org.archive.util.ArchiveUtils Maven / Gradle / Ivy
/*
* This file is part of the Heritrix web crawler (crawler.archive.org).
*
* Licensed to the Internet Archive (IA) by one or more individual
* contributors.
*
* The IA licenses this file to You under the Apache License, Version 2.0
* (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.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.archive.util;
import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.EOFException;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.URL;
import java.net.URLConnection;
import java.text.NumberFormat;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.HashSet;
import java.util.Locale;
import java.util.Map;
import java.util.Set;
import java.util.TimeZone;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;
import org.apache.commons.io.IOUtils;
import org.archive.format.gzip.GZIPDecoder;
import org.archive.format.gzip.GZIPFormatException;
/**
* Miscellaneous useful methods.
*
* @author gojomo & others
*/
public class ArchiveUtils {
private static final Logger LOGGER = Logger.getLogger(ArchiveUtils.class.getName());
final public static String VERSION = loadVersion();
/**
* Arc-style date stamp in the format yyyyMMddHHmm and UTC time zone.
*/
private static final ThreadLocal
TIMESTAMP12 = threadLocalDateFormat("yyyyMMddHHmm");;
/**
* Arc-style date stamp in the format yyyyMMddHHmmss and UTC time zone.
*/
private static final ThreadLocal
TIMESTAMP14 = threadLocalDateFormat("yyyyMMddHHmmss");
/**
* Arc-style date stamp in the format yyyyMMddHHmmssSSS and UTC time zone.
*/
private static final ThreadLocal
TIMESTAMP17 = threadLocalDateFormat("yyyyMMddHHmmssSSS");
/**
* Log-style date stamp in the format yyyy-MM-dd'T'HH:mm:ss.SSS'Z'
* UTC time zone is assumed.
*/
private static final ThreadLocal
TIMESTAMP17ISO8601Z = threadLocalDateFormat("yyyy-MM-dd'T'HH:mm:ss.SSS'Z'");
/**
* Log-style date stamp in the format yyyy-MM-dd'T'HH:mm:ss'Z'
* UTC time zone is assumed.
*/
private static final ThreadLocal
TIMESTAMP14ISO8601Z = threadLocalDateFormat("yyyy-MM-dd'T'HH:mm:ss'Z'");
/**
* Default character to use padding strings.
*/
private static final char DEFAULT_PAD_CHAR = ' ';
/** milliseconds in an hour */
private static final int HOUR_IN_MS = 60 * 60 * 1000;
/** milliseconds in a day */
private static final int DAY_IN_MS = 24 * HOUR_IN_MS;
private static ThreadLocal threadLocalDateFormat(final String pattern) {
ThreadLocal tl = new ThreadLocal() {
protected SimpleDateFormat initialValue() {
SimpleDateFormat df = new SimpleDateFormat(pattern, Locale.ENGLISH);
df.setTimeZone(TimeZone.getTimeZone("GMT"));
return df;
}
};
return tl;
}
public static int MAX_INT_CHAR_WIDTH =
Integer.toString(Integer.MAX_VALUE).length();
/**
* Utility function for creating arc-style date stamps
* in the format yyyMMddHHmmssSSS.
* Date stamps are in the UTC time zone
* @return the date stamp
*/
public static String get17DigitDate(){
return TIMESTAMP17.get().format(new Date());
}
protected static long LAST_UNIQUE_NOW17 = 0;
protected static String LAST_TIMESTAMP17 = "";
/**
* Utility function for creating UNIQUE-from-this-class
* arc-style date stamps in the format yyyMMddHHmmssSSS.
* Rather than giving a duplicate datestamp on a
* subsequent call, will increment the milliseconds until a
* unique value is returned.
*
* Date stamps are in the UTC time zone
* @return the date stamp
*/
public synchronized static String getUnique17DigitDate(){
long effectiveNow = System.currentTimeMillis();
effectiveNow = Math.max(effectiveNow, LAST_UNIQUE_NOW17+1);
String candidate = get17DigitDate(effectiveNow);
while(candidate.equals(LAST_TIMESTAMP17)) {
effectiveNow++;
candidate = get17DigitDate(effectiveNow);
}
LAST_UNIQUE_NOW17 = effectiveNow;
LAST_TIMESTAMP17 = candidate;
return candidate;
}
/**
* Utility function for creating arc-style date stamps
* in the format yyyyMMddHHmmss.
