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A PHP engine implemented in 100% Java
/*
* Copyright (c) 1998-2012 Caucho Technology -- all rights reserved
*
* This file is part of Resin(R) Open Source
*
* Each copy or derived work must preserve the copyright notice and this
* notice unmodified.
*
* Resin Open Source is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* Resin Open Source is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, or any warranty
* of NON-INFRINGEMENT. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with Resin Open Source; if not, write to the
* Free SoftwareFoundation, Inc.
* 59 Temple Place, Suite 330
* Boston, MA 02111-1307 USA
*
* @author Scott Ferguson
*/
package com.caucho.util;
/**
* CharSegment is a section of a character buffer
*/
public class CharSegment implements CharSequence {
protected char []_buffer;
protected int _offset;
protected int _length;
public CharSegment()
{
}
/**
* Constructs a char segment based on a char array.
*/
public CharSegment(char []buffer, int offset, int length)
{
_buffer = buffer;
_offset = offset;
_length = length;
}
/**
* Sets the char segment to a new buffer triple.
*/
public void init(char []buffer, int offset, int length)
{
_buffer = buffer;
_offset = offset;
_length = length;
}
/**
* Returns the character count of the buffer's contents.
*/
public final int length()
{
return _length;
}
/**
* Returns the buffer length
*/
public final int getLength()
{
return _length;
}
public final int getOffset()
{
return _offset;
}
/**
* Returns the char at the specified offset.
*/
public char charAt(int i)
{
if (i < 0 || _length <= i)
throw new IndexOutOfBoundsException();
return _buffer[i + _offset];
}
/**
* Returns the last character of the buffer
*
* @throws IndexOutOfBoundsException for an empty buffer
*/
public char getLastChar()
{
if (_length == 0)
throw new IndexOutOfBoundsException();
return _buffer[_offset + _length - 1];
}
/**
* Returns the buffer's char array.
*/
public char []getBuffer()
{
return _buffer;
}
/**
* Copies characters to the destination buffer.
*/
public void getChars(int srcBegin, int srcEnd, char []dst, int dstBegin)
{
srcBegin += _offset;
srcEnd += _offset;
char []buffer = _buffer;
while (srcBegin < srcEnd)
dst[dstBegin++] = buffer[srcBegin++];
}
/**
* Returns a substring
*/
public String substring(int start)
{
if (_length < start || start < 0)
throw new StringIndexOutOfBoundsException();
return new String(_buffer, _offset + start, _length - start);
}
/**
* Returns a substring
*/
public String substring(int start, int end)
{
if (_length < start || start < 0 || end < start)
throw new StringIndexOutOfBoundsException();
return new String(_buffer, _offset + start, end - start);
}
/**
* Returns a subsequence
*/
public CharSequence subSequence(int start, int end)
{
if (_length < start || start < 0 || end < start)
throw new StringIndexOutOfBoundsException();
return new String(_buffer, _offset + start, end - start);
}
/**
* Returns the index of a character in the CharSegment.
*/
public int indexOf(char ch)
{
return indexOf(ch, 0);
}
/**
* Returns the index of a character in the CharSegment starting
* from an offset.
*/
public final int indexOf(char ch, int start)
{
if (start < 0)
start = 0;
int end = _offset + _length;
start += _offset;
char []buffer = _buffer;
for (; start < end; start++) {
if (buffer[start] == ch)
return start - _offset;
}
return -1;
}
/**
* Returns the last index of a character in the CharSegment.
*/
public final int lastIndexOf(char ch)
{
return lastIndexOf(ch, _length - 1);
}
/**
* Returns the last index of a character in the CharSegment starting
* from an offset.
