||
* (index > this.length())
*/
public Text insert(int index, Text txt) {
return subtext(0, index).concat(txt).concat(subtext(index));
}
/**
* Returns the text without the characters between the specified indexes.
*
* @param start the beginning index, inclusive.
* @param end the ending index, exclusive.
* @return subtext(0, start).concat(subtext(end))
* @throws IndexOutOfBoundsException if (start < 0) || (end < 0) ||
* (start > end) || (end > this.length()
*/
public Text delete(int start, int end) {
if (start > end)
throw new IndexOutOfBoundsException();
return subtext(0, start).concat(subtext(end));
}
/**
* Replaces each character sequence of this text that matches the specified
* target sequence with the specified replacement sequence.
*
* @param target the character sequence to be replaced.
* @param replacement the replacement sequence.
* @return the resulting text.
*/
public Text replace(java.lang.CharSequence target,
java.lang.CharSequence replacement) {
int i = indexOf(target);
return (i < 0) ? this : // No target sequence found.
subtext(0, i).concat(Text.valueOf(replacement)).concat(
subtext(i + target.length()).replace(target,
replacement));
}
/**
* Replaces the specified characters in this text with the specified
* replacement sequence.
*
* @param charSet the set of characters to be replaced.
* @param replacement the replacement sequence.
* @return the resulting text.
*/
public Text replace(CharSet charSet, java.lang.CharSequence replacement) {
int i = indexOfAny(charSet);
return (i < 0) ? this : // No character to replace.
subtext(0, i).concat(Text.valueOf(replacement)).concat(
subtext(i + 1).replace(charSet, replacement));
}
/**
* Returns {@link #subtext(int, int) subtext(start, end)}.
*
* @param start the index of the first character inclusive.
* @param end the index of the last character exclusive.
* @return this.subtext(start, end)
* @throws IndexOutOfBoundsException if (start < 0) || (end < 0) ||
* (start > end) || (end > this.length())
*/
public java.lang.CharSequence subSequence(int start, int end) {
return subtext(start, end);
}
/**
* Returns the index within this text of the first occurrence
* of the specified character sequence searching forward.
*
* @param csq a character sequence.
* @return the index of the first character of the character sequence found;
* or -1 if the character sequence is not found.
*/
public int indexOf(java.lang.CharSequence csq) {
return indexOf(csq, 0);
}
/**
* Returns the index within this text of the first occurrence
* of the specified characters sequence searching forward from
* the specified index.
*
* @param csq a character sequence.
* @param fromIndex the index to start the search from.
* @return the index in the range
* [fromIndex, length() - csq.length()]
* or -1 if the character sequence is not found.
*/
public int indexOf(java.lang.CharSequence csq, int fromIndex) {
// Limit cases.
final int csqLength = csq.length();
final int min = Math.max(0, fromIndex);
final int max = _count - csqLength;
if (csqLength == 0) { return (min > max) ? -1 : min; }
// Searches for csq.
final char c = csq.charAt(0);
for (int i = indexOf(c, min); (i >= 0) && (i <= max); i = indexOf(c,
++i)) {
boolean match = true;
for (int j = 1; j < csqLength; j++) {
if (this.charAt(i + j) != csq.charAt(j)) {
match = false;
break;
}
}
if (match) { return i; }
}
return -1;
}
/**
* Returns the index within this text of the last occurrence of
* the specified characters sequence searching backward.
*
* @param csq a character sequence.
* @return the index of the first character of the character sequence found;
* or -1 if the character sequence is not found.
*/
public int lastIndexOf(java.lang.CharSequence csq) {
return lastIndexOf(csq, _count);
}
/**
* Returns the index within this text of the last occurrence of
* the specified character sequence searching backward from the specified
* index.
*
* @param csq a character sequence.
* @param fromIndex the index to start the backward search from.
* @return the index in the range [0, fromIndex] or
* -1 if the character sequence is not found.
*/
public int lastIndexOf(java.lang.CharSequence csq, int fromIndex) {
// Limit cases.
final int csqLength = csq.length();
final int min = 0;
final int max = Math.min(fromIndex, _count - csqLength);
if (csqLength == 0) { return (min > max) ? -1 : max; }
// Searches for csq.
final char c = csq.charAt(0);
for (int i = lastIndexOf(c, max); (i >= 0); i = lastIndexOf(c, --i)) {
boolean match = true;
for (int j = 1; j < csqLength; j++) {
if (this.charAt(i + j) != csq.charAt(j)) {
match = false;
break;
}
}
if (match) { return i; }
}
return -1;
}
/**
* Indicates if this text 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 text; false otherwise.