* Date stamps are in the UTC time zone
* @return the date stamp
*/
public static String get14DigitDate(){
return TIMESTAMP14.get().format(new Date());
}
protected static long LAST_UNIQUE_NOW14 = 0;
protected static String LAST_TIMESTAMP14 = "";
/**
* Utility function for creating UNIQUE-from-this-class
* arc-style date stamps in the format yyyMMddHHmmss.
* Rather than giving a duplicate datestamp on a
* subsequent call, will increment the seconds until a
* unique value is returned.
*
* Date stamps are in the UTC time zone
* @return the date stamp
*/
public synchronized static String getUnique14DigitDate(){
long effectiveNow = System.currentTimeMillis();
effectiveNow = Math.max(effectiveNow, LAST_UNIQUE_NOW14+1);
String candidate = get14DigitDate(effectiveNow);
while(candidate.equals(LAST_TIMESTAMP14)) {
effectiveNow += 1000;
candidate = get14DigitDate(effectiveNow);
}
LAST_UNIQUE_NOW14 = effectiveNow;
LAST_TIMESTAMP14 = candidate;
return candidate;
}
/**
* Utility function for creating arc-style date stamps
* in the format yyyyMMddHHmm.
* Date stamps are in the UTC time zone
* @return the date stamp
*/
public static String get12DigitDate(){
return TIMESTAMP12.get().format(new Date());
}
/**
* Utility function for creating log timestamps, in
* W3C/ISO8601 format, assuming UTC. Use current time.
*
* Format is yyyy-MM-dd'T'HH:mm:ss.SSS'Z'
*
* @return the date stamp
*/
public static String getLog17Date(){
return TIMESTAMP17ISO8601Z.get().format(new Date());
}
/**
* Utility function for creating log timestamps, in
* W3C/ISO8601 format, assuming UTC.
*
* Format is yyyy-MM-dd'T'HH:mm:ss.SSS'Z'
* @param date Date to format.
*
* @return the date stamp
*/
public static String getLog17Date(long date){
return TIMESTAMP17ISO8601Z.get().format(new Date(date));
}
/**
* Utility function for creating log timestamps, in
* W3C/ISO8601 format, assuming UTC. Use current time.
*
* Format is yyyy-MM-dd'T'HH:mm:ss'Z'
*
* @return the date stamp
*/
public static String getLog14Date(){
return TIMESTAMP14ISO8601Z.get().format(new Date());
}
/**
* Utility function for creating log timestamps, in
* W3C/ISO8601 format, assuming UTC.
*
* Format is yyyy-MM-dd'T'HH:mm:ss'Z'
* @param date long timestamp to format.
*
* @return the date stamp
*/
public static String getLog14Date(long date){
return TIMESTAMP14ISO8601Z.get().format(new Date(date));
}
/**
* Utility function for creating log timestamps, in
* W3C/ISO8601 format, assuming UTC.
*
* Format is yyyy-MM-dd'T'HH:mm:ss'Z'
* @param date Date to format.
*
* @return the date stamp
*/
public static String getLog14Date(Date date){
return TIMESTAMP14ISO8601Z.get().format(date);
}
public static Date parse14DigitISODate(String datetime, Date defaultVal)
{
try {
return TIMESTAMP14ISO8601Z.get().parse(datetime);
} catch (ParseException e) {
return defaultVal;
}
}
/**
* Utility function for creating arc-style date stamps
* in the format yyyyMMddHHmmssSSS.
* Date stamps are in the UTC time zone
*
* @param date milliseconds since epoc
* @return the date stamp
*/
public static String get17DigitDate(long date){
return TIMESTAMP17.get().format(new Date(date));
}
public static String get17DigitDate(Date date){
return TIMESTAMP17.get().format(date);
}
/**
* Utility function for creating arc-style date stamps
* in the format yyyyMMddHHmmss.
* Date stamps are in the UTC time zone
*
* @param date milliseconds since epoc
* @return the date stamp
*/
public static String get14DigitDate(long date){
return TIMESTAMP14.get().format(new Date(date));
}
public static String get14DigitDate(Date d) {
return TIMESTAMP14.get().format(d);
}
/**
* Utility function for creating arc-style date stamps
* in the format yyyyMMddHHmm.
* Date stamps are in the UTC time zone
*
* @param date milliseconds since epoc
* @return the date stamp
*/
public static String get12DigitDate(long date){
return TIMESTAMP12.get().format(new Date(date));
}
public static String get12DigitDate(Date d) {
return TIMESTAMP12.get().format(d);
}
/**
* A version of getDate which returns the default instead of throwing an exception if parsing fails
*/
public static Date getDate(String d, Date defaultDate)
{
if (d == null) {
return defaultDate;
}
try {
return getDate(d);
} catch (ParseException pe) {
return defaultDate;
}
}
/**
* Parses an ARC-style date. If passed String is < 12 characters in length,
* we pad. At a minimum, String should contain a year (>=4 characters).
