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An annotation processor for generating type-safe bean mappers
/*
* Copyright MapStruct Authors.
*
* Licensed under the Apache License version 2.0, available at http://www.apache.org/licenses/LICENSE-2.0
*/
package org.mapstruct.ap.internal.util;
import static org.mapstruct.ap.internal.util.Collections.asSet;
import java.util.Arrays;
import java.util.Collection;
import java.util.HashSet;
import java.util.Locale;
import java.util.Set;
/**
* Helper class for dealing with strings.
*
* @author Gunnar Morling
*/
public class Strings {
private static final Set KEYWORDS = asSet(
"abstract",
"continue",
"for",
"new",
"switch",
"assert",
"default",
"goto",
"package",
"synchronized",
"boolean",
"do",
"if",
"private",
"this",
"break",
"double",
"implements",
"protected",
"throw",
"byte",
"else",
"import",
"public",
"throws",
"case",
"enum",
"instanceof",
"return",
"transient",
"catch",
"extends",
"int",
"short",
"try",
"char",
"final",
"interface",
"static",
"void",
"class",
"finally",
"long",
"strictfp",
"volatile",
"const",
"float",
"native",
"super",
"while"
);
private static final char UNDERSCORE = '_';
private Strings() {
}
public static String capitalize(String string) {
return string == null ? null : string.substring( 0, 1 ).toUpperCase( Locale.ROOT ) + string.substring( 1 );
}
public static String decapitalize(String string) {
return string == null ? null : string.substring( 0, 1 ).toLowerCase( Locale.ROOT ) + string.substring( 1 );
}
public static String join(Iterable iterable, String separator) {
return join( iterable, separator, null );
}
public static String join(Iterable iterable, String separator, Extractor extractor) {
StringBuilder sb = new StringBuilder();
boolean isFirst = true;
for ( T object : iterable ) {
if ( !isFirst ) {
sb.append( separator );
}
else {
isFirst = false;
}
sb.append( extractor == null ? object : extractor.apply( object ) );
}
return sb.toString();
}
public static String joinAndCamelize(Iterable iterable) {
StringBuilder sb = new StringBuilder();
boolean isFirst = true;
for ( Object object : iterable ) {
if ( !isFirst ) {
sb.append( capitalize( object.toString() ) );
}
else {
sb.append( object );
isFirst = false;
}
}
return sb.toString();
}
public static boolean isEmpty(String string) {
return string == null || string.isEmpty();
}
public static boolean isNotEmpty(String string) {
return !isEmpty( string );
}
public static String getSafeVariableName(String name, String... existingVariableNames) {
return getSafeVariableName( name, Arrays.asList( existingVariableNames ) );
}
/**
* Returns a variable name which doesn't conflict with the given variable names existing in the same scope and the
* Java keywords.
*
* @param name the name to get a safe version for
* @param existingVariableNames the names of other variables existing in the same scope
*
* @return a variable name based on the given original name, not conflicting with any of the given other names or
* any Java keyword; starting with a lower-case letter
*/
public static String getSafeVariableName(String name, Collection existingVariableNames) {
name = decapitalize( sanitizeIdentifierName( name ) );
name = joinAndCamelize( extractParts( name ) );
Set conflictingNames = new HashSet<>( KEYWORDS );
conflictingNames.addAll( existingVariableNames );
if ( !conflictingNames.contains( name ) ) {
return name;
}
int c = 1;
String separator = Character.isDigit( name.charAt( name.length() - 1 ) ) ? "_" : "";
while ( conflictingNames.contains( name + separator + c ) ) {
c++;
}
return name + separator + c;
}
/**
* @param identifier identifier to sanitize
* @return the identifier without any characters that are not allowed as part of a Java identifier.
*/
public static String sanitizeIdentifierName(String identifier) {
if ( identifier != null && identifier.length() > 0 ) {
int firstNonUnderScoreIndex = 0;
while ( firstNonUnderScoreIndex < identifier.length() &&
identifier.charAt( firstNonUnderScoreIndex ) == UNDERSCORE ) {
firstNonUnderScoreIndex++;
}
if ( firstNonUnderScoreIndex < identifier.length()) {
// If it is not consisted of only underscores
return identifier.substring( firstNonUnderScoreIndex ).replace( "[]", "Array" );
}
return identifier.replace( "[]", "Array" );
}
return identifier;
}
/**
* Returns a stub property name from full class name by stripping away the package and decapitalizing the name
* For example will return {@code fooBar} for {@code com.foo.bar.baz.FooBar} class name
*
* @param fullyQualifiedName fully qualified class name, such as com.foo.bar.baz.FooBar
* @return stup property name, such as fooBar
*/
public static String stubPropertyName(String fullyQualifiedName) {
return Strings.decapitalize( fullyQualifiedName.substring( fullyQualifiedName.lastIndexOf( '.' ) + 1 ) );
}
/**
* It removes the dots from the name and creates an {@link Iterable} from them.
*
* E.q. for the name {@code props.font} it will return an {@link Iterable} containing the {@code props} and
* {@code font}
* @param name the name that needs to be parsed into parts
* @return an {@link Iterable} containing all the parts of the name.
*/
static Iterable extractParts(String name) {
return Arrays.asList( name.split( "\\." ) );
}
public static String getMostSimilarWord(String word, Collection similarWords) {
int minLevenstein = Integer.MAX_VALUE;
String mostSimilarWord = null;
for ( String similarWord : similarWords ) {
int levensteinDistance = levenshteinDistance( similarWord, word );
if ( levensteinDistance < minLevenstein ) {
minLevenstein = levensteinDistance;
mostSimilarWord = similarWord;
}
}
return mostSimilarWord;
}
private static int levenshteinDistance(String s, String t) {
int sLength = s.length() + 1;
int tLength = t.length() + 1;
int[][] distances = new int[tLength][];
for ( int i = 0; i < tLength; i++ ) {
distances[i] = new int[sLength];
}
for ( int i = 0; i < tLength; i++ ) {
distances[i][0] = i;
}
for ( int i = 0; i < sLength; i++ ) {
distances[0][i] = i;
}
for ( int i = 1; i < tLength; i++ ) {
for ( int j = 1; j < sLength; j++ ) {
int cost = s.charAt( j - 1 ) == t.charAt( i - 1 ) ? 0 : 1;
distances[i][j] = Math.min(
Math.min(
distances[i - 1][j] + 1,
distances[i][j - 1] + 1
),
distances[i - 1][j - 1] + cost
);
}
}
return distances[tLength - 1][sLength - 1];
}
}