//$Id: StringHelper.java 10318 2006-08-23 13:36:35Z [email protected] $
package org.hibernate.util;
import java.util.Iterator;
import java.util.StringTokenizer;
import java.util.ArrayList;
public final class StringHelper {
private static final int ALIAS_TRUNCATE_LENGTH = 10;
public static final String WHITESPACE = " \n\r\f\t";
private StringHelper() { /* static methods only - hide constructor */
}
/*public static boolean containsDigits(String string) {
for ( int i=0; i<string.length(); i++ ) {
if ( Character.isDigit( string.charAt(i) ) ) return true;
}
return false;
}*/
public static int lastIndexOfLetter(String string) {
for ( int i=0; i<string.length(); i++ ) {
char character = string.charAt(i);
if ( !Character.isLetter(character) /*&& !('_'==character)*/ ) return i-1;
}
return string.length()-1;
}
public static String join(String seperator, String[] strings) {
int length = strings.length;
if ( length == 0 ) return "";
StringBuffer buf = new StringBuffer( length * strings[0].length() )
.append( strings[0] );
for ( int i = 1; i < length; i++ ) {
buf.append( seperator ).append( strings[i] );
}
return buf.toString();
}
public static String join(String seperator, Iterator objects) {
StringBuffer buf = new StringBuffer();
if ( objects.hasNext() ) buf.append( objects.next() );
while ( objects.hasNext() ) {
buf.append( seperator ).append( objects.next() );
}
return buf.toString();
}
public static String[] add(String[] x, String sep, String[] y) {
String[] result = new String[x.length];
for ( int i = 0; i < x.length; i++ ) {
result[i] = x[i] + sep + y[i];
}
return result;
}
public static String repeat(String string, int times) {
StringBuffer buf = new StringBuffer( string.length() * times );
for ( int i = 0; i < times; i++ ) buf.append( string );
return buf.toString();
}
public static String replace(String template, String placeholder, String replacement) {
return replace( template, placeholder, replacement, false );
}
public static String[] replace(String templates[], String placeholder, String replacement) {
String[] result = new String[templates.length];
for ( int i =0; i<templates.length; i++ ) {
result[i] = replace( templates[i], placeholder, replacement );;
}
return result;
}
public static String replace(String template, String placeholder, String replacement, boolean wholeWords) {
int loc = template == null ? -1 : template.indexOf( placeholder );
if ( loc < 0 ) {
return template;
}
else {
final boolean actuallyReplace = !wholeWords ||
loc + placeholder.length() == template.length() ||
!Character.isJavaIdentifierPart( template.charAt( loc + placeholder.length() ) );
String actualReplacement = actuallyReplace ? replacement : placeholder;
return new StringBuffer( template.substring( 0, loc ) )
.append( actualReplacement )
.append( replace( template.substring( loc + placeholder.length() ),
placeholder,
replacement,
wholeWords ) ).toString();
}
}
public static String replaceOnce(String template, String placeholder, String replacement) {
int loc = template == null ? -1 : template.indexOf( placeholder );
if ( loc < 0 ) {
return template;
}
else {
return new StringBuffer( template.substring( 0, loc ) )
.append( replacement )
.append( template.substring( loc + placeholder.length() ) )
.toString();
}
}
public static String[] split(String seperators, String list) {
return split( seperators, list, false );
}
public static String[] split(String seperators, String list, boolean include) {
StringTokenizer tokens = new StringTokenizer( list, seperators, include );
String[] result = new String[ tokens.countTokens() ];
int i = 0;
while ( tokens.hasMoreTokens() ) {
result[i++] = tokens.nextToken();
}
return result;
}
public static String unqualify(String qualifiedName) {
int loc = qualifiedName.lastIndexOf(".");
return ( loc < 0 ) ? qualifiedName : qualifiedName.substring( qualifiedName.lastIndexOf(".") + 1 );
}
public static String qualifier(String qualifiedName) {
int loc = qualifiedName.lastIndexOf(".");
return ( loc < 0 ) ? "" : qualifiedName.substring( 0, loc );
}
public static String[] suffix(String[] columns, String suffix) {
if ( suffix == null ) return columns;
String[] qualified = new String[columns.length];
for ( int i = 0; i < columns.length; i++ ) {
qualified[i] = suffix( columns[i], suffix );
}
return qualified;
}
private static String suffix(String name, String suffix) {
return ( suffix == null ) ? name : name + suffix;
}
public static String root(String qualifiedName) {
int loc = qualifiedName.indexOf( "." );
return ( loc < 0 ) ? qualifiedName : qualifiedName.substring( 0, loc );
}
public static String unroot(String qualifiedName) {
int loc = qualifiedName.indexOf( "." );
return ( loc < 0 ) ? qualifiedName : qualifiedName.substring( loc+1, qualifiedName.length() );
}
public static boolean booleanValue(String tfString) {
String trimmed = tfString.trim().toLowerCase();
return trimmed.equals( "true" ) || trimmed.equals( "t" );
}
public static String toString(Object[] array) {
int len = array.length;
if ( len == 0 ) return "";
StringBuffer buf = new StringBuffer( len * 12 );
for ( int i = 0; i < len - 1; i++ ) {
buf.append( array[i] ).append(", ");
}
return buf.append( array[len - 1] ).toString();
}
public static String[] multiply(String string, Iterator placeholders, Iterator replacements) {
String[] result = new String[]{string};
while ( placeholders.hasNext() ) {
result = multiply( result, ( String ) placeholders.next(), ( String[] ) replacements.next() );
}
return result;
}
private static String[] multiply(String[] strings, String placeholder, String[] replacements) {
String[] results = new String[replacements.length * strings.length];
int n = 0;
for ( int i = 0; i < replacements.length; i++ ) {
for ( int j = 0; j < strings.length; j++ ) {
results[n++] = replaceOnce( strings[j], placeholder, replacements[i] );
}
}
return results;
}
public static int countUnquoted(String string, char character) {
if ( '\'' == character ) {
throw new IllegalArgumentException( "Unquoted count of quotes is invalid" );
}
if (string == null)
return 0;
// Impl note: takes advantage of the fact that an escpaed single quote
// embedded within a quote-block can really be handled as two seperate
// quote-blocks for the purposes of this method...
