com.openhtmltopdf.util

Class GeneralUtil

java.lang.Object

com.openhtmltopdf.util.GeneralUtil

public class GeneralUtil
extends Object

Description of the Class

Author:

Patrick Wright

Field Summary

Fields

Modifier and Type	Field and Description
static DecimalFormat	PADDED_HASH_FORMAT Used to format an Object's hashcode into a 0-padded 10 char String, e.g.

Constructor Summary

Constructors

Constructor and Description
GeneralUtil()

Method Summary

Modifier and Type	Method and Description
static String	classNameOnly(Object o) Given an Object instance, returns just the classname with no package
static String	classNameOnly(String cname) Given a String classname, returns just the classname with no package
static void	dumpShortException(Exception ex) Dumps an exception to the console, only the last 5 lines of the stack trace.
static String	escapeHTML(String s) Converts any special characters into their corresponding HTML entities , for example < to <.
static URL	getURLFromClasspath(Object obj, String resource)
static StringBuilder	htmlEscapeSpace(String uri)
static String	inputStreamToString(InputStream is) Reads all content from a given InputStream into a String using the default platform encoding.
static boolean	isMacOSX()
static InputStream	openStreamFromClasspath(Object obj, String resource) Description of the Method
static String	paddedHashCode(Object o) Description of the Method
static int	parseIntRelaxed(String s) Parses an integer from a string using less restrictive rules about which characters we won't accept.
static String	trackBack(int cnt) Returns a String tracking the last n method calls, from oldest to most recent.
static void	writeStringToFile(String content, String encoding, String fileName)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

PADDED_HASH_FORMAT

public static final DecimalFormat PADDED_HASH_FORMAT

Used to format an Object's hashcode into a 0-padded 10 char String, e.g. for 24993066 returns "0024993066"

Constructor Detail

GeneralUtil

public GeneralUtil()

Method Detail

openStreamFromClasspath

public static InputStream openStreamFromClasspath(Object obj,
                                                  String resource)

Description of the Method

Parameters:

obj - PARAM

resource - PARAM

Returns:

Returns

getURLFromClasspath

public static URL getURLFromClasspath(Object obj,
                                      String resource)

dumpShortException

public static void dumpShortException(Exception ex)

Dumps an exception to the console, only the last 5 lines of the stack trace.

Parameters:

ex - PARAM

trackBack

public static String trackBack(int cnt)

Returns a String tracking the last n method calls, from oldest to most recent. You can use this as a simple tracing mechanism to find out the calls that got to where you execute the trackBack() call from. Example:

 // called from Box.calcBorders(), line 639
 String tback = GeneralUtil.trackBack(6);
 System.out.println(tback);
 

produces

 Boxing.layoutChildren(ln 204)
 BlockBoxing.layoutContent(ln 81)
 Boxing.layout(ln 72)
 Boxing.layout(ln 133)
 Box.totalLeftPadding(ln 306)
 Box.calcBorders(ln 639)
 

The trackBack() method itself is always excluded from the dump. Note the output may not be useful if HotSpot has been optimizing the code.

Parameters:

cnt - How far back in the call tree to go; if call tree is smaller, will be limited to call tree.

Returns:

see desc

classNameOnly

public static String classNameOnly(Object o)

Given an Object instance, returns just the classname with no package

Parameters:

o - PARAM

Returns:

Returns

classNameOnly

public static String classNameOnly(String cname)

Given a String classname, returns just the classname with no package

Parameters:

cname - PARAM

Returns:

Returns

paddedHashCode

public static String paddedHashCode(Object o)

Description of the Method

Parameters:

o - PARAM

Returns:

Returns

isMacOSX

public static boolean isMacOSX()

htmlEscapeSpace

public static StringBuilder htmlEscapeSpace(String uri)

inputStreamToString

public static String inputStreamToString(InputStream is)
                                  throws IOException

Reads all content from a given InputStream into a String using the default platform encoding.

Parameters:

is - the InputStream to read from. Must already be open, and will NOT be closed by this function. Failing to close this stream after the call will result in a resource leak.

Returns:

String containing contents read from the stream

Throws:

IOException - if the stream could not be read

writeStringToFile

public static void writeStringToFile(String content,
                                     String encoding,
                                     String fileName)
                              throws IOException

Throws:

IOException

parseIntRelaxed

public static int parseIntRelaxed(String s)

Parses an integer from a string using less restrictive rules about which characters we won't accept. This scavenges the supplied string for any numeric character, while dropping all others.

Parameters:

s - The string to parse

Returns:

The number represented by the passed string, or 0 if the string is null, empty, white-space only, contains only non-numeric characters, or simply evaluates to 0 after parsing (e.g. "0")

escapeHTML

public static String escapeHTML(String s)

Converts any special characters into their corresponding HTML entities , for example < to <. This is done using a character by character test, so you may consider other approaches for large documents. Make sure you declare the entities that might appear in this replacement, e.g. the latin-1 entities This method was taken from a code-samples website, written and hosted by Real Gagnon, at http://www.rgagnon.com/javadetails/java-0306.html.

Parameters:

s - The String which may contain characters to escape.

Returns:

The string with the characters as HTML entities.