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package graphql;

import java.util.Collection;

import java.util.function.Supplier;

import java.util.regex.Pattern;

import static java.lang.String.format;

@SuppressWarnings("TypeParameterUnusedInFormals")

@Internal

public class Assert {

public static <T> T assertNotNull(T object, Supplier<String> msg) {

if (object != null) {

return object;

}

throw new AssertException(msg.get());

}

public static <T> T assertNotNullWithNPE(T object, Supplier<String> msg) {

if (object != null) {

return object;

}

throw new NullPointerException(msg.get());

}

public static <T> T assertNotNull(T object) {

if (object != null) {

return object;

}

throw new AssertException("Object required to be not null");

}

public static <T> void assertNull(T object, Supplier<String> msg) {

if (object == null) {

return;

}

throw new AssertException(msg.get());

}

public static <T> void assertNull(T object) {

if (object == null) {

return;

}

throw new AssertException("Object required to be null");

}

public static <T> T assertNeverCalled() {

throw new AssertException("Should never been called");

}

public static <T> T assertShouldNeverHappen(String format, Object... args) {

throw new AssertException("Internal error: should never happen: " + format(format, args));

}

public static <T> T assertShouldNeverHappen() {

throw new AssertException("Internal error: should never happen");

}

public static <T> Collection<T> assertNotEmpty(Collection<T> collection) {

if (collection == null || collection.isEmpty()) {

throw new AssertException("collection must be not null and not empty");

}

return collection;

}

public static <T> Collection<T> assertNotEmpty(Collection<T> collection, Supplier<String> msg) {

if (collection == null || collection.isEmpty()) {

throw new AssertException(msg.get());

}

return collection;

}

public static void assertTrue(boolean condition, Supplier<String> msg) {

if (condition) {

return;

}

throw new AssertException(msg.get());

}

public static void assertTrue(boolean condition) {

if (condition) {

return;

}

throw new AssertException("condition expected to be true");

}

public static void assertFalse(boolean condition, Supplier<String> msg) {

if (!condition) {

return;

}

throw new AssertException(msg.get());

}

public static void assertFalse(boolean condition) {

if (!condition) {

return;

}

throw new AssertException("condition expected to be false");

}

private static final String invalidNameErrorMessage = "Name must be non-null, non-empty and match [_A-Za-z][_0-9A-Za-z]* - was '%s'";

private static final Pattern validNamePattern = Pattern.compile("[_A-Za-z][_0-9A-Za-z]*");

/**

* Validates that the Lexical token name matches the current spec.

* currently non null, non empty,

*

* @param name - the name to be validated.

* @return the name if valid, or AssertException if invalid.

*/

public static String assertValidName(String name) {

if (name != null && !name.isEmpty() && validNamePattern.matcher(name).matches()) {

return name;

}

throw new AssertException(String.format(invalidNameErrorMessage, name));

}

}