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/*
* Hibernate, Relational Persistence for Idiomatic Java
*
* Copyright (c) 2008, Red Hat Middleware LLC or third-party contributors as
* indicated by the @author tags or express copyright attribution
* statements applied by the authors. All third-party contributions are
* distributed under license by Red Hat Middleware LLC.
*
* This copyrighted material is made available to anyone wishing to use, modify,
* copy, or redistribute it subject to the terms and conditions of the GNU
* Lesser General Public License, as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this distribution; if not, write to:
* Free Software Foundation, Inc.
* 51 Franklin Street, Fifth Floor
* Boston, MA 02110-1301 USA
*
*/
package org.hibernate.internal.util;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.BitSet;
import java.util.Iterator;
import java.util.StringTokenizer;
import java.util.UUID;
import org.hibernate.dialect.Dialect;
import org.hibernate.internal.util.collections.ArrayHelper;
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 0 ) {
for ( int i = str.length() - 1 ; i >= 0 ; i-- ) {
char ch = str.charAt( i );
if ( ! Character.isWhitespace( ch ) ) {
return ch;
}
}
}
return '\0';
}
public static char getFirstNonWhitespaceCharacter(String str) {
if ( str != null && str.length() > 0 ) {
for ( int i = 0 ; i < str.length() ; i++ ) {
char ch = str.charAt( i );
if ( ! Character.isWhitespace( ch ) ) {
return ch;
}
}
}
return '\0';
}
public static String replaceOnce(String template, String placeholder, String replacement) {
if ( template == null ) {
return template; // returnign null!
}
int loc = template.indexOf( placeholder );
if ( loc < 0 ) {
return template;
}
else {
return new StringBuilder( 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( loc + 1 );
}
public static String qualifier(String qualifiedName) {
int loc = qualifiedName.lastIndexOf(".");
return ( loc < 0 ) ? "" : qualifiedName.substring( 0, loc );
}
/**
* Collapses a name. Mainly intended for use with classnames, where an example might serve best to explain.
* Imagine you have a class named 'org.hibernate.internal.util.StringHelper'; calling collapse on that
* classname will result in 'o.h.u.StringHelper'.
*
* @param name The name to collapse.
* @return The collapsed name.
*/
public static String collapse(String name) {
if ( name == null ) {
return null;
}
int breakPoint = name.lastIndexOf( '.' );
if ( breakPoint < 0 ) {
return name;
}
return collapseQualifier( name.substring( 0, breakPoint ), true ) + name.substring( breakPoint ); // includes last '.'
}
/**
* Given a qualifier, collapse it.
*
* @param qualifier The qualifier to collapse.
* @param includeDots Should we include the dots in the collapsed form?
*
* @return The collapsed form.
*/
public static String collapseQualifier(String qualifier, boolean includeDots) {
StringTokenizer tokenizer = new StringTokenizer( qualifier, "." );
String collapsed = Character.toString( tokenizer.nextToken().charAt( 0 ) );
while ( tokenizer.hasMoreTokens() ) {
if ( includeDots ) {
collapsed += '.';
}
collapsed += tokenizer.nextToken().charAt( 0 );
}
return collapsed;
}
/**
* Partially unqualifies a qualified name. For example, with a base of 'org.hibernate' the name
* 'org.hibernate.internal.util.StringHelper' would become 'util.StringHelper'.
*
* @param name The (potentially) qualified name.
* @param qualifierBase The qualifier base.
*
* @return The name itself, or the partially unqualified form if it begins with the qualifier base.
*/
public static String partiallyUnqualify(String name, String qualifierBase) {
if ( name == null || ! name.startsWith( qualifierBase ) ) {
return name;
}
return name.substring( qualifierBase.length() + 1 ); // +1 to start after the following '.'
}
/**
* Cross between {@link #collapse} and {@link #partiallyUnqualify}. Functions much like {@link #collapse}
* except that only the qualifierBase is collapsed. For example, with a base of 'org.hibernate' the name
* 'org.hibernate.internal.util.StringHelper' would become 'o.h.util.StringHelper'.
*
* @param name The (potentially) qualified name.
* @param qualifierBase The qualifier base.
*
* @return The name itself if it does not begin with the qualifierBase, or the properly collapsed form otherwise.
*/
public static String collapseQualifierBase(String name, String qualifierBase) {
if ( name == null || ! name.startsWith( qualifierBase ) ) {
return collapse( name );
}
return collapseQualifier( qualifierBase, true ) + name.substring( qualifierBase.length() );
}
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 "";
StringBuilder buf = new StringBuilder( 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( 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 StringBuilder( 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, BitSet keys, int startindex) {
for ( int i = startindex, size = sqlString.length(); i < size; i++ ) {
if ( keys.get( sqlString.charAt( i ) ) ) {
return i;
}
}
return -1;
}
public static int firstIndexOfChar(String sqlString, String string, int startindex) {
BitSet keys = new BitSet();
for ( int i = 0, size = string.length(); i < size; i++ ) {
keys.set( string.charAt( i ) );
}
return firstIndexOfChar( sqlString, keys, startindex );
}
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 not have to use aliases of this form.
*
* @param description The base name (usually an entity-name or collection-role)
* @param unique A uniquing value
*
* @return an alias of the form foo1_
*/
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;
}
/**
* Determine if the given string is quoted (wrapped by '`' characters at beginning and end).
*
* @param name The name to check.
* @return True if the given string starts and ends with '`'; false otherwise.
*/
public static boolean isQuoted(String name) {
return name != null && name.length() != 0 && name.charAt( 0 ) == '`' && name.charAt( name.length() - 1 ) == '`';
}
/**
* Return a representation of the given name ensuring quoting (wrapped with '`' characters). If already wrapped
* return name.