* Parse will also fail if day or month are incompletely specified. Depends
* on the above getXXDigitDate methods.
* @param d A 4-17 digit date in ARC style (yyyy to
* yyyyMMddHHmmssSSS) formatting.
* @return A Date object representing the passed String.
*/
public static Date getDate(String d) throws ParseException {
Date date = null;
if (d == null) {
throw new IllegalArgumentException("Passed date is null");
}
switch (d.length()) {
case 14:
date = ArchiveUtils.parse14DigitDate(d);
break;
case 17:
date = ArchiveUtils.parse17DigitDate(d);
break;
case 12:
date = ArchiveUtils.parse12DigitDate(d);
break;
case 0:
case 1:
case 2:
case 3:
throw new ParseException("Date string must at least contain a" +
"year: " + d, d.length());
default:
if (!(d.startsWith("19") || d.startsWith("20"))) {
throw new ParseException("Unrecognized century: " + d, 0);
}
if (d.length() < 8 && (d.length() % 2) != 0) {
throw new ParseException("Incomplete month/date: " + d,
d.length());
}
StringBuilder sb = new StringBuilder(d);
while (sb.length() < 8) {
sb.append("01");
}
while (sb.length() < 12) {
sb.append("0");
}
date = ArchiveUtils.parse12DigitDate(sb.toString());
}
return date;
}
final static SimpleDateFormat dateToTimestampFormats[] =
{new SimpleDateFormat("MM/dd/yyyy", Locale.ENGLISH),
new SimpleDateFormat("MM/yyyy", Locale.ENGLISH),
new SimpleDateFormat("yyyy", Locale.ENGLISH)};
/**
* Convert a user-entered date into a timestamp
* @param input
* @return
*/
public static String dateToTimestamp(String input) {
Date date = null;
if (input.isEmpty()) {
return null;
}
for (SimpleDateFormat format : dateToTimestampFormats) {
try {
date = format.parse(input);
break;
} catch (ParseException e) {
continue;
}
}
if (date == null) {
return null;
}
return get14DigitDate(date);
}
/**
* Utility function for parsing arc-style date stamps
* in the format yyyMMddHHmmssSSS.
* Date stamps are in the UTC time zone. The whole string will not be
* parsed, only the first 17 digits.
*
* @param date an arc-style formatted date stamp
* @return the Date corresponding to the date stamp string
* @throws ParseException if the inputstring was malformed
*/
public static Date parse17DigitDate(String date) throws ParseException {
return TIMESTAMP17.get().parse(date);
}
/**
* Utility function for parsing arc-style date stamps
* in the format yyyMMddHHmmss.
* Date stamps are in the UTC time zone. The whole string will not be
* parsed, only the first 14 digits.
*
* @param date an arc-style formatted date stamp
* @return the Date corresponding to the date stamp string
* @throws ParseException if the inputstring was malformed
*/
public static Date parse14DigitDate(String date) throws ParseException{
return TIMESTAMP14.get().parse(date);
}
/**
* Utility function for parsing arc-style date stamps
* in the format yyyMMddHHmm.
* Date stamps are in the UTC time zone. The whole string will not be
* parsed, only the first 12 digits.
*
* @param date an arc-style formatted date stamp
* @return the Date corresponding to the date stamp string
* @throws ParseException if the inputstring was malformed
*/
public static Date parse12DigitDate(String date) throws ParseException{
return TIMESTAMP12.get().parse(date);
}
/**
* @param timestamp A 14-digit timestamp or the suffix for a 14-digit
* timestamp: E.g. '20010909014640' or '20010101' or '1970'.
* @return Seconds since the epoch as a string zero-pre-padded so always
* Integer.MAX_VALUE wide (Makes it so sorting of resultant string works
* properly).
* @throws ParseException
*/
public static String secondsSinceEpoch(String timestamp)
throws ParseException {
return zeroPadInteger((int)
(getSecondsSinceEpoch(timestamp).getTime()/1000));
}
/**
* @param timestamp A 14-digit timestamp or the suffix for a 14-digit
* timestamp: E.g. '20010909014640' or '20010101' or '1970'.
* @return A date.
