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Assert.java
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57 lines (45 loc) · 1.78 KB
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package graphql;
import java.util.Collection;
@Internal
public class Assert {
public static <T> T assertNotNull(T object, String errorMessage) {
if (object != null) return object;
throw new AssertException(errorMessage);
}
public static <T> T assertNotNull(T object) {
if (object != null) return object;
throw new AssertException("Object required to be not null");
}
public static <T> T assertNeverCalled() {
throw new AssertException("Should never been called");
}
public static <T> T assertShouldNeverHappen(String errorMessage) {
throw new AssertException("Internal error: should never happen: " + errorMessage);
}
public static <T> T assertShouldNeverHappen() {
throw new AssertException("Internal error: should never happen");
}
public static <T> Collection<T> assertNotEmpty(Collection<T> c, String errorMessage) {
if (c == null || c.isEmpty()) throw new AssertException(errorMessage);
return c;
}
public static void assertTrue(boolean condition, String errorMessage) {
if (condition) return;
throw new AssertException(errorMessage);
}
private static final String invalidNameErrorMessage = "Name must be non-null, non-empty and match [_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() && name.matches("[_A-Za-z][_0-9A-Za-z]*")) {
return name;
}
throw new AssertException(invalidNameErrorMessage);
}
}