/*
* Copyright (C) 2011 Citrix Systems, Inc. All rights reserved.
*
* 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.cloud.bridge.util;
import java.io.IOException;
import java.io.InputStream;
/**
* @author Kelven, John Zucker
* Provide converters for regexp (case independent tokens)
* Also provide upper case or lower case (default) converters for byte array b[] to hex String
*/
public class StringHelper {
public static final String EMPTY_STRING = "";
private static final char[] hexCharsUpperCase = { '0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F' };
private static final char[] hexCharsLowerCase = { '0','1','2','3','4','5','6','7','8','9','a','b','c','d','e','f' };
/* Convert byte array b[] into an uppercase hex string
*/
public static String toHexStringUpperCase(byte[] b) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < b.length; i++) {
sb.append(hexCharsUpperCase[ (int)(((int)b[i] >> 4) & 0x0f)]);
sb.append(hexCharsUpperCase[ (int)(((int)b[i]) & 0x0f)]);
}
return sb.toString();
}
/* Convert byte array b[] into a lowercase (default) hex string
*/
public static String toHexString(byte[] b) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < b.length; i++) {
sb.append(hexCharsLowerCase[ (int)(((int)b[i] >> 4) & 0x0f)]);
sb.append(hexCharsLowerCase[ (int)(((int)b[i]) & 0x0f)]);
}
return sb.toString();
}
public static String substringInBetween(String name,
String prefix, String delimiter) {
int startPos = 0;
if(prefix != null)
startPos = prefix.length() + 1;
int endPos = name.indexOf(delimiter, startPos);
if(endPos > 0)
return name.substring(startPos, endPos);
return null;
}
public static String stringFromStream(InputStream is) throws IOException {
StringBuffer sb = new StringBuffer();
byte[] b = new byte[4096];
int n;
while((n = is.read(b)) != -1) {
sb.append(new String(b, 0, n));
}
return sb.toString();
}
/**
* Convert the string into a regex to allow easy matching. In both S3 and EC2 regex strings
* are used for matching. We must remember to quote all special regex characters that appear
* in the string.
*/
public static String toRegex(String param)
{
StringBuffer regex = new StringBuffer();
for( int i=0; i < param.length(); i++ )
{
char next = param.charAt( i );
if ('*' == next) regex.append( ".+" ); // -> multi-character match wild card
else if ('?' == next) regex.append( "." ); // -> single-character match wild card
else if ('.' == next) regex.append( "\\." ); // all of these are special regex characters we are quoting
else if ('+' == next) regex.append( "\\+" );
else if ('$' == next) regex.append( "\\$" );
else if ('\\' == next) regex.append( "\\\\" );
else if ('[' == next) regex.append( "\\[" );
else if (']' == next) regex.append( "\\]" );
else if ('{' == next) regex.append( "\\{" );
else if ('}' == next) regex.append( "\\}" );
else if ('(' == next) regex.append( "\\(" );
else if (')' == next) regex.append( "\\)" );
else if ('&' == next) regex.append( "\\&" );
else if ('^' == next) regex.append( "\\^" );
else if ('-' == next) regex.append( "\\-" );
else if ('|' == next) regex.append( "\\|" );
else regex.append( next );
}
return regex.toString();
}
}