com.itextpdf.text.Utilities Maven / Gradle / Ivy
/*
* $Id: db5d2076ca1da9887a3e739c66e6749b7e6b1314 $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2016 iText Group NV
* Authors: Bruno Lowagie, Paulo Soares, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* 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 Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text;
import java.io.File;
import java.io.FileInputStream;
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.itextpdf.text.pdf.ByteBuffer;
import com.itextpdf.text.pdf.PRTokeniser;
import com.itextpdf.text.pdf.PdfEncodings;
/**
* A collection of convenience methods that were present in many different iText
* classes.
*/
public class Utilities {
/**
* Gets the keys of a Hashtable.
* Marked as deprecated, not used anywhere anymore.
* @param type for the key
* @param type for the value
* @param table
* a Hashtable
* @return the keyset of a Hashtable (or an empty set if table is null)
*/
@Deprecated
public static Set getKeySet(final Hashtable table) {
return table == null ? Collections.emptySet() : 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[][], final 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(final Properties attributes, final 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 unescaped value
*/
public static String unEscapeURL(final 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(s[k + 1]);
int a1 = PRTokeniser.getHex(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(final 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(final InputStream is, int size) throws IOException {
long n;
while (size > 0) {
n = is.skip(size);
if (n <= 0)
break;
size -= n;
}
}
/**
* Measurement conversion from millimeters to points.
* @param value a value in millimeters
* @return a value in points
* @since 2.1.2
*/
public static final float millimetersToPoints(final float value) {
return inchesToPoints(millimetersToInches(value));
}
/**
* Measurement conversion from millimeters to inches.
* @param value a value in millimeters
* @return a value in inches
* @since 2.1.2
*/
public static final float millimetersToInches(final float value) {
return value / 25.4f;
}
/**
* Measurement conversion from points to millimeters.
* @param value a value in points
* @return a value in millimeters
* @since 2.1.2
*/
public static final float pointsToMillimeters(final float value) {
return inchesToMillimeters(pointsToInches(value));
}
/**
* Measurement conversion from points to inches.
* @param value a value in points
* @return a value in inches
* @since 2.1.2
*/
public static final float pointsToInches(final float value) {
return value / 72f;
}
/**
* Measurement conversion from inches to millimeters.
* @param value a value in inches
* @return a value in millimeters
* @since 2.1.2
*/
public static final float inchesToMillimeters(final float value) {
return value * 25.4f;
}
/**
* Measurement conversion from inches to points.
* @param value a value in inches
* @return a value in points
* @since 2.1.2
*/
public static final float inchesToPoints(final float value) {
return value * 72f;
}
/**
* Check if the value of a character belongs to a certain interval
* that indicates it's the higher part of a surrogate pair.
* @param c the character
* @return true if the character belongs to the interval
* @since 2.1.2
*/
public static boolean isSurrogateHigh(final char c) {
return c >= '\ud800' && c <= '\udbff';
}
/**
* Check if the value of a character belongs to a certain interval
* that indicates it's the lower part of a surrogate pair.
* @param c the character
* @return true if the character belongs to the interval
* @since 2.1.2
*/
public static boolean isSurrogateLow(final char c) {
return c >= '\udc00' && c <= '\udfff';
}
/**
* Checks if two subsequent characters in a String are
* are the higher and the lower character in a surrogate
* pair (and therefore eligible for conversion to a UTF 32 character).
* @param text the String with the high and low surrogate characters
* @param idx the index of the 'high' character in the pair
* @return true if the characters are surrogate pairs
* @since 2.1.2
*/
public static boolean isSurrogatePair(final String text, final int idx) {
if (idx < 0 || idx > text.length() - 2)
return false;
return isSurrogateHigh(text.charAt(idx)) && isSurrogateLow(text.charAt(idx + 1));
}
/**
* Checks if two subsequent characters in a character array are
* are the higher and the lower character in a surrogate
* pair (and therefore eligible for conversion to a UTF 32 character).
* @param text the character array with the high and low surrogate characters
* @param idx the index of the 'high' character in the pair
* @return true if the characters are surrogate pairs
* @since 2.1.2
*/
public static boolean isSurrogatePair(final char[] text, final int idx) {
if (idx < 0 || idx > text.length - 2)
return false;
return isSurrogateHigh(text[idx]) && isSurrogateLow(text[idx + 1]);
}
/**
* Returns the code point of a UTF32 character corresponding with
* a high and a low surrogate value.