int count = 0;
int stringLength = string.length();
boolean inQuote = false;
for ( int indx = 0; indx < stringLength; indx++ ) {
char c = string.charAt( indx );
if ( inQuote ) {
if ( '\'' == c ) {
inQuote = false;
}
}
else if ( '\'' == c ) {
inQuote = true;
}
else if ( c == character ) {
count++;
}
}
return count;
}
public static int[] locateUnquoted(String string, char character) {
if ( '\'' == character ) {
throw new IllegalArgumentException( "Unquoted count of quotes is invalid" );
}
if (string == null) {
return new int[0];
}
ArrayList locations = new ArrayList( 20 );
// Impl note: takes advantage of the fact that an escpaed single quote
// embedded within a quote-block can really be handled as two seperate
// quote-blocks for the purposes of this method...
int stringLength = string.length();
boolean inQuote = false;
for ( int indx = 0; indx < stringLength; indx++ ) {
char c = string.charAt( indx );
if ( inQuote ) {
if ( '\'' == c ) {
inQuote = false;
}
}
else if ( '\'' == c ) {
inQuote = true;
}
else if ( c == character ) {
locations.add( new Integer( indx ) );
}
}
return ArrayHelper.toIntArray( locations );
}
public static boolean isNotEmpty(String string) {
return string != null && string.length() > 0;
}
public static boolean isEmpty(String string) {
return string == null || string.length() == 0;
}
public static String qualify(String prefix, String name) {
if ( name == null || prefix == null ) {
throw new NullPointerException();
}
return new StringBuffer( prefix.length() + name.length() + 1 )
.append(prefix)
.append('.')
.append(name)
.toString();
}
public static String[] qualify(String prefix, String[] names) {
if ( prefix == null ) return names;
int len = names.length;
String[] qualified = new String[len];
for ( int i = 0; i < len; i++ ) {
qualified[i] = qualify( prefix, names[i] );
}
return qualified;
}
public static int firstIndexOfChar(String sqlString, String string, int startindex) {
int matchAt = -1;
for ( int i = 0; i < string.length(); i++ ) {
int curMatch = sqlString.indexOf( string.charAt( i ), startindex );
if ( curMatch >= 0 ) {
if ( matchAt == -1 ) { // first time we find match!
matchAt = curMatch;
}
else {
matchAt = Math.min( matchAt, curMatch );
}
}
}
return matchAt;
}
public static String truncate(String string, int length) {
if ( string.length() <= length ) {
return string;
}
else {
return string.substring( 0, length );
}
}
public static String generateAlias(String description) {
return generateAliasRoot(description) + '_';
}
/**
* Generate a nice alias for the given class name or collection role
* name and unique integer. Subclasses of Loader do <em>not</em> have
* to use aliases of this form.
* @return an alias of the form <tt>foo1_</tt>
*/
public static String generateAlias(String description, int unique) {
return generateAliasRoot(description) +
Integer.toString(unique) +
'_';
}
/**
* Generates a root alias by truncating the "root name" defined by
* the incoming decription and removing/modifying any non-valid
* alias characters.
*
* @param description The root name from which to generate a root alias.
* @return The generated root alias.
*/
private static String generateAliasRoot(String description) {
String result = truncate( unqualifyEntityName(description), ALIAS_TRUNCATE_LENGTH )
.toLowerCase()
.replace( '/', '_' ) // entityNames may now include slashes for the representations
.replace( '$', '_' ); //classname may be an inner class
result = cleanAlias( result );
if ( Character.isDigit( result.charAt(result.length()-1) ) ) {
return result + "x"; //ick!
}
else {
return result;
}
}
/**
* Clean the generated alias by removing any non-alpha characters from the
* beginning.
*
* @param alias The generated alias to be cleaned.
* @return The cleaned alias, stripped of any leading non-alpha characters.
*/
private static String cleanAlias(String alias) {
char[] chars = alias.toCharArray();
// short cut check...
if ( !Character.isLetter( chars[0] ) ) {
for ( int i = 1; i < chars.length; i++ ) {
// as soon as we encounter our first letter, return the substring
// from that position
if ( Character.isLetter( chars[i] ) ) {
return alias.substring( i );
}
}
}
return alias;
}
public static String unqualifyEntityName(String entityName) {
String result = unqualify(entityName);
int slashPos = result.indexOf( '/' );
if ( slashPos > 0 ) {
result = result.substring( 0, slashPos - 1 );
}
return result;
}
public static String toUpperCase(String str) {
return str==null ? null : str.toUpperCase();
}
public static String toLowerCase(String str) {
return str==null ? null : str.toLowerCase();
}
public static String moveAndToBeginning(String filter) {
if ( filter.trim().length()>0 ){
filter += " and ";
if ( filter.startsWith(" and ") ) filter = filter.substring(4);
}
return filter;
}
}
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