*/
public boolean startsWith(java.lang.CharSequence prefix) {
return startsWith(prefix, 0);
}
/**
* Indicates if this text 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 text; false otherwise.
*/
public boolean endsWith(java.lang.CharSequence suffix) {
return startsWith(suffix, length() - suffix.length());
}
/**
* Indicates if this text starts with the specified prefix
* at the specified index.
*
* @param prefix the prefix.
* @param index the index of the prefix location in this string.
* @return this.substring(index).startsWith(prefix)
*/
public boolean startsWith(java.lang.CharSequence prefix, int index) {
final int prefixLength = prefix.length();
if ((index >= 0) && (index <= (this.length() - prefixLength))) {
for (int i = 0, j = index; i < prefixLength;) {
if (prefix.charAt(i++) != this.charAt(j++)) { return false; }
}
return true;
} else {
return false;
}
}
/**
* Returns a copy of this text, with leading and trailing
* whitespace omitted.
*
* @return a copy of this text with leading and trailing white
* space removed, or this text if it has no leading or
* trailing white space.
*/
public Text trim() {
int first = 0; // First character index.
int last = length() - 1; // Last character index.
while ((first <= last) && (charAt(first) <= ' ')) {
first++;
}
while ((last >= first) && (charAt(last) <= ' ')) {
last--;
}
return subtext(first, last + 1);
}
/**
* Returns a text equals to this one from a pool of
* unique text instances.
*
* @return an unique text instance allocated in permanent memory.
*/
public Text intern() {
Text txt = INTERN.putIfAbsent(this, this);
return txt == null ? this : txt;
}
/**
* Indicates if this text has the same character content as the specified
* character sequence.
*
* @param csq the character sequence to compare with.
* @return true if the specified character sequence has the
* same character content as this text; false otherwise.
*/
public boolean contentEquals(java.lang.CharSequence csq) {
if (csq.length() != _count)
return false;
for (int i = 0; i < _count;) {
if (this.charAt(i) != csq.charAt(i++))
return false;
}
return true;
}
/**
* Indicates if this text has the same character contend as the specified
* character sequence ignoring case considerations.
*
* @param csq the CharSequence to compare this text against.
* @return true if the argument and this text are equal,
* ignoring case; false otherwise.
*/
public boolean contentEqualsIgnoreCase(java.lang.CharSequence csq) {
if (this._count != csq.length())
return false;
for (int i = 0; i < _count;) {
char u1 = this.charAt(i);
char u2 = csq.charAt(i++);
if (u1 != u2) {
u1 = Character.toUpperCase(u1);
u2 = Character.toUpperCase(u2);
if ((u1 != u2)
&& (Character.toLowerCase(u1) != Character
.toLowerCase(u2)))
return false;
}
}
return true;
}
/**
* Compares this text against the specified object for equality.
* Returns true if the specified object is a text having
* the same character sequence as this text.
* For generic comparaison with any character sequence the
* {@link #contentEquals(CharSequence)} should be used.
*
* @param obj the object to compare with or null.
* @return true if that is a text with the same character
* sequence as this text; false otherwise.
*/
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (!(obj instanceof Text))
return false;
final Text that = (Text) obj;
if (this._count != that._count)
return false;
for (int i = 0; i < _count;) {
if (this.charAt(i) != that.charAt(i++))
return false;
}
return true;
}
/**
* Returns the hash code for this text.
*
* @return the hash code value.
*/
@Override
public int hashCode() {
int h = 0;
final int length = this.length();
for (int i = 0; i < length;) {
h = 31 * h + charAt(i++);
}
return h;
}
/**
* Compares this text to another character sequence or string
* lexicographically.
*
* @param csq the character sequence to be compared.
* @return TypeFormat.LEXICAL_COMPARATOR.compare(this, csq)
* @throws ClassCastException if the specifed object is not a
* CharSequence or a String.
*/
public int compareTo(CharSequence csq) {
return Equalities.LEXICAL.compare(this, csq);
}
/**
* Returns this (implements
* {@link javolution.lang.ValueType Realtime} interface).
*
* @return this
*/
public Text toText() {
return this;
}
/**
* Prints the current statistics on this text tree structure.