* @param highSurrogate the high surrogate value
* @param lowSurrogate the low surrogate value
* @return a code point value
* @since 2.1.2
*/
public static int convertToUtf32(final char highSurrogate, final char lowSurrogate) {
return (highSurrogate - 0xd800) * 0x400 + lowSurrogate - 0xdc00 + 0x10000;
}
/**
* Converts a unicode character in a character array to a UTF 32 code point value.
* @param text a character array that has the unicode character(s)
* @param idx the index of the 'high' character
* @return the code point value
* @since 2.1.2
*/
public static int convertToUtf32(final char[] text, final int idx) {
return (text[idx] - 0xd800) * 0x400 + text[idx + 1] - 0xdc00 + 0x10000;
}
/**
* Converts a unicode character in a String to a UTF32 code point value
* @param text a String that has the unicode character(s)
* @param idx the index of the 'high' character
* @return the codepoint value
* @since 2.1.2
*/
public static int convertToUtf32(final String text, final int idx) {
return (text.charAt(idx) - 0xd800) * 0x400 + text.charAt(idx + 1) - 0xdc00 + 0x10000;
}
/**
* Converts a UTF32 code point value to a String with the corresponding character(s).
* @param codePoint a Unicode value
* @return the corresponding characters in a String
* @since 2.1.2
*/
public static String convertFromUtf32(int codePoint) {
if (codePoint < 0x10000)
return Character.toString((char)codePoint);
codePoint -= 0x10000;
return new String(new char[]{(char)(codePoint / 0x400 + 0xd800), (char)(codePoint % 0x400 + 0xdc00)});
}
/**
* Reads the contents of a file to a String.
* @param path the path to the file
* @return a String with the contents of the file
* @throws IOException
* @since iText 5.0.0
*/
public static String readFileToString(final String path) throws IOException {
return readFileToString(new File(path));
}
/**
* Reads the contents of a file to a String.
* @param file a file
* @return a String with the contents of the file
* @throws IOException if file was not found or could not be read.
* @since iText 5.0.0
*/
public static String readFileToString(final File file) throws IOException {
byte[] jsBytes = new byte[(int) file.length()];
FileInputStream f = new FileInputStream(file);
f.read(jsBytes);
return new String(jsBytes);
}
/**
* Converts an array of bytes to a String of hexadecimal values
* @param bytes a byte array
* @return the same bytes expressed as hexadecimal values
*/
public static String convertToHex(byte[] bytes) {
ByteBuffer buf = new ByteBuffer();
for (byte b : bytes) {
buf.appendHex(b);
}
return PdfEncodings.convertToString(buf.toByteArray(), null).toUpperCase();
}
/**
* Copies the specified range of the specified array into a new array.
* The initial index of the range (from) must lie between zero
* and original.length, inclusive. The value at
* original[from] is placed into the initial element of the copy
* (unless from == original.length or from == to).
* Values from subsequent elements in the original array are placed into
* subsequent elements in the copy. The final index of the range
* (to), which must be greater than or equal to from,
* may be greater than original.length, in which case
* '\\u000' is placed in all elements of the copy whose index is
* greater than or equal to original.length - from. The length
* of the returned array will be to - from.
*
* @param original the array from which a range is to be copied
* @param from the initial index of the range to be copied, inclusive
* @param to the final index of the range to be copied, exclusive.
* (This index may lie outside the array.)
* @return a new array containing the specified range from the original array,
* truncated or padded with null characters to obtain the required length
* @throws ArrayIndexOutOfBoundsException if {@code from < 0}
* or {@code from > original.length}
* @throws IllegalArgumentException if from > to
* @throws NullPointerException if original is null
* @since 1.6
*/
public static char[] copyOfRange(char[] original, int from, int to) {
int newLength = to - from;
if (newLength < 0)
throw new IllegalArgumentException(from + " > " + to);
char[] copy = new char[newLength];
System.arraycopy(original, from, copy, 0,
Math.min(original.length - from, newLength));
return copy;
}
}