*/
public final int lastIndexOf(char ch, int start)
{
if (_length <= start)
start = _length - 1;
char []buffer = _buffer;
int offset = _offset;
for (; start >= 0; start--) {
if (buffer[start + offset] == ch)
return start;
}
return -1;
}
public int indexOf(String s)
{
return indexOf(s, 0);
}
public int indexOf(String s, int start)
{
int slen = s.length();
if (start < 0)
start = 0;
int end = _offset + _length - slen + 1;
start += _offset;
char []buffer = _buffer;
for (; start < end; start++) {
int i = 0;
for (; i < slen; i++) {
if (buffer[start+i] != s.charAt(i))
break;
}
if (i == slen)
return start - _offset;
}
return -1;
}
/**
* Returns the buffer's hash code
*/
public int hashCode()
{
int hash = 0;
char []buffer = _buffer;
int begin = _offset;
int end = begin + _length;
for (; begin < end; begin++)
hash = 65521 * hash + buffer[begin] * 251 + 1021;
return hash;
}
/*
* Predicate testing if two char segments are equal
*/
public final boolean equals(Object a)
{
if (this == a)
return true;
else if (a instanceof CharSegment) {
CharSegment cb = (CharSegment) a;
int length = _length;
if (length != cb._length)
return false;
char []buffer = _buffer;
char []aBuffer = cb._buffer;
int offset = _offset;
int aOffset = cb._offset;
for (int i = length - 1; i >= 0; i--)
if (buffer[offset + i] != aBuffer[aOffset + i])
return false;
return true;
}
else if (a instanceof CharSequence) {
CharSequence seq = (CharSequence) a;
int length = seq.length();
if (_length != length)
return false;
for (int i = length - 1; i >= 0; i--) {
if (_buffer[i] != seq.charAt(i))
return false;
}
return true;
}
else
return false;
}
/**
* Returns true if the two char segments are equal.
*/
public boolean equals(CharSegment cb)
{
int length = _length;
if (length != cb._length)
return false;
char []buffer = _buffer;
char []aBuffer = cb._buffer;
int offset = _offset;
int aOffset = cb._offset;
for (int i = length - 1; i >= 0; i--)
if (buffer[offset + i] != aBuffer[aOffset + i])
return false;
return true;
}
/**
* Returns true if the CharSegment equals the char array.
*/
public final boolean equals(char []cb, int length)
{
if (length != _length)
return false;
int offset = _offset;
char []buffer = _buffer;
for (int i = _length - 1; i >= 0; i--)
if (buffer[offset + i] != cb[i])
return false;
return true;
}
/**
* Returns true if the CharSegment equals the char array.
*/
public final boolean equals(char []cb, int offset, int length)
{
if (length != _length)
return false;
int selfOffset = _offset;
char []buffer = _buffer;
for (int i = _length - 1; i >= 0; i--)
if (buffer[selfOffset + i] != cb[i + offset])
return false;
return true;
}
/**
* Returns true if the CharSegment equals the string.
*/
public final boolean equalsIgnoreCase(String a)
{
int len = a.length();
if (_length != len)
return false;
int offset = _offset;
char []buffer = _buffer;
for (int i = 0; i < len; i++) {
char ca = buffer[offset + i];
char cb = a.charAt(i);
if (ca == cb) {
}
else if (Character.toLowerCase(ca) != Character.toLowerCase(cb))
return false;
}
return true;
}
/**
* Returns true if the two CharSegments are equivalent ignoring the case.
*/
public final boolean equalsIgnoreCase(CharSegment b)
{
int length = _length;
if (length != b._length)
return false;
char []buffer = _buffer;
char []bBuffer = b._buffer;
int offset = _offset;
int bOffset = b._offset;
for (int i = length - 1; i >= 0; i--) {
char ca = buffer[offset + i];
char cb = bBuffer[bOffset + i];
if (ca != cb &&
Character.toLowerCase(ca) != Character.toLowerCase(cb))
return false;
}
return true;
}
/*
* XXX: unsure is this is legit
*/
public final boolean matches(Object a)
{
if (a instanceof CharSegment) {
CharSegment cb = (CharSegment) a;
if (_length != cb._length)
return false;
int offset = _offset;
int bOffset = cb._offset;
char []buffer = _buffer;
char []cbBuffer = cb._buffer;
for (int i = _length - 1; i >= 0; i--)
if (buffer[offset + i] != cbBuffer[bOffset + i])
return false;
return true;
} else if (a instanceof String) {
String sa = (String) a;
if (_length != sa.length())
return false;
int offset = _offset;
char []buffer = _buffer;
for (int i = _length - 1; i >= 0; i--)
if (buffer[i + offset] != sa.charAt(i))
return false;
return true;
} else
return false;
}
/**
* Returns true if the charSegment matches the string.
