gu.sql2java.store.ConditionChecks Maven / Gradle / Ivy
package gu.sql2java.store;
import java.lang.reflect.InvocationTargetException;
import javax.annotation.Nullable;
import com.google.errorprone.annotations.CanIgnoreReturnValue;
/**
* 条件检查工具类
* @author guyadong
*
*/
public class ConditionChecks {
private ConditionChecks() {
}
/**
* 执行表达式,为false时抛出 declareType 异常
* @param 抛出异常类型
* @param b
* @param declareType 异常类型
* @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 X
*/
public static void checkTrue(
boolean b,
Class declareType,
@Nullable String errorMessageTemplate, @Nullable Object... errorMessageArgs) throws X {
if (!b) {
try {
if(declareType == null){
throw new NullPointerException("declareType is null");
}
throw declareType.getConstructor(String.class).newInstance(format(errorMessageTemplate, errorMessageArgs));
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException
| InvocationTargetException | NoSuchMethodException | SecurityException e) {
e.printStackTrace();
}
}
}
/**
* 执行表达式,为false时抛出 declareType 异常
*
* See {@link #checkTrue(boolean, Class, String, Object...)} for details.
* @throws X
*/
public static void checkTrue(
boolean b,
Class declareType,
@Nullable String errorMessageTemplate, @Nullable Object p1) throws X {
if (!b) {
try {
if(declareType == null){
throw new NullPointerException("declareType is null");
}
throw declareType.getConstructor(String.class).newInstance(format(errorMessageTemplate, p1));
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException
| InvocationTargetException | NoSuchMethodException | SecurityException e) {
e.printStackTrace();
}
}
}
/**
* reference为{@code null}时抛出 declareType 异常
* @param 对象类型
* @param 抛出异常类型
* @param reference
* @param declareType 异常类型
* @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 T instance
* @throws X
*/
@CanIgnoreReturnValue
public static T checkNotNull(
T reference,
Class declareType,
@Nullable String errorMessageTemplate, @Nullable Object... errorMessageArgs) throws X {
if (null==reference) {
try {
if(declareType == null){
throw new NullPointerException("declareType is null");
}
throw declareType.getConstructor(String.class).newInstance(format(errorMessageTemplate, errorMessageArgs));
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException
| InvocationTargetException | NoSuchMethodException | SecurityException e) {
e.printStackTrace();
}
}
return reference;
}
/**
* reference为{@code null}时抛出 declareType 异常
*
* See {@link #checkNotNull(Object, Class, String, Object...)} for details.
* @return T instance
* @throws X
*/
@CanIgnoreReturnValue
public static T checkNotNull(
T reference,
Class declareType,
@Nullable String errorMessageTemplate, @Nullable Object p1) throws X {
if (null==reference) {
try {
if(declareType == null){
throw new NullPointerException("declareType is null");
}
throw declareType.getConstructor(String.class).newInstance(format(errorMessageTemplate, p1));
} catch (InstantiationException | IllegalAccessException | IllegalArgumentException
| InvocationTargetException | NoSuchMethodException | SecurityException e) {
e.printStackTrace();
}
}
return reference;
}
/**
* Substitutes each {@code %s} in {@code template} with an argument. These are matched by
* position: the first {@code %s} gets {@code args[0]}, etc. If there are more arguments than
* placeholders, the unmatched arguments will be appended to the end of the formatted message in
* square braces.
*
* @param template a non-null string containing 0 or more {@code %s} placeholders.
* @param args the arguments to be substituted into the message template. Arguments are converted
* to strings using {@link String#valueOf(Object)}. Arguments can be null.
*/
// Note that this is somewhat-improperly used from Verify.java as well.
static String format(String template, @Nullable Object... args) {
template = String.valueOf(template); // null -> "null"
// 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();
}
}