/
Try.java
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/
Try.java
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package net.ME1312.Galaxi.Library;
/**
* Exception Handler Class<br>
* Remember that use of this class should always make your code shorter — it is not a replacement for native try-catch blocks
*/
public final class Try {
private final Class<? extends Throwable>[] types;
private final boolean suppress;
/**
* Handle all exceptions
*/
public static final Try all = new Try(true);
/**
* Handle no exceptions (api for sneaky throwing)
*/
public static final Try none = new Try(false);
@SuppressWarnings("unchecked")
private Try(boolean suppress) {
this.types = new Class[0];
this.suppress = suppress;
}
/**
* Handle specific exceptions
*
* @param exceptions Exception types to handle
* @return Exception Handler
*/
@SafeVarargs
public static Try expect(Class<? extends Throwable>... exceptions) {
return new Try(exceptions);
}
private Try(Class<? extends Throwable>[] exceptions) {
Util.nullpo((Object) exceptions);
this.types = exceptions;
this.suppress = false;
}
/**
* Run some code
*
* @param code Code to run
* @return true if the code was run successfully (without exceptions)
*/
public boolean run(Runnable code) {
try {
code.run();
return true;
} catch (Throwable e) {
suppress(e);
return false;
}
}
/**
* Run some code
*
* @param code Code to run
* @param err Code to run for handling exceptions
* @return true if the code was run successfully (without exceptions)
*/
public boolean run(Runnable code, java.util.function.Consumer<Throwable> err) {
Util.nullpo(err);
try {
code.run();
return true;
} catch (Throwable e) {
suppress(e);
err.accept(e);
return false;
}
}
/**
* Get a value despite exceptions
*
* @param value Code to run
* @return The return value of that code (or null in the event of an exception)
*/
public <T> T get(Supplier<T> value) {
try {
return value.run();
} catch (Throwable e) {
suppress(e);
return null;
}
}
/**
* Get a value despite exceptions
*
* @param value Code to run
* @param def Default value
* @return The return value of that code (or def in the event of an exception)
*/
public <T> T get(Supplier<T> value, T def) {
try {
return value.run();
} catch (Throwable e) {
suppress(e);
return def;
}
}
/**
* Get a value despite exceptions
*
* @param value Code to run
* @param err Code to run for handling exceptions
* @param def Default value
* @return The return value of that code (or def in the event of an exception)
*/
public <T> T get(Supplier<T> value, java.util.function.Consumer<Throwable> err, T def) {
Util.nullpo(err);
try {
return value.run();
} catch (Throwable e) {
suppress(e);
err.accept(e);
return def;
}
}
/**
* Get a value despite exceptions
*
* @param value Code to run
* @param err Code to run for handling exceptions
* @return The return value of that code (or null in the event of an exception)
*/
public <T> T getOrConsume(Supplier<T> value, java.util.function.Consumer<Throwable> err) {
Util.nullpo(err);
try {
return value.run();
} catch (Throwable e) {
suppress(e);
err.accept(e);
return null;
}
}
/**
* Get a value despite exceptions
*
* @param value Code to run
* @param def Code to run for generating the default value in the event of an exception
* @return The return value of either code block
*/
public <T> T getOrSupply(Supplier<T> value, java.util.function.Supplier<? extends T> def) {
Util.nullpo(def);
try {
return value.run();
} catch (Throwable e) {
suppress(e);
return def.get();
}
}
/**
* Get a value despite exceptions
*
* @param value Code to run
* @param def Code to run for handling exceptions and/or generating the default value in the event of an exception
* @return The return value of either code block
*/
public <T> T getOrFunction(Supplier<T> value, java.util.function.Function<Throwable, ? extends T> def) {
Util.nullpo(def);
try {
return value.run();
} catch (Throwable e) {
suppress(e);
return def.apply(e);
}
}
/**
* Get a value despite exceptions
*
* @param value Code to run
* @param err Code to run for handling exceptions
* @param def Code to run for generating the default value in the event of an exception
* @return The return value of either code block
*/
public <T> T getOrFunction(Supplier<T> value, java.util.function.Consumer<Throwable> err, java.util.function.Supplier<? extends T> def) {
Util.nullpo(err, def);
try {
return value.run();
} catch (Throwable e) {
suppress(e);
err.accept(e);
return def.get();
}
}
/**
* Suppresses an exception that we're handling
*
* @param e Exception
*/
private void suppress(Throwable e) {
for (Class<? extends Throwable> t : types) {
if (t.isInstance(e)) {
return;
}
}
if (suppress) return;
throw throwAnyway(e);
}
private static RuntimeException throwAnyway(Throwable e) {
return Try.<RuntimeException>sneakyThrow(e);
}
@SuppressWarnings("unchecked")
private static <T extends Throwable> T sneakyThrow(Throwable e) throws T {
throw (T) e;
}
/**
* Runnable that could throw an exception
* @see java.lang.Runnable
*/
public interface Runnable {
void run() throws Throwable;
}
/**
* Consumer that could throw an exception
* @see java.util.function.Consumer
*/
public interface Consumer<T> {
void run(T arg) throws Throwable;
}
/**
* Supplier that could throw an exception
* @see java.util.function.Supplier
*/
public interface Supplier<R> {
R run() throws Throwable;
}
/**
* Function that could throw an exception
* @see java.util.function.Function
*/
public interface Function<T, R> {
R run(T arg) throws Throwable;
}
}