jfxtras.icalendarfx.utilities.ICalendarUtilities Maven / Gradle / Ivy
package jfxtras.icalendarfx.utilities;
import java.util.ArrayList;
import java.util.List;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.function.Consumer;
import java.util.function.Predicate;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import jfxtras.icalendarfx.utilities.Pair;
/**
* Static utility methods used throughout iCalendar
*
* @author David Bal
*
*/
public final class ICalendarUtilities
{
private ICalendarUtilities() { };
public final static String PROPERTY_VALUE_KEY = ":";
/**
* parse property content line into a parameter name/value map
* content line must have the property name stripped off the front
*
* For example, for the content line DTEND;TZID=Etc/GMT:20160306T103000Z
* the propertyLine must be ;TZID=Etc/GMT:20160306T103000Z
*
* @param propertyLine - name-stripped property line
* @return - map where key=parameter names as, value=parameter value
*/
// TODO - CONSIDER USING STREAMTOKENIZER instead
public static List> parseInlineElementsToListPair(String propertyLine)
{
List> parameters = new ArrayList<>();
// find start of parameters (go past property name)
int parameterStart=0;
for (parameterStart = 0; parameterStart < propertyLine.length(); parameterStart++)
{
if ((propertyLine.charAt(parameterStart) == ';') || (propertyLine.charAt(parameterStart) == ':'))
{
break;
} else if (propertyLine.charAt(parameterStart) == '=') // propertyLine doesn't contain the property name, start searching for parameters at beginning
{
parameterStart = -1;
break;
}
}
// make adjustments before processing
char firstCharacter;
if (parameterStart == propertyLine.length())
{ // contains no property name, only value
parameterStart = 0; // reset to front of line because it only contains a value
firstCharacter = ':';
} else if (parameterStart == propertyLine.length()-1)
{ // contains only property name, has no value, return empty value
parameters.add(new Pair<>(PROPERTY_VALUE_KEY, null));
return parameters;
} else if (parameterStart < 0)
{ // doesn't contain the property name, but has parameters
firstCharacter = ';';
parameterStart = 0;
} else if (parameterStart == 0)
{ // has parameter or value at start (first character is a ';' or ':')
firstCharacter = propertyLine.charAt(parameterStart);
parameterStart = 1;
} else
{ // contains a property name and parameters and/or value
firstCharacter = propertyLine.charAt(parameterStart);
parameterStart++;
}
// find parameters
int parameterEnd = parameterStart;
boolean quoteOn = false;
while (parameterEnd < propertyLine.length())
{
final String name;
final String value;
if (firstCharacter == ':')
{ // found property value. It continues to end of the string.
parameterEnd = propertyLine.length();
name = PROPERTY_VALUE_KEY;
value = propertyLine.substring(parameterStart, parameterEnd);
} else if (firstCharacter == ';')
{ // found parameter/value pair.
int equalsPosition = propertyLine.indexOf('=', parameterStart);
int nextSemicolonPosition = propertyLine.indexOf(';', parameterStart);
if ((nextSemicolonPosition> 0) && (nextSemicolonPosition < equalsPosition))
{ // parameter has no value
value = null;
name = propertyLine.substring(parameterStart, nextSemicolonPosition).toUpperCase();
parameterEnd = nextSemicolonPosition;
// System.out.println("parameter no value:" + name);
} else
{
name = propertyLine.substring(parameterStart, equalsPosition).toUpperCase();
for (parameterEnd = equalsPosition+1; parameterEnd < propertyLine.length(); parameterEnd++)
{
if (propertyLine.charAt(parameterEnd) == '\"')
{
quoteOn = ! quoteOn;
}
if (! quoteOn) // can't end while quote is on
{
if ((propertyLine.charAt(parameterEnd) == ';') || (propertyLine.charAt(parameterEnd) == ':'))
{
break;
}
}
}
value = propertyLine.substring(equalsPosition+1, parameterEnd);
// System.out.println("parameter:" + value);
}
} else
{
throw new IllegalArgumentException("Invalid property line:" + propertyLine);
}
parameters.add(new Pair<>(name, value));
if (parameterEnd < propertyLine.length())
{
parameterStart = parameterEnd+1;
firstCharacter = propertyLine.charAt(parameterStart-1);
}
}
return parameters;
}
/**
* Folds lines at character 75 into multiple lines. Follows rules in
* RFC 5545, 3.1 Content Lines, page 9.
* A space is added to the first character of the subsequent lines.
* doesn't break lines at escape characters
*
* @param line - content line
* @return - folded content line
*/
public static CharSequence foldLine(CharSequence line)
{
// first position is 0
final int maxLineLength = 75;
if (line.length() <= maxLineLength)
{
return line;
} else
{
StringBuilder builder = new StringBuilder(line.length()+20);
int leadingSpaceAdjustment = 0;
String leadingSpace = "";
int startIndex = 0;
while (startIndex < line.length())
{
int endIndex = Math.min(startIndex+maxLineLength-leadingSpaceAdjustment, line.length());
if (endIndex < line.length())
{
// ensure escaped characters are not broken up
if (line.charAt(endIndex-1) == '\\')
{
endIndex = endIndex-1;
}
builder.append(leadingSpace + line.subSequence(startIndex, endIndex) + System.lineSeparator());
} else
{
builder.append(leadingSpace + line.subSequence(startIndex, endIndex));
}
startIndex = endIndex;
leadingSpaceAdjustment = 1;
leadingSpace = " ";
}
return builder;
}
}
/**
* Returns index where property name ends - after first ';' or ':'
*/
@Deprecated
public static int getPropertyNameIndex(String propertyLine)
{
if ((propertyLine == null) || (propertyLine.length() == 0))
{
return 0;
}
int propertyNameEnd;
for (propertyNameEnd=0; propertyNameEnd Spliterator takeWhile(
Spliterator splitr, Predicate predicate) {
return new Spliterators.AbstractSpliterator(splitr.estimateSize(), 0) {
boolean stillGoing = true;
@Override public boolean tryAdvance(Consumer consumer) {
if (stillGoing) {
boolean hadNext = splitr.tryAdvance(elem -> {
if (predicate.test(elem)) {
consumer.accept(elem);
} else {
stillGoing = false;
}
});
return hadNext && stillGoing;
}
return false;
}
};
}
public static Stream takeWhile(Stream stream, Predicate predicate) {
return StreamSupport.stream(takeWhile(stream.spliterator(), predicate), false);
}
}
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