*
* @param out the stream to use for output (e.g. System.out)
*/
public void printStatistics(PrintStream out) {
int length = this.length();
int leaves = getNbrOfLeaves();
synchronized (out) {
out.print("LENGTH: " + length());
out.print(", MAX DEPTH: " + getDepth());
out.print(", NBR OF BRANCHES: " + getNbrOfBranches());
out.print(", NBR OF LEAVES: " + leaves);
out.print(", AVG LEAVE LENGTH: " + (length + (leaves >> 1))
/ leaves);
out.println();
}
}
private int getDepth() {
if (_data != null) // Primitive.
return 0;
return MathLib.max(_head.getDepth(), _tail.getDepth()) + 1;
}
private int getNbrOfBranches() {
return (_data == null) ? _head.getNbrOfBranches()
+ _tail.getNbrOfBranches() + 1 : 0;
}
private int getNbrOfLeaves() {
return (_data == null) ? _head.getNbrOfLeaves()
+ _tail.getNbrOfLeaves() : 1;
}
/**
* Converts the characters of this text to lower case.
*
* @return the text in lower case.
* @see Character#toLowerCase(char)
*/
public Text toLowerCase() {
if (_data == null) // Composite.
return Text.newComposite(_head.toLowerCase(), _tail.toLowerCase());
Text text = Text.newPrimitive(_count);
for (int i = 0; i < _count;) {
text._data[i] = Character.toLowerCase(_data[i++]);
}
return text;
}
/**
* Converts the characters of this text to upper case.
*
* @return the text in lower case.
* @see Character#toUpperCase(char)
*/
public Text toUpperCase() {
if (_data == null) // Composite.
return newComposite(_head.toUpperCase(), _tail.toUpperCase());
Text text = Text.newPrimitive(_count);
for (int i = 0; i < _count;) {
text._data[i] = Character.toUpperCase(_data[i++]);
}
return text;
}
/**
* Returns the character at the specified index.
*
* @param index the index of the character.
* @return the character at the specified index.
* @throws IndexOutOfBoundsException if (index < 0) ||
* (index >= this.length())
*/
public char charAt(int index) {
if (index >= _count)
throw new IndexOutOfBoundsException();
return (_data != null) ? _data[index] : (index < _head._count) ? _head
.charAt(index) : _tail.charAt(index - _head._count);
}
/**
* Returns the index within this text of the first occurrence of the
* specified character, starting the search at the beginning.
*
* @param c the character to search for.
* @return the index of the first occurrence of the character in this text
* that is greater than or equal to 0,
* or -1 if the character does not occur.
*/
public int indexOf(char c) {
return indexOf(c, 0);
}
/**
* Returns the index within this text of the first occurrence of the
* specified character, starting the search at the specified index.
*
* @param c the character to search for.
* @param fromIndex the index to start the search from.
* @return the index of the first occurrence of the character in this text
* that is greater than or equal to fromIndex,
* or -1 if the character does not occur.
*/
public int indexOf(char c, int fromIndex) {
if (_data != null) { // Primitive.
for (int i = MathLib.max(fromIndex, 0); i < _count; i++) {
if (_data[i] == c)
return i;
}
return -1;
} else { // Composite.
final int cesure = _head._count;
if (fromIndex < cesure) {
final int headIndex = _head.indexOf(c, fromIndex);
if (headIndex >= 0)
return headIndex; // Found in head.
}
final int tailIndex = _tail.indexOf(c, fromIndex - cesure);
return (tailIndex >= 0) ? tailIndex + cesure : -1;
}
}
/**
* Returns the index within this text of the first occurrence of the
* specified character, searching backward and starting at the specified
* index.
*
* @param c the character to search for.
* @param fromIndex the index to start the search backward from.
* @return the index of the first occurrence of the character in this text
* that is less than or equal to fromIndex,
* or -1 if the character does not occur.
*/
public int lastIndexOf(char c, int fromIndex) {
if (_data != null) { // Primitive.
for (int i = MathLib.min(fromIndex, _count - 1); i >= 0; i--) {
if (_data[i] == c)
return i;
}
return -1;
} else { // Composite.
final int cesure = _head._count;
if (fromIndex >= cesure) {
final int tailIndex = _tail.lastIndexOf(c, fromIndex - cesure);
if (tailIndex >= 0)
return tailIndex + cesure; // Found in tail.
}
return _head.lastIndexOf(c, fromIndex);
}
}
/**
* Returns a portion of this text.
*
* @param start the index of the first character inclusive.
* @param end the index of the last character exclusive.
* @return the sub-text starting at the specified start position and
* ending just before the specified end position.