*
* @param name The name to quote.
* @return The quoted version.
*/
public static String quote(String name) {
if ( isEmpty( name ) || isQuoted( name ) ) {
return name;
}
// Convert the JPA2 specific quoting character (double quote) to Hibernate's (back tick)
else if ( name.startsWith( "\"" ) && name.endsWith( "\"" ) ) {
name = name.substring( 1, name.length() - 1 );
}
return new StringBuilder( name.length() + 2 ).append('`').append( name ).append( '`' ).toString();
}
/**
* Return the unquoted version of name (stripping the start and end '`' characters if present).
*
* @param name The name to be unquoted.
* @return The unquoted version.
*/
public static String unquote(String name) {
return isQuoted( name ) ? name.substring( 1, name.length() - 1 ) : name;
}
/**
* Determine if the given name is quoted. It is considered quoted if either:
*
*
starts AND ends with backticks (`)
*
starts with dialect-specified {@link org.hibernate.dialect.Dialect#openQuote() open-quote}
* AND ends with dialect-specified {@link org.hibernate.dialect.Dialect#closeQuote() close-quote}
*
*
* @param name The name to check
* @param dialect The dialect (to determine the "real" quoting chars).
*
* @return True if quoted, false otherwise
*/
public static boolean isQuoted(String name, Dialect dialect) {
return name != null
&&
name.length() != 0
&& (
name.charAt( 0 ) == '`'
&&
name.charAt( name.length() - 1 ) == '`'
||
name.charAt( 0 ) == dialect.openQuote()
&&
name.charAt( name.length() - 1 ) == dialect.closeQuote()
);
}
/**
* Return the unquoted version of name stripping the start and end quote characters.
*
* @param name The name to be unquoted.
* @param dialect The dialect (to determine the "real" quoting chars).
*
* @return The unquoted version.
*/
public static String unquote(String name, Dialect dialect) {
return isQuoted( name, dialect ) ? name.substring( 1, name.length() - 1 ) : name;
}
/**
* Return the unquoted version of name stripping the start and end quote characters.
*
* @param names The names to be unquoted.
* @param dialect The dialect (to determine the "real" quoting chars).
*
* @return The unquoted versions.
*/
public static String[] unquote(String[] names, Dialect dialect) {
if ( names == null ) {
return null;
}
String[] unquoted = new String[ names.length ];
for ( int i = 0; i < names.length; i++ ) {
unquoted[i] = unquote( names[i], dialect );
}
return unquoted;
}
public static final String BATCH_ID_PLACEHOLDER = "$$BATCH_ID_PLACEHOLDER$$";
public static StringBuilder buildBatchFetchRestrictionFragment(
String alias,
String[] columnNames,
Dialect dialect) {
// the general idea here is to just insert a placeholder that we can easily find later...
if ( columnNames.length == 1 ) {
// non-composite key
return new StringBuilder( StringHelper.qualify( alias, columnNames[0] ) )
.append( " in (" ).append( BATCH_ID_PLACEHOLDER ).append( ")" );
}
else {
// composite key - the form to use here depends on what the dialect supports.
if ( dialect.supportsRowValueConstructorSyntaxInInList() ) {
// use : (col1, col2) in ( (?,?), (?,?), ... )
StringBuilder builder = new StringBuilder();
builder.append( "(" );
boolean firstPass = true;
String deliminator = "";
for ( String columnName : columnNames ) {
builder.append( deliminator ).append( StringHelper.qualify( alias, columnName ) );
if ( firstPass ) {
firstPass = false;
deliminator = ",";
}
}
builder.append( ") in (" );
builder.append( BATCH_ID_PLACEHOLDER );
builder.append( ")" );
return builder;
}
else {
// use : ( (col1 = ? and col2 = ?) or (col1 = ? and col2 = ?) or ... )
// unfortunately most of this building needs to be held off until we know
// the exact number of ids :(
return new StringBuilder( "(" ).append( BATCH_ID_PLACEHOLDER ).append( ")" );
}
}
}
public static String expandBatchIdPlaceholder(
String sql,
Serializable[] ids,
String alias,
String[] keyColumnNames,
Dialect dialect) {
if ( keyColumnNames.length == 1 ) {
// non-composite
return StringHelper.replace( sql, BATCH_ID_PLACEHOLDER, repeat( "?", ids.length, "," ) );
}
else {
// composite
if ( dialect.supportsRowValueConstructorSyntaxInInList() ) {
final String tuple = "(" + StringHelper.repeat( "?", keyColumnNames.length, "," );
return StringHelper.replace( sql, BATCH_ID_PLACEHOLDER, repeat( tuple, ids.length, "," ) );
}
else {
final String keyCheck = joinWithQualifier( keyColumnNames, alias, " and " );
return replace( sql, BATCH_ID_PLACEHOLDER, repeat( keyCheck, ids.length, " or " ) );
}
}
}
/**
* Takes a String s and returns a new String[1] with s as the only element.
* If s is null or "", return String[0].
*
* @param s
* @return String[]
*/
public static String[] toArrayElement(String s) {
return ( s == null || s.length() == 0 ) ? new String[0] : new String[] { s };
}
// Oracle restricts identifier lengths to 30. Rather than tie this to
// Dialect, simply restrict randomly-generated constrain names across
// the board.
private static final int MAX_NAME_LENGTH = 30;
public static String randomFixedLengthHex(String prefix) {
int length = MAX_NAME_LENGTH - prefix.length();
String s = UUID.randomUUID().toString();
s = s.replace( "-", "" );
if (s.length() > length) {
s = s.substring( 0, length );
}
return prefix + s;
}
}
