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/*
* Copyright 2004-2011 H2 Group.
* Copyright 2011 James Moger.
*
* 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.
*/
package com.iciql.util;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.ArrayList;
/**
* Common string utilities.
*
*/
public class StringUtils {
/**
* Replace all occurrences of the before string with the after string.
*
* @param s
* the string
* @param before
* the old text
* @param after
* the new text
* @return the string with the before string replaced
*/
public static String replaceAll(String s, String before, String after) {
int next = s.indexOf(before);
if (next < 0) {
return s;
}
StringBuilder buff = new StringBuilder(s.length() - before.length() + after.length());
int index = 0;
while (true) {
buff.append(s.substring(index, next)).append(after);
index = next + before.length();
next = s.indexOf(before, index);
if (next < 0) {
buff.append(s.substring(index));
break;
}
}
return buff.toString();
}
/**
* Check if a String is null or empty (the length is null).
*
* @param s
* the string to check
* @return true if it is null or empty
*/
public static boolean isNullOrEmpty(String s) {
return s == null || s.length() == 0;
}
/**
* Convert a string to a Java literal using the correct escape sequences.
* The literal is not enclosed in double quotes. The result can be used in
* properties files or in Java source code.
*
* @param s
* the text to convert
* @return the Java representation
*/
public static String javaEncode(String s) {
int length = s.length();
StringBuilder buff = new StringBuilder(length);
for (int i = 0; i < length; i++) {
char c = s.charAt(i);
switch (c) {
// case '\b':
// // BS backspace
// // not supported in properties files
// buff.append("\\b");
// break;
case '\t':
// HT horizontal tab
buff.append("\\t");
break;
case '\n':
// LF linefeed
buff.append("\\n");
break;
case '\f':
// FF form feed
buff.append("\\f");
break;
case '\r':
// CR carriage return
buff.append("\\r");
break;
case '"':
// double quote
buff.append("\\\"");
break;
case '\\':
// backslash
buff.append("\\\\");
break;
default:
int ch = c & 0xffff;
if (ch >= ' ' && (ch < 0x80)) {
buff.append(c);
// not supported in properties files
// } else if(ch < 0xff) {
// buff.append("\\");
// // make sure it's three characters (0x200 is octal 1000)
// buff.append(Integer.toOctalString(0x200 |
// ch).substring(1));
} else {
buff.append("\\u");
// make sure it's four characters
buff.append(Integer.toHexString(0x10000 | ch).substring(1));
}
}
}
return buff.toString();
}
/**
* Pad a string. This method is used for the SQL function RPAD and LPAD.
*
* @param string
* the original string
* @param n
* the target length
* @param padding
* the padding string
* @param right
* true if the padding should be appended at the end
* @return the padded string
*/
public static String pad(String string, int n, String padding, boolean right) {
if (n < 0) {
n = 0;
}
if (n < string.length()) {
return string.substring(0, n);
} else if (n == string.length()) {
return string;
}
char paddingChar;
if (padding == null || padding.length() == 0) {
paddingChar = ' ';
} else {
paddingChar = padding.charAt(0);
}
StringBuilder buff = new StringBuilder(n);
n -= string.length();
if (right) {
buff.append(string);
}
for (int i = 0; i < n; i++) {
buff.append(paddingChar);
}
if (!right) {
buff.append(string);
}
return buff.toString();
}
/**
* Convert a string to a SQL literal. Null is converted to NULL. The text is
* enclosed in single quotes. If there are any special characters, the
* method STRINGDECODE is used.
*
* @param s
* the text to convert.
* @return the SQL literal
*/
public static String quoteStringSQL(String s) {
if (s == null) {
return "NULL";
}
int length = s.length();
StringBuilder buff = new StringBuilder(length + 2);
buff.append('\'');
for (int i = 0; i < length; i++) {
char c = s.charAt(i);
if (c == '\'') {
buff.append(c);
} else if (c < ' ' || c > 127) {
// need to start from the beginning because maybe there was a \
// that was not quoted
return "STRINGDECODE(" + quoteStringSQL(javaEncode(s)) + ")";
}
buff.append(c);
}
buff.append('\'');
return buff.toString();
}
/**
* Split a string into an array of strings using the given separator. A null
* string will result in a null array, and an empty string in a zero element
* array.