* @throws IndexOutOfBoundsException if (start < 0) || (end < 0) ||
* (start > end) || (end > this.length())
*/
public Text subtext(int start, int end) {
if (_data != null) { // Primitive.
if ((start < 0) || (start > end) || (end > _count))
throw new IndexOutOfBoundsException();
if ((start == 0) && (end == _count))
return this;
if (start == end)
return Text.EMPTY;
int length = end - start;
Text text = Text.newPrimitive(length);
System.arraycopy(_data, start, text._data, 0, length);
return text;
} else { // Composite.
final int cesure = _head._count;
if (end <= cesure)
return _head.subtext(start, end);
if (start >= cesure)
return _tail.subtext(start - cesure, end - cesure);
if ((start == 0) && (end == _count))
return this;
// Overlaps head and tail.
return _head.subtext(start, cesure).concat(
_tail.subtext(0, end - cesure));
}
}
/**
* Copies the characters from this text into the destination
* character array.
*
* @param start the index of the first character to copy.
* @param end the index after the last character to copy.
* @param dest the destination array.
* @param destPos the start offset in the destination array.
* @throws IndexOutOfBoundsException if (start < 0) || (end < 0) ||
* (start > end) || (end > this.length())
*/
public void getChars(int start, int end, char dest[], int destPos) {
if (_data != null) { // Primitive.
if ((start < 0) || (end > _count) || (start > end))
throw new IndexOutOfBoundsException();
System.arraycopy(_data, start, dest, destPos, end - start);
} else { // Composite.
final int cesure = _head._count;
if (end <= cesure) {
_head.getChars(start, end, dest, destPos);
} else if (start >= cesure) {
_tail.getChars(start - cesure, end - cesure, dest, destPos);
} else { // Overlaps head and tail.
_head.getChars(start, cesure, dest, destPos);
_tail.getChars(0, end - cesure, dest, destPos + cesure - start);
}
}
}
/**
* Returns the String representation of this text.
*
* @return the java.lang.String for this text.
*/
public String toString() {
if (_data != null) { // Primitive.
return new String(_data, 0, _count);
} else { // Composite.
char[] data = new char[_count];
this.getChars(0, _count, data, 0);
return new String(data, 0, _count);
}
}
// Implements ValueType interface.
public Text copy() {
if (_data != null) { // Primitive.
Text text = Text.newPrimitive(_count);
System.arraycopy(_data, 0, text._data, 0, _count);
return text;
} else { // Composite.
return Text.newComposite((Text) _head.copy(), (Text) _tail.copy());
}
}
//////////////////////////////////////////////////////////////////
// Wilfried add-ons (methods provided by Microsoft .Net in C#)
//
/**
* Returns the text that contains a specific length sequence of the
* character specified.
*
* @param c the character to fill this text with.
* @param length the length of the text returned.
* @return the corresponding instance.
* @throws IndexOutOfBoundsException if (length < 0)
*/
public static Text valueOf(char c, int length) {
if (length < 0)
throw new IndexOutOfBoundsException();
if (length <= BLOCK_SIZE) {
Text text = Text.newPrimitive(length);
for (int i = 0; i < length;) {
text._data[i++] = c;
}
return text;
} else {
final int middle = (length >> 1);
return Text.newComposite(Text.valueOf(c, middle),
Text.valueOf(c, length - middle));
}
}
/**
* Indicates if all characters of this text are whitespaces
* (no characters greater than the space character).
*
*@return true if this text contains only whitespace.
*/
public boolean isBlank() {
return isBlank(0, length());
}
/**
* Indicates if the specified sub-range of characters of this text
* are whitespaces (no characters greater than the space character).
*
*@param start the start index.
*@param length the number of characters to inspect.
*/
public boolean isBlank(int start, int length) {
for (; start < length; start++) {
if (charAt(start) > ' ')
return false;
}
return true;
}
/**
* Returns a copy of this text, with leading whitespace omitted.
*
* @return a copy of this text with leading white space removed,
* or this text if it has no leading white space.
*/
public Text trimStart() {
int first = 0; // First character index.
int last = length() - 1; // Last character index.
while ((first <= last) && (charAt(first) <= ' ')) {
first++;
}
return subtext(first, last + 1);
}
/**
* Returns a copy of this text, with trailing
* whitespace omitted.
*
* @return a copy of this text with trailing white space removed,
* or this text if it has no trailing white space.
*/
public Text trimEnd() {
int first = 0; // First character index.
int last = length() - 1; // Last character index.
while ((last >= first) && (charAt(last) <= ' ')) {
last--;
}
return subtext(first, last + 1);
}
/**
* Pads this text on the left with spaces to make the minimum total length
* as specified.
* The new length of the new text is equal to the original length plus
* (length()-len) spaces.
*
* @param len the total number of characters to make this text equal to.
* @return a new text or the same text if no padding required.
* @throws an IllegalArgumentException if the (len<0).
