86 lines
2.2 KiB
Java
86 lines
2.2 KiB
Java
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StringUtil
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package com.ack.util;
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import java.io.PrintWriter;
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import java.io.StringWriter;
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/**
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* Utilities for handling strings
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*/
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public class StringUtil {
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/**
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* Strips a string of white space
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* @return String with trailing white spaces removed, or null
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* if they are no remaining characters
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* @param value String to be trimmed
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*/
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public static String trim( String value ) {
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if( value != null ) {
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value = value.trim();
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if( value.length() == 0 ) {
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value = null;
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}
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}
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return value;
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}
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/**
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* Replacement utility - substitutes <b>all</b> occurrences of 'src' with 'dest' in the string 'name'
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* @param name the string that the substitution is going to take place on
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* @param src the string that is going to be replaced
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* @param dest the string that is going to be substituted in
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* @return String with the substituted strings
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*/
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public static String substitute( String name, String src, String dest ) {
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if( name == null || src == null || name.length() == 0 ) {
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return name;
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}
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if( dest == null ) {
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dest = "";
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}
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int index = name.indexOf( src );
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if( index == -1 ) {
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return name;
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}
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StringBuffer buf = new StringBuffer();
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int lastIndex = 0;
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while( index != -1 ) {
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buf.append( name.substring( lastIndex, index ) );
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buf.append( dest );
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lastIndex = index + src.length();
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index = name.indexOf( src, lastIndex );
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}
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buf.append( name.substring( lastIndex ) );
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return buf.toString();
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}
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/**
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* Converts an exception into a string
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* @param t the exception to be converted
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* @return String a string representation of the exception
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*/
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public static String exceptionToString( Throwable t ) {
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if( t != null ) {
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StringWriter sw = new StringWriter();
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PrintWriter pw = new PrintWriter( sw );
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pw.println( t.getMessage() );
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pw.println( "\n=====================\n" );
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t.printStackTrace( pw );
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pw.println( "\n=====================\n" );
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pw.close();
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return sw.toString();
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}
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else {
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return "";
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}
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}
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}
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