/* ====================================================================
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to You under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
==================================================================== */
package org.apache.poi.util;
import java.io.UnsupportedEncodingException;
import java.text.FieldPosition;
import java.text.NumberFormat;
/**
* Title: String Utility Description: Collection of string handling utilities
*
*
*@author Andrew C. Oliver
*@author Sergei Kozello (sergeikozello at mail.ru)
*@author Toshiaki Kamoshida (kamoshida.toshiaki at future dot co dot jp)
*@since May 10, 2002
*@version 1.0
*/
public class StringUtil {
private final static String ENCODING = "ISO-8859-1";
/**
* Constructor for the StringUtil object
*/
private StringUtil() {
}
/**
* Given a byte array of 16-bit unicode characters in Little Endian
* format (most important byte last), return a Java String representation
* of it.
*
* { 0x16, 0x00 } -0x16
*
* @param string the byte array to be converted
* @param offset the initial offset into the
* byte array. it is assumed that string[ offset ] and string[ offset +
* 1 ] contain the first 16-bit unicode character
* @param len the length of the final string
* @return the converted string
* @exception ArrayIndexOutOfBoundsException if offset is out of bounds for
* the byte array (i.e., is negative or is greater than or equal to
* string.length)
* @exception IllegalArgumentException if len is too large (i.e.,
* there is not enough data in string to create a String of that
* length)
*/
public static String getFromUnicodeLE(
final byte[] string,
final int offset,
final int len)
throws ArrayIndexOutOfBoundsException, IllegalArgumentException {
if ((offset < 0) || (offset >= string.length)) {
throw new ArrayIndexOutOfBoundsException("Illegal offset");
}
if ((len < 0) || (((string.length - offset) / 2) < len)) {
throw new IllegalArgumentException("Illegal length");
}
try {
return new String(string, offset, len * 2, "UTF-16LE");
} catch (UnsupportedEncodingException e) {
throw new InternalError(); /*unreachable*/
}
}
/**
* Given a byte array of 16-bit unicode characters in little endian
* format (most important byte last), return a Java String representation
* of it.
*
* { 0x16, 0x00 } -0x16
*
*@param string the byte array to be converted
*@return the converted string
*/
public static String getFromUnicodeLE(final byte[] string) {
if(string.length == 0) { return ""; }
return getFromUnicodeLE(string, 0, string.length / 2);
}
/**
* Given a byte array of 16-bit unicode characters in big endian
* format (most important byte first), return a Java String representation
* of it.
*
* { 0x00, 0x16 } -0x16
*
*@param string the byte array to be converted
**@param offset the initial offset into the
* byte array. it is assumed that string[ offset ] and string[ offset +
* 1 ] contain the first 16-bit unicode character
*@param len the length of the final string
*@return the converted string
*@exception ArrayIndexOutOfBoundsException if offset is out of bounds for
* the byte array (i.e., is negative or is greater than or equal to
* string.length)
*@exception IllegalArgumentException if len is too large (i.e.,
* there is not enough data in string to create a String of that
* length)
*/
public static String getFromUnicodeBE(
final byte[] string,
final int offset,
final int len)
throws ArrayIndexOutOfBoundsException, IllegalArgumentException {
if ((offset < 0) || (offset >= string.length)) {
throw new ArrayIndexOutOfBoundsException("Illegal offset");
}
if ((len < 0) || (((string.length - offset) / 2) < len)) {
throw new IllegalArgumentException("Illegal length");
}
try {
return new String(string, offset, len * 2, "UTF-16BE");
} catch (UnsupportedEncodingException e) {
throw new InternalError(); /*unreachable*/
}
}
/**
* Given a byte array of 16-bit unicode characters in big endian
* format (most important byte first), return a Java String representation
* of it.
*
* { 0x00, 0x16 } -0x16
*
*@param string the byte array to be converted
*@return the converted string
*/
public static String getFromUnicodeBE(final byte[] string) {
if(string.length == 0) { return ""; }
return getFromUnicodeBE(string, 0, string.length / 2);
}
/**
* Read 8 bit data (in ISO-8859-1 codepage) into a (unicode) Java
* String and return.
* (In Excel terms, read compressed 8 bit unicode as a string)
*
* @param string byte array to read
* @param offset offset to read byte array
* @param len length to read byte array
* @return String generated String instance by reading byte array
*/
public static String getFromCompressedUnicode(
final byte[] string,
final int offset,
final int len) {
try {
return new String(string, offset, len, "ISO-8859-1");
} catch (UnsupportedEncodingException e) {
throw new InternalError(); /* unreachable */
}
}
/**
* Takes a unicode (java) string, and returns it as 8 bit data (in ISO-8859-1
* codepage).
