net.sf.hajdbc.util.Preconditions Maven / Gradle / Ivy
package net.sf.hajdbc.util;
import java.util.logging.Logger;
import static java.util.logging.Level.WARNING;
public final class Preconditions {
private Preconditions() {}
// TODO(cpovirk): Standardize parameter names (expression vs. b, reference vs. obj).
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
* @param expression a boolean expression
* @throws IllegalArgumentException if {@code expression} is false
*/
public static void checkArgument(boolean expression) {
if (!expression) {
throw new IllegalArgumentException();
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
* @param expression a boolean expression
* @param errorMessage the exception message to use if the check fails; will be converted to a
* string using {@link String#valueOf(Object)}
* @throws IllegalArgumentException if {@code expression} is false
*/
public static void checkArgument(boolean expression, Object errorMessage) {
if (!expression) {
throw new IllegalArgumentException(String.valueOf(errorMessage));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
* @param expression a boolean expression
* @param errorMessageTemplate a template for the exception message should the check fail. The
* message is formed by replacing each {@code %s} placeholder in the template with an
* argument. These are matched by position - the first {@code %s} gets {@code
* errorMessageArgs[0]}, etc. Unmatched arguments will be appended to the formatted message in
* square braces. Unmatched placeholders will be left as-is.
* @param errorMessageArgs the arguments to be substituted into the message template. Arguments
* are converted to strings using {@link String#valueOf(Object)}.
* @throws IllegalArgumentException if {@code expression} is false
*/
public static void checkArgument(
boolean expression,
String errorMessageTemplate,
Object... errorMessageArgs) {
if (!expression) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, errorMessageArgs));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
* See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(boolean b, String errorMessageTemplate, char p1) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(boolean b, String errorMessageTemplate, int p1) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(boolean b, String errorMessageTemplate, long p1) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(
boolean b, String errorMessageTemplate, Object p1) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(boolean b, String errorMessageTemplate, char p1, char p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(boolean b, String errorMessageTemplate, char p1, int p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(boolean b, String errorMessageTemplate, char p1, long p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(
boolean b, String errorMessageTemplate, char p1, Object p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(boolean b, String errorMessageTemplate, int p1, char p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(boolean b, String errorMessageTemplate, int p1, int p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(boolean b, String errorMessageTemplate, int p1, long p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(
boolean b, String errorMessageTemplate, int p1, Object p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(boolean b, String errorMessageTemplate, long p1, char p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(boolean b, String errorMessageTemplate, long p1, int p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(boolean b, String errorMessageTemplate, long p1, long p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(
boolean b, String errorMessageTemplate, long p1, Object p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(
boolean b, String errorMessageTemplate, Object p1, char p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(
boolean b, String errorMessageTemplate, Object p1, int p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(
boolean b, String errorMessageTemplate, Object p1, long p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(
boolean b, String errorMessageTemplate, Object p1, Object p2) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(
boolean b,
String errorMessageTemplate,
Object p1,
Object p2,
Object p3) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2, p3));
}
}
/**
* Ensures the truth of an expression involving one or more parameters to the calling method.
*
*
See {@link #checkArgument(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkArgument(
boolean b,
String errorMessageTemplate,
Object p1,
Object p2,
Object p3,
Object p4) {
if (!b) {
throw new IllegalArgumentException(lenientFormat(errorMessageTemplate, p1, p2, p3, p4));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
* @param expression a boolean expression
* @throws IllegalStateException if {@code expression} is false
*/
public static void checkState(boolean expression) {
if (!expression) {
throw new IllegalStateException();
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
* @param expression a boolean expression
* @param errorMessage the exception message to use if the check fails; will be converted to a
* string using {@link String#valueOf(Object)}
* @throws IllegalStateException if {@code expression} is false
*/
public static void checkState(boolean expression, Object errorMessage) {
if (!expression) {
throw new IllegalStateException(String.valueOf(errorMessage));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
* @param expression a boolean expression
* @param errorMessageTemplate a template for the exception message should the check fail. The
* message is formed by replacing each {@code %s} placeholder in the template with an
* argument. These are matched by position - the first {@code %s} gets {@code
* errorMessageArgs[0]}, etc. Unmatched arguments will be appended to the formatted message in
* square braces. Unmatched placeholders will be left as-is.
