jfxtras.icalendarfx.VElementBase Maven / Gradle / Ivy
package jfxtras.icalendarfx;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.Arrays;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import jfxtras.icalendarfx.VChild;
import jfxtras.icalendarfx.VElement;
import jfxtras.icalendarfx.VElementBase;
import jfxtras.icalendarfx.components.VComponent;
import jfxtras.icalendarfx.components.VComponentElement;
import jfxtras.icalendarfx.parameters.VParameter;
import jfxtras.icalendarfx.parameters.VParameterElement;
import jfxtras.icalendarfx.properties.VProperty;
import jfxtras.icalendarfx.properties.VPropertyElement;
import jfxtras.icalendarfx.properties.component.recurrence.rrule.RRuleElement;
import jfxtras.icalendarfx.properties.component.recurrence.rrule.RRulePart;
import jfxtras.icalendarfx.utilities.Pair;
/**
* Base class for all VCalendar elements.
*
* Contains a map of all no-arg constructors and related methods to support all calendar elements.
*
* @author David Bal
*
*/
public abstract class VElementBase implements VElement
{
protected static final String BEGIN = "BEGIN:";
protected static final String END = "END:";
/** Parse content line into calendar element.
* If element contains children {@link #parseContent(String)} is invoked recursively to parse child elements also
*
* @param content calendar content string to parse
* @return log of information and error messages
* @throws IllegalArgumentException if calendar content is not valid, such as null
*/
abstract protected List parseContent(String content);
protected static void throwMessageExceptions(List messages, VElement element) throws IllegalArgumentException
{
// keep messages that are labeled as exceptions or produced by parsing itself (not children)
// now throw all messages as errors
String error = messages
.stream()
.filter(m -> ! m.message.startsWith("Unknown"))
// .filter(m -> (m.effect == MessageEffect.THROW_EXCEPTION) || (m.element == element))
.map(m -> m.element.name() + ":" + m.message)
.collect(Collectors.joining(System.lineSeparator()));
if (! error.isEmpty())
{
throw new IllegalArgumentException(error);
}
}
// All no-arg constructors made from calendar element enums
private static final Map, String>, Constructor> NO_ARG_CONSTRUCTORS = makeNoArgConstructorMap();
private static Map, String>, Constructor> makeNoArgConstructorMap()
{
Map, String>, Constructor> map = new HashMap<>();
// Add VComponent elements
VComponentElement[] values0 = VComponentElement.values();
Arrays.stream(values0)
.forEach(v ->
{
Pair, String> key = new Pair<>(VComponent.class, v.toString());
try {
Constructor constructor = v.elementClass().getConstructor();
map.put(key, constructor);
} catch (NoSuchMethodException | SecurityException e) {
e.printStackTrace();
}
});
// Add VProperty elements
VPropertyElement[] values1 = VPropertyElement.values();
Arrays.stream(values1)
.forEach(v ->
{
Pair, String> key = new Pair<>(VProperty.class, v.toString());
try {
Constructor constructor = v.elementClass().getConstructor();
map.put(key, constructor);
} catch (NoSuchMethodException | SecurityException e) {
e.printStackTrace();
}
});
// Add VParameter elements
VParameterElement[] values2 = VParameterElement.values();
Arrays.stream(values2)
.forEach(v ->
{
Pair, String> key = new Pair<>(VParameter.class, v.toString());
try {
Constructor constructor = v.elementClass().getConstructor();
map.put(key, constructor);
} catch (NoSuchMethodException | SecurityException e) {
e.printStackTrace();
}
});
// Add RRULE parts
RRuleElement[] values3 = RRuleElement.values();
Arrays.stream(values3)
.forEach(v ->
{
Pair, String> key = new Pair<>(RRulePart.class, v.toString());
try {
Constructor constructor = v.elementClass().getConstructor();
map.put(key, constructor);
} catch (NoSuchMethodException | SecurityException e) {
e.printStackTrace();
}
});
return map;
}
private static final Set NAMES = NO_ARG_CONSTRUCTORS
.entrySet()
.stream()
.map(e -> e.getKey().getValue())
.collect(Collectors.toSet());
public static VChild newEmptyVElement(Class superclass, String name)
{
try {
if (name == null) return null;
String name2 = (name.startsWith("X-")) ? "X-" : name;
Constructor constructor = NO_ARG_CONSTRUCTORS.get(new Pair<>(superclass, name2));
if (constructor == null) return null;
return (VChild) constructor.newInstance();
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException
| InvocationTargetException e) {
e.printStackTrace();
}
return null;
}
/**
* Creates a new VElement by parsing a String of iCalendar content text
* @param
*
* @param content the text to parse, not null
* @return the parsed DaylightSavingTime
*/
protected static T parse(T element, String valueContent)
{
if (valueContent == null) return null;
boolean isContentValid = element.isContentValid(valueContent);
if (! isContentValid)
{
throw new IllegalArgumentException("Invalid element:" + valueContent);
}
List messages = element.parseContent(valueContent);
throwMessageExceptions(messages, element);
return element;
}
/*
* Checks to make sure BEGIN and END delimeters are present or any other
* requirements met.
*/
protected boolean isContentValid(String valueContent)
{
return true;
// return valueContent != null; // override in subclasses
}
/**
* Return element name from calendar content
* e.g VEVENT, SUMMARY, TZID
*
* Doesn't check if content's valid. Returns null if no valid property name exists.
*
* @param content
* @return element name
*/
protected static String elementName(String content)
{
if (content == null) return null;
int indexOfBegin = content.indexOf(BEGIN);
boolean isMultiline = indexOfBegin != -1;
if (isMultiline)
{
int indexOfLineSeparator = content.indexOf(System.lineSeparator());
if (indexOfLineSeparator == -1) return content.substring(indexOfBegin + BEGIN.length()); // if no line separator assume content is just one line and return all text after begin to end
return content.substring(indexOfBegin + BEGIN.length(), indexOfLineSeparator);
} else
{
int i1 = content.indexOf(':');
i1 = (i1 == -1) ? Integer.MAX_VALUE : i1;
int i2 = content.indexOf(';');
i2 = (i2 == -1) ? Integer.MAX_VALUE : i2;
int i = Math.min(i1,i2);
if (i == Integer.MAX_VALUE)
{
return null;
}
String possibleName = content.substring(0, i).toUpperCase();
boolean isNonStandard = (possibleName.startsWith("X-"));
if (isNonStandard) return possibleName;
boolean isStandard = NAMES.contains(possibleName);
if (isStandard) return possibleName;
return null;
}
}
protected static class Message
{
public Message(VElement element, String message, MessageEffect effect) {
super();
this.element = element;
this.message = message;
this.effect = effect;
}
public VElement element;
public String message;
public MessageEffect effect;
@Override
public String toString() {
return "Message [element=" + element + ", message=" + message + ", effect=" + effect + "]";
}
}
public enum MessageEffect {
MESSAGE_ONLY, THROW_EXCEPTION
}
}
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