*/
public boolean matches(String sa)
{
if (_length != sa.length())
return false;
char []buffer = _buffer;
int offset = _offset;
for (int i = _length - 1; i >= 0; i--)
if (_buffer[_offset + i] != sa.charAt(i))
return false;
return true;
}
/**
* Returns true if the CharSegment matches the string, ignoring the case.
*/
public boolean matchesIgnoreCase(String sa)
{
if (_length != sa.length())
return false;
char []buffer = _buffer;
int offset = _offset;
for (int i = _length - 1; i >= 0; i--) {
char ca = buffer[offset + i];
char cb = sa.charAt(i);
if (ca != cb && Character.toLowerCase(ca) != Character.toLowerCase(cb))
return false;
}
return true;
}
public boolean regionMatches(int off1, CharSegment buf, int off2, int len)
{
if (_length < off1 + len || buf._length < off2 + len)
return false;
char []buffer = _buffer;
char []bufBuffer = buf._buffer;
for (int i = len - 1; i >= 0; i--) {
if (buffer[off1 + i] != bufBuffer[off2 + i])
return false;
}
return true;
}
public boolean regionMatches(int off1, String buf, int off2, int len)
{
if (_length < off1 + len || buf.length() < off2 + len)
return false;
char []buffer = _buffer;
for (int i = 0; i < len; i++) {
if (buffer[off1 + i] != buf.charAt(off2 + i))
return false;
}
return true;
}
public boolean regionMatchesIgnoreCase(int off1, CharSegment buf,
int off2, int len)
{
if (_length < off1 + len || buf._length < off2 + len)
return false;
char []buffer = _buffer;
char []bufBuffer = buf._buffer;
for (int i = len -1; i >= 0; i--) {
if (Character.toLowerCase(buffer[off1 + i]) !=
Character.toLowerCase(bufBuffer[off2 + i]))
return false;
}
return true;
}
/**
* Returns true if the CharSegment starts with the string.
*/
public boolean startsWith(String string)
{
if (string == null)
return false;
int strlen = string.length();
if (_length < strlen)
return false;
char []buffer = _buffer;
int offset = _offset;
while (--strlen >= 0) {
if (buffer[offset + strlen] != string.charAt(strlen))
return false;
}
return true;
}
/**
* Returns true if the CharSegment ends with the string.
*/
public boolean endsWith(String string)
{
if (string == null)
return false;
int strlen = string.length();
if (_length < strlen)
return false;
char []buffer = _buffer;
int offset = _offset + _length - strlen;
while (--strlen >= 0) {
if (buffer[offset + strlen] != string.charAt(strlen))
return false;
}
return true;
}
/**
* Returns true if the CharSegment ends with the char segment.
*/
public boolean endsWith(CharSegment cb)
{
if (cb == null)
return false;
int strlen = cb._length;
if (_length < strlen)
return false;
char []buffer = _buffer;
int offset = _offset + _length - strlen;
char []cbBuffer = cb._buffer;
int cbOffset = cb._offset;
while (--strlen >= 0) {
if (buffer[offset + strlen] != cbBuffer[cbOffset + strlen])
return false;
}
return true;
}
/**
* Converts the contents of the segment to lower case.
*/
public CharSegment toLowerCase()
{
char []buffer = _buffer;
int len = _length;
int offset = _offset;
while (--len >= 0)
buffer[offset + len] = Character.toLowerCase(buffer[offset + len]);
return this;
}
/**
* String representation of the buffer.
*/
public String toString()
{
return new String(_buffer, _offset, _length);
}
}