*/
public Text padLeft(int len) {
return padLeft(len, ' ');
}
/**
* Pads this text on the left to make the minimum total length as specified.
* Spaces or the given Unicode character are used to pad with.
*
* The new length of the new text is equal to the original length plus
* (length()-len) pad characters.
*
* @param len the total number of characters to make this text equal to.
* @param c the character to pad using.
* @return a new text or the same text if no padding required.
* @throws an IllegalArgumentException if the (len<0).
*/
public Text padLeft(int len, char c) {
final int padSize = (len <= length()) ? 0 : len - length();
return insert(0, Text.valueOf(c, padSize));
}
/**
* Pads this text on the right with spaces to make the minimum total length
* as specified.
* The new length of the new text is equal to the original length plus
* (length()-len) spaces.
*
* @param len the total number of characters to make this text equal to.
* @return a new text or the same text if no padding required.
* @throws an IllegalArgumentException if the (len<0).
*/
public Text padRight(int len) {
return padRight(len, ' ');
}
/**
* Pads this text on the right to make the minimum total length as specified.
* Spaces or the given Unicode character are used to pad with.
*
* The new length of the new text is equal to the original length plus
* (length()-len) pad characters.
*
* @param len the total number of characters to make this text equal to.
* @param c the character to pad using.
* @return a new text or the same text if no padding required.
* @throws an IllegalArgumentException if the (len<0).
*/
public Text padRight(int len, char c) {
final int padSize = (len <= length()) ? 0 : len - length();
return concat(Text.valueOf(c, padSize));
}
/**
* Returns the index within this text of the first occurrence
* of any character in the specified character set.
*
* @param charSet the character set.
* @return the index of the first character that matches one of the
* characters in the supplied set; or -1 if none.
*/
public int indexOfAny(CharSet charSet) {
return indexOfAny(charSet, 0, length());
}
/**
* Returns the index within a region of this text of the first occurrence
* of any character in the specified character set.
*
* @param charSet the character set.
* @param start the index of the start of the search region in this text.
* @return the index of the first character that matches one of the
* characters in the supplied set; or -1 if none.
*/
public int indexOfAny(CharSet charSet, int start) {
return indexOfAny(charSet, start, length() - start);
}
/**
* Returns the index within a region of this text of the first occurrence
* of any character in the specified character set.
*
* @param charSet the character set.
* @param start the index of the start of the search region in this text.
* @param length the length of the region to search.
* @return the index of the first character that matches one of the
* characters in the supplied array; or -1 if none.
*/
public int indexOfAny(CharSet charSet, int start, int length) {
final int stop = start + length;
for (int i = start; i < stop; i++) {
if (charSet.contains(charAt(i)))
return i;
}
return -1;
}
/**
* Returns the index within this text of the last occurrence
* of any character in the specified character set.
*
* @param charSet the character set.
* @return the index of the last character that matches one of the
* characters in the supplied array; or -1 if none.
*/
public int lastIndexOfAny(CharSet charSet) {
return lastIndexOfAny(charSet, 0, length());
}
/**
* Returns the index within a region of this text of the last occurrence
* of any character in the specified character set.
*
* @param charSet the character set.
* @param start the index of the start of the search region in this text.
* @return the index of the last character that matches one of the
* characters in the supplied array; or -1 if none.
*/
public int lastIndexOfAny(CharSet charSet, int start) {
return lastIndexOfAny(charSet, start, length() - start);
}
/**
* Returns the index within a region of this text of the last occurrence
* of any character in the specified character set.
*
* @param charSet the character set.
* @param start the index of the start of the search region in this text.
* @param length the length of the region to search.
* @return the index of the last character that matches one of the
* characters in the supplied array; or -1 if none.
*/
public int lastIndexOfAny(CharSet charSet, int start, int length) {
for (int i = start + length; --i >= start;) {
if (charSet.contains(charAt(i)))
return i;
}
return -1;
}
//
////////////////////////////////////////////////////////////////////////////
/**
* Returns a {@link javolution.context.AllocatorContext context allocated}
* primitive text instance.
*
* @param length the primitive length.
*/
private static Text newPrimitive(int length) {
Text text = new Text(true);
text._count = length;
return text;
}
/**
* Returns a {@link javolution.context.AllocatorContext context allocated}
* composite text instance.
*
* @param head the composite head.
* @param tail the composite tail.
*/
private static Text newComposite(Text head, Text tail) {
Text text = new Text(false);
text._count = head._count + tail._count;
text._head = head;
text._tail = tail;
return text;
}
@Override
public Text value() {
return this;
}
}