* @see #secondsSinceEpoch(String)
* @throws ParseException
*/
public static Date getSecondsSinceEpoch(String timestamp)
throws ParseException {
if (timestamp.length() < 14) {
if (timestamp.length() < 10 && (timestamp.length() % 2) == 1) {
throw new IllegalArgumentException("Must have year, " +
"month, date, hour or second granularity: " + timestamp);
}
if (timestamp.length() == 4) {
// Add first month and first date.
timestamp = timestamp + "01010000";
}
if (timestamp.length() == 6) {
// Add a date of the first.
timestamp = timestamp + "010000";
}
if (timestamp.length() < 14) {
timestamp = timestamp +
ArchiveUtils.padTo("", 14 - timestamp.length(), '0');
}
}
return ArchiveUtils.parse14DigitDate(timestamp);
}
/**
* @param i Integer to add prefix of zeros too. If passed
* 2005, will return the String 0000002005. String
* width is the width of Integer.MAX_VALUE as a string (10
* digits).
* @return Padded String version of i.
*/
public static String zeroPadInteger(int i) {
return ArchiveUtils.padTo(Integer.toString(i),
MAX_INT_CHAR_WIDTH, '0');
}
/**
* Convert an int to a String, and pad it to
* pad spaces.
* @param i the int
* @param pad the width to pad to.
* @return String w/ padding.
*/
public static String padTo(final int i, final int pad) {
String n = Integer.toString(i);
return padTo(n, pad);
}
/**
* Pad the given String to pad characters wide
* by pre-pending spaces. s should not be null.
* If s is already wider than pad no change is
* done.
*
* @param s the String to pad
* @param pad the width to pad to.
* @return String w/ padding.
*/
public static String padTo(final String s, final int pad) {
return padTo(s, pad, DEFAULT_PAD_CHAR);
}
/**
* Pad the given String to pad characters wide
* by pre-pending padChar.
*
* s should not be null. If s is
* already wider than pad no change is done.
*
* @param s the String to pad
* @param pad the width to pad to.
* @param padChar The pad character to use.
* @return String w/ padding.
*/
public static String padTo(final String s, final int pad,
final char padChar) {
String result = s;
int l = s.length();
if (l < pad) {
StringBuffer sb = new StringBuffer(pad);
while(l < pad) {
sb.append(padChar);
l++;
}
sb.append(s);
result = sb.toString();
}
return result;
}
/** check that two byte arrays are equal. They may be null.
*
* @param lhs a byte array
* @param rhs another byte array.
* @return true if they are both equal (or both
* null)
*/
public static boolean byteArrayEquals(final byte[] lhs, final byte[] rhs) {
if (lhs == null && rhs != null || lhs != null && rhs == null) {
return false;
}
if (lhs==rhs) {
return true;
}
if (lhs.length != rhs.length) {
return false;
}
for(int i = 0; i
* This involves converting it to the largest unit
* (of B, KiB, MiB, GiB, TiB) for which the amount will be > 1.
*
* Additionally, at least 2 significant digits are always displayed.
*
* Negative numbers will be returned as '0 B'.
*
* @param amount the amount of bytes
* @return A string containing the amount, properly formated.
*/
public static String formatBytesForDisplay(long amount) {
double displayAmount = (double) amount;
int unitPowerOf1024 = 0;
if(amount <= 0){
return "0 B";
}
final String[] units = { " B", " KiB", " MiB", " GiB", " TiB" };
while (displayAmount >= 1024 && unitPowerOf1024 < units.length - 1) {
displayAmount = displayAmount / 1024;
unitPowerOf1024++;
}
int fractionDigits;
if (unitPowerOf1024 == 0 || displayAmount >= 10) {
fractionDigits = 0;
} else {
// ensure at least 2 significant digits (#.#) for small displayValues
fractionDigits = 1;
}
return doubleToString(displayAmount, fractionDigits, fractionDigits)
+ units[unitPowerOf1024];
}
/**
* Convert milliseconds value to a human-readable duration
* @param time
* @return Human readable string version of passed time
*/
public static String formatMillisecondsToConventional(long time) {
return formatMillisecondsToConventional(time,5);
}
/**
* Convert milliseconds value to a human-readable duration of
* mixed units, using units no larger than days. For example,
* "5d12h13m12s113ms" or "19h51m".