* @param errorMessageArgs the arguments to be substituted into the message template. Arguments
* are converted to strings using {@link String#valueOf(Object)}.
* @throws IllegalStateException if {@code expression} is false
*/
public static void checkState(
boolean expression,
/*
* TODO(cpovirk): Consider removing here, as we've done with the other methods'
* errorMessageTemplate parameters: It it unlikely that callers intend for their string
* template to be null (though we do handle that case gracefully at runtime). I've left this
* one as it is because one of our users has defined a wrapper API around Preconditions,
* declaring a checkState method that accepts a possibly null template. So we'd need to update
* that user first.
*/
String errorMessageTemplate,
Object... errorMessageArgs) {
if (!expression) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, errorMessageArgs));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(boolean b, String errorMessageTemplate, char p1) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(boolean b, String errorMessageTemplate, int p1) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(boolean b, String errorMessageTemplate, long p1) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(boolean b, String errorMessageTemplate, Object p1) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(boolean b, String errorMessageTemplate, char p1, char p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(boolean b, String errorMessageTemplate, char p1, int p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(boolean b, String errorMessageTemplate, char p1, long p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(
boolean b, String errorMessageTemplate, char p1, Object p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(boolean b, String errorMessageTemplate, int p1, char p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(boolean b, String errorMessageTemplate, int p1, int p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(boolean b, String errorMessageTemplate, int p1, long p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(
boolean b, String errorMessageTemplate, int p1, Object p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(boolean b, String errorMessageTemplate, long p1, char p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(boolean b, String errorMessageTemplate, long p1, int p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(boolean b, String errorMessageTemplate, long p1, long p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(
boolean b, String errorMessageTemplate, long p1, Object p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(
boolean b, String errorMessageTemplate, Object p1, char p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(
boolean b, String errorMessageTemplate, Object p1, int p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(
boolean b, String errorMessageTemplate, Object p1, long p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(
boolean b, String errorMessageTemplate, Object p1, Object p2) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(
boolean b,
String errorMessageTemplate,
Object p1,
Object p2,
Object p3) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2, p3));
}
}
/**
* Ensures the truth of an expression involving the state of the calling instance, but not
* involving any parameters to the calling method.
*
*
See {@link #checkState(boolean, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static void checkState(
boolean b,
String errorMessageTemplate,
Object p1,
Object p2,
Object p3,
Object p4) {
if (!b) {
throw new IllegalStateException(lenientFormat(errorMessageTemplate, p1, p2, p3, p4));
}
}
/*
* Preconditions.checkNotNull is *intended* for performing eager null checks on parameters that a
* nullness checker can already "prove" are non-null. That means that the first parameter to
* checkNotNull *should* be annotated to require it to be non-null.
*
* However, for a variety of reasons, Google developers have written a ton of code over the past
* decade that assumes that they can use checkNotNull for non-precondition checks. I had hoped to
* take a principled stand on this, but the amount of such code is simply overwhelming. To avoid
* creating a lot of compile errors that users would not find to be informative, we're giving in
* and allowing callers to pass arguments that a nullness checker believes could be null.
*
* We still encourage people to use requireNonNull over checkNotNull for non-precondition checks.
*/
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* @param reference an object reference
* @return the non-null reference that was validated
* @throws NullPointerException if {@code reference} is null
*/
public static T checkNotNull( T reference) {
if (reference == null) {
throw new NullPointerException();
}
return reference;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* @param reference an object reference
* @param errorMessage the exception message to use if the check fails; will be converted to a
* string using {@link String#valueOf(Object)}
* @return the non-null reference that was validated
* @throws NullPointerException if {@code reference} is null
*/
public static T checkNotNull( T reference, Object errorMessage) {
if (reference == null) {
throw new NullPointerException(String.valueOf(errorMessage));
}
return reference;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* @param reference an object reference
* @param errorMessageTemplate a template for the exception message should the check fail. The
* message is formed by replacing each {@code %s} placeholder in the template with an
* argument. These are matched by position - the first {@code %s} gets {@code
* errorMessageArgs[0]}, etc. Unmatched arguments will be appended to the formatted message in
* square braces. Unmatched placeholders will be left as-is.
