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iText, a free Java-PDF library
/*
* $Id: Utilities.java 3042 2007-11-29 04:25:24Z xlv $
* $Name: $
*
* Copyright 1999, 2000, 2001, 2002 by Bruno Lowagie.
*
* The contents of this file are subject to the Mozilla Public License Version 1.1
* (the "License"); you may not use this file except in compliance with the License.
* You may obtain a copy of the License at http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the License.
*
* The Original Code is 'iText, a free JAVA-PDF library'.
*
* The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
* the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
* All Rights Reserved.
* Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
* are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
*
* Contributor(s): all the names of the contributors are added in the source code
* where applicable.
*
* Alternatively, the contents of this file may be used under the terms of the
* LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
* provisions of LGPL are applicable instead of those above. If you wish to
* allow use of your version of this file only under the terms of the LGPL
* License and not to allow others to use your version of this file under
* the MPL, indicate your decision by deleting the provisions above and
* replace them with the notice and other provisions required by the LGPL.
* If you do not delete the provisions above, a recipient may use your version
* of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the MPL as stated above or under the terms of the GNU
* Library General Public License as published by the Free Software Foundation;
* either version 2 of the License, or 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 Library general Public License for more
* details.
*
* If you didn't download this code from the following link, you should check if
* you aren't using an obsolete version:
* http://www.lowagie.com/iText/
*/
package com.lowagie.text;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.util.Collections;
import java.util.Hashtable;
import java.util.Properties;
import java.util.Set;
import com.lowagie.text.pdf.PRTokeniser;
/**
* A collection of convenience methods that were present in many different iText
* classes.
*/
public class Utilities {
/**
* Gets the keys of a Hashtable
*
* @param table
* a Hashtable
* @return the keyset of a Hashtable (or an empty set if table is null)
*/
public static Set getKeySet(Hashtable table) {
return (table == null) ? Collections.EMPTY_SET : table.keySet();
}
/**
* Utility method to extend an array.
*
* @param original
* the original array or null
* @param item
* the item to be added to the array
* @return a new array with the item appended
*/
public static Object[][] addToArray(Object original[][], Object item[]) {
if (original == null) {
original = new Object[1][];
original[0] = item;
return original;
} else {
Object original2[][] = new Object[original.length + 1][];
System.arraycopy(original, 0, original2, 0, original.length);
original2[original.length] = item;
return original2;
}
}
/**
* Checks for a true/false value of a key in a Properties object.
* @param attributes
* @param key
* @return a true/false value of a key in a Properties object
*/
public static boolean checkTrueOrFalse(Properties attributes, String key) {
return "true".equalsIgnoreCase(attributes.getProperty(key));
}
/**
* Unescapes an URL. All the "%xx" are replaced by the 'xx' hex char value.
* @param src the url to unescape
* @return the eunescaped value
*/
public static String unEscapeURL(String src) {
StringBuffer bf = new StringBuffer();
char[] s = src.toCharArray();
for (int k = 0; k < s.length; ++k) {
char c = s[k];
if (c == '%') {
if (k + 2 >= s.length) {
bf.append(c);
continue;
}
int a0 = PRTokeniser.getHex((int)s[k + 1]);
int a1 = PRTokeniser.getHex((int)s[k + 2]);
if (a0 < 0 || a1 < 0) {
bf.append(c);
continue;
}
bf.append((char)(a0 * 16 + a1));
k += 2;
}
else
bf.append(c);
}
return bf.toString();
}
/**
* This method makes a valid URL from a given filename.
*
* This method makes the conversion of this library from the JAVA 2 platform
* to a JDK1.1.x-version easier.
*
* @param filename
* a given filename
* @return a valid URL
* @throws MalformedURLException
*/
public static URL toURL(String filename) throws MalformedURLException {
try {
return new URL(filename);
}
catch (Exception e) {
return new File(filename).toURI().toURL();
}
}
/**
* This method is an alternative for the InputStream.skip()
* -method that doesn't seem to work properly for big values of size
* .
*
* @param is
* the InputStream
* @param size
* the number of bytes to skip
* @throws IOException
*/
static public void skip(InputStream is, int size) throws IOException {
long n;
while (size > 0) {
n = is.skip(size);
if (n <= 0)
break;
size -= n;
}
}
}