*
* @param duration
* @param unitCount how many significant units to show, at most
* for example, a value of 2 would show days+hours or hours+seconds
* but not hours+second+milliseconds
* @return Human readable string version of passed time
*/
public static String formatMillisecondsToConventional(long duration, int unitCount) {
if(unitCount <=0) {
unitCount = 5;
}
if(duration==0) {
return "0ms";
}
StringBuffer sb = new StringBuffer();
if(duration<0) {
sb.append("-");
}
long absTime = Math.abs(duration);
long[] thresholds = {DAY_IN_MS, HOUR_IN_MS, 60000, 1000, 1};
String[] units = {"d","h","m","s","ms"};
for(int i = 0; i < thresholds.length; i++) {
if(absTime >= thresholds[i]) {
sb.append(absTime / thresholds[i] + units[i]);
absTime = absTime % thresholds[i];
unitCount--;
}
if(unitCount==0) {
break;
}
}
return sb.toString();
}
/**
* Copy the raw bytes of a long into a byte array, starting at
* the specified offset.
*
* @param l
* @param array
* @param offset
*/
public static void longIntoByteArray(long l, byte[] array, int offset) {
int i, shift;
for(i = 0, shift = 56; i < 8; i++, shift -= 8)
array[offset+i] = (byte)(0xFF & (l >> shift));
}
public static long byteArrayIntoLong(byte [] bytearray) {
return byteArrayIntoLong(bytearray, 0);
}
/**
* Byte array into long.
* @param bytearray Array to convert to a long.
* @param offset Offset into array at which we start decoding the long.
* @return Long made of the bytes of array beginning at
* offset offset.
* @see #longIntoByteArray(long, byte[], int)
*/
public static long byteArrayIntoLong(byte [] bytearray,
int offset) {
long result = 0;
for (int i = offset; i < 8 /*Bytes in long*/; i++) {
result = (result << 8 /*Bits in byte*/) |
(0xff & (byte)(bytearray[i] & 0xff));
}
return result;
}
/**
* Given a string that may be a plain host or host/path (without
* URI scheme), add an implied http:// if necessary.
*
* @param u string to evaluate
* @return string with http:// added if no scheme already present
*/
public static String addImpliedHttpIfNecessary(String u) {
int colon = u.indexOf(':');
int period = u.indexOf('.');
if (colon == -1 || (period >= 0) && (period < colon)) {
// No scheme present; prepend "http://"
u = "http://" + u;
}
return u;
}
/**
* Verify that the array begins with the prefix.
*
* @param array
* @param prefix
* @return true if array is identical to prefix for the first prefix.length
* positions
*/
public static boolean startsWith(byte[] array, byte[] prefix) {
if(prefix.length>array.length) {
return false;
}
for(int i = 0; i < prefix.length; i++) {
if(array[i]!=prefix[i]) {
return false;
}
}
return true;
}
/**
* Enhance given object's default String display for appearing
* nested in a pretty Map String.
*
* @param obj Object to prettify
* @return prettified String
*/
public static String prettyString(Object obj) {
// these things have to checked and casted unfortunately
if (obj instanceof Object[]) {
return prettyString((Object[]) obj);
} else if (obj instanceof Map) {
return prettyString((Map) obj);
} else {
return "<"+obj+">";
}
}
/**
* Provide a improved String of a Map's entries
*
* @return prettified (in curly brackets) string of Map contents
*/
public static String prettyString(Map map) {
StringBuilder builder = new StringBuilder();
builder.append("{ ");
boolean needsComma = false;
for( Object key : map.keySet()) {
if(needsComma) {
builder.append(", ");
}
builder.append(key);
builder.append(": ");
builder.append(prettyString(map.get(key)));
needsComma = true;
}
builder.append(" }");
return builder.toString();
}
/**
* Provide a slightly-improved String of Object[]
*
* @return prettified (in square brackets) of Object[]
*/
public static String prettyString(Object[] array) {
StringBuilder builder = new StringBuilder();
builder.append("[ ");
boolean needsComma = false;
for (Object o: array) {
if(o==null) continue;
if(needsComma) {
builder.append(", ");
}
builder.append(prettyString(o));
needsComma = true;
}
builder.append(" ]");
return builder.toString();
}
private static String loadVersion() {
InputStream input = ArchiveUtils.class.getResourceAsStream(
"/org/archive/util/version.txt");
if (input == null) {
return "UNKNOWN";
}
BufferedReader br = null;
String version;
try {
br = new BufferedReader(new InputStreamReader(input));
version = br.readLine();
br.readLine();
} catch (IOException e) {
return e.getMessage();
} finally {