* (In Excel terms, write compressed 8 bit unicode)
*
*@param input the String containing the data to be written
*@param output the byte array to which the data is to be written
*@param offset an offset into the byte arrat at which the data is start
* when written
*/
public static void putCompressedUnicode(
final String input,
final byte[] output,
final int offset) {
try {
byte[] bytes = input.getBytes("ISO-8859-1");
System.arraycopy(bytes, 0, output, offset, bytes.length);
} catch (UnsupportedEncodingException e) {
throw new InternalError(); /*unreachable*/
}
}
/**
* Takes a unicode string, and returns it as little endian (most
* important byte last) bytes in the supplied byte array.
* (In Excel terms, write uncompressed unicode)
*
*@param input the String containing the unicode data to be written
*@param output the byte array to hold the uncompressed unicode, should be twice the length of the String
*@param offset the offset to start writing into the byte array
*/
public static void putUnicodeLE(
final String input,
final byte[] output,
final int offset) {
try {
byte[] bytes = input.getBytes("UTF-16LE");
System.arraycopy(bytes, 0, output, offset, bytes.length);
} catch (UnsupportedEncodingException e) {
throw new InternalError(); /*unreachable*/
}
}
/**
* Takes a unicode string, and returns it as big endian (most
* important byte first) bytes in the supplied byte array.
* (In Excel terms, write uncompressed unicode)
*
*@param input the String containing the unicode data to be written
*@param output the byte array to hold the uncompressed unicode, should be twice the length of the String
*@param offset the offset to start writing into the byte array
*/
public static void putUnicodeBE(
final String input,
final byte[] output,
final int offset) {
try {
byte[] bytes = input.getBytes("UTF-16BE");
System.arraycopy(bytes, 0, output, offset, bytes.length);
} catch (UnsupportedEncodingException e) {
throw new InternalError(); /*unreachable*/
}
}
/**
* Apply printf() like formatting to a string.
* Primarily used for logging.
*@param message the string with embedded formatting info
* eg. "This is a test %2.2"
*@param params array of values to format into the string
*@return The formatted string
*/
public static String format(String message, Object[] params) {
int currentParamNumber = 0;
StringBuffer formattedMessage = new StringBuffer();
for (int i = 0; i < message.length(); i++) {
if (message.charAt(i) == '%') {
if (currentParamNumber >= params.length) {
formattedMessage.append("?missing data?");
} else if (
(params[currentParamNumber] instanceof Number)
&& (i + 1 < message.length())) {
i
+= matchOptionalFormatting(
(Number) params[currentParamNumber++],
message.substring(i + 1),
formattedMessage);
} else {
formattedMessage.append(
params[currentParamNumber++].toString());
}
} else {
if ((message.charAt(i) == '\\')
&& (i + 1 < message.length())
&& (message.charAt(i + 1) == '%')) {
formattedMessage.append('%');
i++;
} else {
formattedMessage.append(message.charAt(i));
}
}
}
return formattedMessage.toString();
}
private static int matchOptionalFormatting(
Number number,
String formatting,
StringBuffer outputTo) {
NumberFormat numberFormat = NumberFormat.getInstance();
if ((0 < formatting.length())
&& Character.isDigit(formatting.charAt(0))) {
numberFormat.setMinimumIntegerDigits(
Integer.parseInt(formatting.charAt(0) + ""));
if ((2 < formatting.length())
&& (formatting.charAt(1) == '.')
&& Character.isDigit(formatting.charAt(2))) {
numberFormat.setMaximumFractionDigits(
Integer.parseInt(formatting.charAt(2) + ""));
numberFormat.format(number, outputTo, new FieldPosition(0));
return 3;
}
numberFormat.format(number, outputTo, new FieldPosition(0));
return 1;
} else if (
(0 < formatting.length()) && (formatting.charAt(0) == '.')) {
if ((1 < formatting.length())
&& Character.isDigit(formatting.charAt(1))) {
numberFormat.setMaximumFractionDigits(
Integer.parseInt(formatting.charAt(1) + ""));
numberFormat.format(number, outputTo, new FieldPosition(0));
return 2;
}
}
numberFormat.format(number, outputTo, new FieldPosition(0));
return 1;
}
/**
* @return the encoding we want to use, currently hardcoded to ISO-8859-1
*/
public static String getPreferredEncoding() {
return ENCODING;
}
/**
* check the parameter has multibyte character
*
* @param value string to check
* @return boolean result
* true:string has at least one multibyte character
*/
public static boolean hasMultibyte(String value){
if( value == null )return false;
for(int i = 0 ; i < value.length() ; i++ ){
char c = value.charAt(i);
if(c > 0xFF )return true;
}
return false;
}
/**
* Checks to see if a given String needs to be represented as Unicode
* @param value
* @return true if string needs Unicode to be represented.
*/
public static boolean isUnicodeString(final String value) {
try {
return !value.equals(new String(value.getBytes("ISO-8859-1"), "ISO-8859-1"));
} catch (UnsupportedEncodingException e) {
return true;
}
}
}
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