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// Metawidget
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library 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 library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
package org.metawidget.util;
import java.lang.reflect.Array;
import java.util.List;
import java.util.regex.Pattern;
import org.metawidget.util.simple.StringUtils;
/**
* Utilities for working with Arrays.
*
* @author Richard Kennard
*/
public final class ArrayUtils {
//
// Public statics
//
public static String toString( Object array ) {
return toString( array, StringUtils.SEPARATOR_COMMA );
}
public static String toString( Object array, String separator ) {
return toString( array, separator, false, false );
}
public static String toString( Object array, String separator, boolean leadingSeparator, boolean trailingSeparator ) {
if ( array == null ) {
return "";
}
if ( !array.getClass().isArray() ) {
throw new UnsupportedOperationException( "Not an array" );
}
Pattern patternSeparator = Pattern.compile( separator, Pattern.LITERAL );
String replacement = "\\\\" + separator;
StringBuilder builder = new StringBuilder();
for ( int loop = 0, length = Array.getLength( array ); loop < length; loop++ ) {
String value = String.valueOf( Array.get( array, loop ) );
// Concatenate the separator
if ( builder.length() > 0 || leadingSeparator ) {
builder.append( separator );
}
// Escape the separator
value = patternSeparator.matcher( value ).replaceAll( replacement );
// Build the string
builder.append( value );
}
if ( trailingSeparator && builder.length() > 0 ) {
builder.append( separator );
}
return builder.toString();
}
public static String[] fromString( String array ) {
return fromString( array, ',' );
}
/**
* @return the parsed array. Never null
*/
public static String[] fromString( String array, char separator ) {
if ( array == null ) {
return EMPTY_STRING_ARRAY;
}
List list = CollectionUtils.fromString( array, separator );
return list.toArray( new String[list.size()] );
}
public static T[] add( T[] array, T... arrayToAdd ) {
if ( array == null ) {
return arrayToAdd;
}
return addAt( array, array.length, arrayToAdd );
}
@SuppressWarnings( "unchecked" )
public static T[] addAt( T[] array, int index, T... arrayToAdd ) {
if ( array == null ) {
return arrayToAdd;
}
if ( arrayToAdd == null ) {
return array;
}
int lengthToAdd = arrayToAdd.length;
if ( lengthToAdd == 0 ) {
return array;
}
int originalLength = array.length;
T[] newArray = (T[]) Array.newInstance( array.getClass().getComponentType(), originalLength + lengthToAdd );
if ( index > 0 ) {
System.arraycopy( array, 0, newArray, 0, index );
}
System.arraycopy( arrayToAdd, 0, newArray, index, lengthToAdd );
if ( index < array.length ) {
System.arraycopy( array, index, newArray, index + lengthToAdd, array.length - index );
}
return newArray;
}
public static boolean contains( T[] array, T contains ) {
return ( indexOf( array, contains ) != -1 );
}
public static int indexOf( T[] array, T contains ) {
if ( array == null ) {
return -1;
}
for ( int index = 0; index < array.length; index++ ) {
Object object = array[index];
if ( object == null ) {
if ( contains == null ) {
return index;
}
} else if ( object.equals( contains ) ) {
return index;
}
}
return -1;
}
@SuppressWarnings( "unchecked" )
public static T[] removeAt( T[] array, int index ) {
T[] newArray = (T[]) Array.newInstance( array.getClass().getComponentType(), array.length - 1 );
if ( index > 0 ) {
System.arraycopy( array, 0, newArray, 0, index );
}
if ( index < array.length - 1 ) {
System.arraycopy( array, index + 1, newArray, index, array.length - ( index + 1 ) );
}
return newArray;
}
//
// Private statics
//
private static final String[] EMPTY_STRING_ARRAY = new String[0];
//
// Private constructor
//
private ArrayUtils() {
// Can never be called
}
}