closeQuietly(br);
}
version = version.trim();
if (!version.endsWith("SNAPSHOT")) {
return version;
}
input = ArchiveUtils.class.getResourceAsStream("/org/archive/util/timestamp.txt");
if (input == null) {
return version;
}
br = null;
String timestamp;
try {
br = new BufferedReader(new InputStreamReader(input));
timestamp = br.readLine();
} catch (IOException e) {
return version;
} finally {
closeQuietly(br);
}
if (timestamp.startsWith("timestamp=")) {
timestamp = timestamp.substring(10);
}
return version.trim() + "-" + timestamp.trim();
}
public static Set TLDS;
static {
TLDS = new HashSet();
InputStream is = ArchiveUtils.class.getResourceAsStream("tlds-alpha-by-domain.txt");
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(is));
String line;
while((line = reader.readLine())!=null) {
if (line.startsWith("#")) {
continue;
}
TLDS.add(line.trim().toLowerCase());
}
} catch (Exception e) {
LOGGER.log(Level.SEVERE,"TLD list unavailable",e);
} finally {
IOUtils.closeQuietly(is);
}
}
/**
* Return whether the given string represents a known
* top-level-domain (like "com", "org", etc.) per IANA
* as of 20100419
*
* @param dom candidate string
* @return boolean true if recognized as TLD
*/
public static boolean isTld(String dom) {
return TLDS.contains(dom.toLowerCase());
}
public static void closeQuietly(Object input) {
if(input == null || ! (input instanceof Closeable)) {
return;
}
try {
((Closeable)input).close();
} catch (IOException ioe) {
// ignore
}
}
/**
* Perform checks as to whether normal execution should proceed.
*
* If an external interrupt is detected, throw an interrupted exception.
* Used before anything that should not be attempted by a 'zombie' thread
* that the Frontier/Crawl has given up on.
*
* @throws InterruptedException
*/
public static void continueCheck() throws InterruptedException {
if(Thread.interrupted()) {
throw new InterruptedException("interrupt detected");
}
}
/**
* Read stream into buf until EOF or buf full.
*
* @param input
* @param buf
* @throws IOException
*/
public static int readFully(InputStream input, byte[] buf)
throws IOException {
int max = buf.length;
int ofs = 0;
while (ofs < max) {
int l = input.read(buf, ofs, max - ofs);
if (l == 0) {
throw new EOFException();
}
ofs += l;
}
return ofs;
}
/** suffix to recognize gzipped files */
public static final String GZIP_SUFFIX = ".gz";
/**
* Get a BufferedReader on the crawler journal given
*
* TODO: move to a general utils class
*
* @param source File journal
* @return journal buffered reader.
* @throws IOException
*/
public static BufferedReader getBufferedReader(File source) throws IOException {
InputStream is = new BufferedInputStream(new FileInputStream(source));
boolean isGzipped = source.getName().toLowerCase().
endsWith(GZIP_SUFFIX);
if(isGzipped) {
is = new GZIPInputStream(is);
}
return new BufferedReader(new InputStreamReader(is));
}
/**
* Get a BufferedReader on the crawler journal given.
*
* @param source URL journal
* @return journal buffered reader.
* @throws IOException
*/
public static BufferedReader getBufferedReader(URL source) throws IOException {
URLConnection conn = source.openConnection();
boolean isGzipped = conn.getContentType() != null && conn.getContentType().equalsIgnoreCase("application/x-gzip")
|| conn.getContentEncoding() != null && conn.getContentEncoding().equalsIgnoreCase("gzip");
InputStream uis = conn.getInputStream();
return new BufferedReader(isGzipped?
new InputStreamReader(new GZIPInputStream(uis)):
new InputStreamReader(uis));
}
/**
* Gzip passed bytes.
* Use only when bytes is small.
* @param bytes What to gzip.
* @return A gzip member of bytes.
* @throws IOException
*/
public static byte [] gzip(byte [] bytes) throws IOException {
ByteArrayOutputStream baos = new ByteArrayOutputStream();
GZIPOutputStream gzipOS = new GZIPOutputStream(baos);
gzipOS.write(bytes, 0, bytes.length);
gzipOS.close();
return baos.toByteArray();
}
/**
* Tests passed stream is gzip stream by reading in the HEAD.
* Does not mark/reset stream -- so this test actually makes
* stream unopenable within GZIP streams, unless reset.
* @param is An InputStream.
* @return True if compressed stream.
* @throws IOException
*/
public static boolean isGzipped(final InputStream is)
throws IOException {
try {
new GZIPDecoder().parseHeader(is);
return true;
} catch (GZIPFormatException e) {
return false;
}
}
}