* @param errorMessageArgs the arguments to be substituted into the message template. Arguments
* are converted to strings using {@link String#valueOf(Object)}.
* @return the non-null reference that was validated
* @throws NullPointerException if {@code reference} is null
*/
public static T checkNotNull(
T reference,
String errorMessageTemplate,
Object... errorMessageArgs) {
if (reference == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, errorMessageArgs));
}
return reference;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull( T obj, String errorMessageTemplate, char p1) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull( T obj, String errorMessageTemplate, int p1) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull( T obj, String errorMessageTemplate, long p1) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, Object p1) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, char p1, char p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, char p1, int p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, char p1, long p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, char p1, Object p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, int p1, char p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, int p1, int p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, int p1, long p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, int p1, Object p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, long p1, char p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, long p1, int p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, long p1, long p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, long p1, Object p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, Object p1, char p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, Object p1, int p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj, String errorMessageTemplate, Object p1, long p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj,
String errorMessageTemplate,
Object p1,
Object p2) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj,
String errorMessageTemplate,
Object p1,
Object p2,
Object p3) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2, p3));
}
return obj;
}
/**
* Ensures that an object reference passed as a parameter to the calling method is not null.
*
* See {@link #checkNotNull(Object, String, Object...)} for details.
*
* @since 20.0 (varargs overload since 2.0)
*/
public static T checkNotNull(
T obj,
String errorMessageTemplate,
Object p1,
Object p2,
Object p3,
Object p4) {
if (obj == null) {
throw new NullPointerException(lenientFormat(errorMessageTemplate, p1, p2, p3, p4));
}
return obj;
}
/*
* All recent hotspots (as of 2009) *really* like to have the natural code
*
* if (guardExpression) {
* throw new BadException(messageExpression);
* }
*
* refactored so that messageExpression is moved to a separate String-returning method.
*
* if (guardExpression) {
* throw new BadException(badMsg(...));
* }
*
* The alternative natural refactorings into void or Exception-returning methods are much slower.
* This is a big deal - we're talking factors of 2-8 in microbenchmarks, not just 10-20%. (This is
* a hotspot optimizer bug, which should be fixed, but that's a separate, big project).
*
* The coding pattern above is heavily used in java.util, e.g. in ArrayList. There is a
* RangeCheckMicroBenchmark in the JDK that was used to test this.
*
* But the methods in this class want to throw different exceptions, depending on the args, so it
* appears that this pattern is not directly applicable. But we can use the ridiculous, devious
* trick of throwing an exception in the middle of the construction of another exception. Hotspot
* is fine with that.
*/
/**
* Ensures that {@code index} specifies a valid element in an array, list or string of size
* {@code size}. An element index may range from zero, inclusive, to {@code size}, exclusive.
*
* @param index a user-supplied index identifying an element of an array, list or string
* @param size the size of that array, list or string
* @return the value of {@code index}
* @throws IndexOutOfBoundsException if {@code index} is negative or is not less than {@code size}
* @throws IllegalArgumentException if {@code size} is negative
*/
public static int checkElementIndex(int index, int size) {
return checkElementIndex(index, size, "index");
}
/**
* Ensures that {@code index} specifies a valid element in an array, list or string of size
* {@code size}. An element index may range from zero, inclusive, to {@code size}, exclusive.
*
* @param index a user-supplied index identifying an element of an array, list or string
* @param size the size of that array, list or string
* @param desc the text to use to describe this index in an error message
* @return the value of {@code index}
* @throws IndexOutOfBoundsException if {@code index} is negative or is not less than {@code size}
* @throws IllegalArgumentException if {@code size} is negative
*/
public static int checkElementIndex(int index, int size, String desc) {
// Carefully optimized for execution by hotspot (explanatory comment above)
if (index < 0 || index >= size) {
throw new IndexOutOfBoundsException(badElementIndex(index, size, desc));
}
return index;
}
private static String badElementIndex(int index, int size, String desc) {
if (index < 0) {
return lenientFormat("%s (%s) must not be negative", desc, index);
} else if (size < 0) {
throw new IllegalArgumentException("negative size: " + size);
} else { // index >= size
return lenientFormat("%s (%s) must be less than size (%s)", desc, index, size);
}
}
/**
* Ensures that {@code index} specifies a valid position in an array, list or string of
* size {@code size}. A position index may range from zero to {@code size}, inclusive.