*
* @param s
* the string to split
* @param separatorChar
* the separator character
* @param trim
* whether each element should be trimmed
* @return the array list
*/
public static String[] arraySplit(String s, char separatorChar, boolean trim) {
if (s == null) {
return null;
}
int length = s.length();
if (length == 0) {
return new String[0];
}
ArrayList<String> list = Utils.newArrayList();
StringBuilder buff = new StringBuilder(length);
for (int i = 0; i < length; i++) {
char c = s.charAt(i);
if (c == separatorChar) {
String e = buff.toString();
list.add(trim ? e.trim() : e);
buff.setLength(0);
} else if (c == '\\' && i < length - 1) {
buff.append(s.charAt(++i));
} else {
buff.append(c);
}
}
String e = buff.toString();
list.add(trim ? e.trim() : e);
String[] array = new String[list.size()];
list.toArray(array);
return array;
}
/**
* Calculates the SHA1 of the string.
*
* @param text
* @return sha1 of the string
*/
public static String calculateSHA1(String text) {
try {
byte[] bytes = text.getBytes("iso-8859-1");
return calculateSHA1(bytes);
} catch (UnsupportedEncodingException u) {
throw new RuntimeException(u);
}
}
/**
* Calculates the SHA1 of the byte array.
*
* @param bytes
* @return sha1 of the byte array
*/
public static String calculateSHA1(byte[] bytes) {
try {
MessageDigest md = MessageDigest.getInstance("SHA-1");
md.update(bytes, 0, bytes.length);
byte[] digest = md.digest();
StringBuilder sb = new StringBuilder(digest.length * 2);
for (int i = 0; i < digest.length; i++) {
if (((int) digest[i] & 0xff) < 0x10) {
sb.append('0');
}
sb.append(Integer.toHexString((int) digest[i] & 0xff));
}
return sb.toString();
} catch (NoSuchAlgorithmException t) {
throw new RuntimeException(t);
}
}
/**
* Counts the occurrences of char c in the given string.
*
* @param c
* the character to count
* @param value
* the source string
* @return the count of c in value
*/
public static int count(char c, String value) {
int count = 0;
for (char cv : value.toCharArray()) {
if (cv == c) {
count++;
}
}
return count;
}
/**
* Prepare text for html presentation. Replace sensitive characters with
* html entities.
*
* @param inStr
* @param changeSpace
* @return plain text escaped for html
*/
public static String escapeForHtml(String inStr, boolean changeSpace) {
StringBuffer retStr = new StringBuffer();
int i = 0;
while (i < inStr.length()) {
if (inStr.charAt(i) == '&') {
retStr.append("&");
} else if (inStr.charAt(i) == '<') {
retStr.append("<");
} else if (inStr.charAt(i) == '>') {
retStr.append(">");
} else if (inStr.charAt(i) == '\"') {
retStr.append(""");
} else if (changeSpace && inStr.charAt(i) == ' ') {
retStr.append(" ");
} else if (changeSpace && inStr.charAt(i) == '\t') {
retStr.append(" ");
} else {
retStr.append(inStr.charAt(i));
}
i++;
}
return retStr.toString();
}
/**
* Replaces carriage returns and line feeds with html line breaks.
*
* @param string
* @return plain text with html line breaks
*/
public static String breakLinesForHtml(String string) {
return string.replace("\r\n", "<br/>").replace("\r", "<br/>").replace("\n", "<br/>");
}
/**
* Returns the string content of the specified file.
*
* @param file
* @param lineEnding
* @return the string content of the file
*/
public static String readContent(File file, String lineEnding) {
StringBuilder sb = new StringBuilder();
try {
InputStreamReader is = new InputStreamReader(new FileInputStream(file), Charset.forName("UTF-8"));
BufferedReader reader = new BufferedReader(is);
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line);
if (lineEnding != null) {
sb.append(lineEnding);
}
}
reader.close();
} catch (Throwable t) {
System.err.println("Failed to read content of " + file.getAbsolutePath());
t.printStackTrace();
}
return sb.toString();
}
}
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