*
* @param index a user-supplied index identifying a position in an array, list or string
* @param size the size of that array, list or string
* @return the value of {@code index}
* @throws IndexOutOfBoundsException if {@code index} is negative or is greater than {@code size}
* @throws IllegalArgumentException if {@code size} is negative
*/
public static int checkPositionIndex(int index, int size) {
return checkPositionIndex(index, size, "index");
}
/**
* Ensures that {@code index} specifies a valid position in an array, list or string of
* size {@code size}. A position index may range from zero to {@code size}, inclusive.
*
* @param index a user-supplied index identifying a position in an array, list or string
* @param size the size of that array, list or string
* @param desc the text to use to describe this index in an error message
* @return the value of {@code index}
* @throws IndexOutOfBoundsException if {@code index} is negative or is greater than {@code size}
* @throws IllegalArgumentException if {@code size} is negative
*/
public static int checkPositionIndex(int index, int size, String desc) {
// Carefully optimized for execution by hotspot (explanatory comment above)
if (index < 0 || index > size) {
throw new IndexOutOfBoundsException(badPositionIndex(index, size, desc));
}
return index;
}
private static String badPositionIndex(int index, int size, String desc) {
if (index < 0) {
return lenientFormat("%s (%s) must not be negative", desc, index);
} else if (size < 0) {
throw new IllegalArgumentException("negative size: " + size);
} else { // index > size
return lenientFormat("%s (%s) must not be greater than size (%s)", desc, index, size);
}
}
/**
* Ensures that {@code start} and {@code end} specify valid positions in an array, list or
* string of size {@code size}, and are in order. A position index may range from zero to {@code
* size}, inclusive.
*
* @param start a user-supplied index identifying a starting position in an array, list or string
* @param end a user-supplied index identifying an ending position in an array, list or string
* @param size the size of that array, list or string
* @throws IndexOutOfBoundsException if either index is negative or is greater than {@code size},
* or if {@code end} is less than {@code start}
* @throws IllegalArgumentException if {@code size} is negative
*/
public static void checkPositionIndexes(int start, int end, int size) {
// Carefully optimized for execution by hotspot (explanatory comment above)
if (start < 0 || end < start || end > size) {
throw new IndexOutOfBoundsException(badPositionIndexes(start, end, size));
}
}
private static String badPositionIndexes(int start, int end, int size) {
if (start < 0 || start > size) {
return badPositionIndex(start, size, "start index");
}
if (end < 0 || end > size) {
return badPositionIndex(end, size, "end index");
}
// end < start
return lenientFormat("end index (%s) must not be less than start index (%s)", end, start);
}
public static String lenientFormat(
String template, Object... args) {
template = String.valueOf(template); // null -> "null"
if (args == null) {
args = new Object[] {"(Object[])null"};
} else {
for (int i = 0; i < args.length; i++) {
args[i] = lenientToString(args[i]);
}
}
// start substituting the arguments into the '%s' placeholders
StringBuilder builder = new StringBuilder(template.length() + 16 * args.length);
int templateStart = 0;
int i = 0;
while (i < args.length) {
int placeholderStart = template.indexOf("%s", templateStart);
if (placeholderStart == -1) {
break;
}
builder.append(template, templateStart, placeholderStart);
builder.append(args[i++]);
templateStart = placeholderStart + 2;
}
builder.append(template, templateStart, template.length());
// if we run out of placeholders, append the extra args in square braces
if (i < args.length) {
builder.append(" [");
builder.append(args[i++]);
while (i < args.length) {
builder.append(", ");
builder.append(args[i++]);
}
builder.append(']');
}
return builder.toString();
}
private static String lenientToString( Object o) {
if (o == null) {
return "null";
}
try {
return o.toString();
} catch (Exception e) {
// Default toString() behavior - see Object.toString()
String objectToString =
o.getClass().getName() + '@' + Integer.toHexString(System.identityHashCode(o));
// Logger is created inline with fixed name to avoid forcing Proguard to create another class.
Logger.getLogger("com.google.common.base.Strings")
.log(WARNING, "Exception during lenientFormat for " + objectToString, e);
return "<" + objectToString + " threw " + e.getClass().getName() + ">";
}
}
}