init submit the source code
This commit is contained in:
YuCheng Hu
parent
759603e883
commit
192ace4f9d
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package com.ossez.annotations;
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@Deprecated
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class ClassWithAnnotation {
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}
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package com.ossez.annotations;
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class ClassWithDeprecatedMethod {
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@Deprecated
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static void deprecatedMethod() {
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}
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}
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package com.ossez.annotations;
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class ClassWithSafeVarargs<T> {
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@SafeVarargs
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final void iterateOverVarargs(T... args) {
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for (T x : args) {
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// do stuff with x
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}
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}
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}
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@ -0,0 +1,9 @@
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package com.ossez.annotations;
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class ClassWithSuppressWarnings {
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@SuppressWarnings("deprecation")
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void useDeprecatedMethod() {
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ClassWithDeprecatedMethod.deprecatedMethod(); // no warning is generated here
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}
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}
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package com.ossez.annotations;
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@FunctionalInterface
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interface IntConsumer {
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void accept(Integer number);
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}
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package com.ossez.annotations;
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import java.lang.annotation.Repeatable;
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@Repeatable(Intervals.class)
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@interface Interval {
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int hour() default 1;
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}
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package com.ossez.annotations;
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public class IntervalUsage {
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@Interval(hour = 17)
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@Interval(hour = 13)
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void doPeriodicCleanup() {
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}
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}
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package com.ossez.annotations;
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@interface Intervals {
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Interval[] value();
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}
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package com.ossez.annotations;
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import java.lang.annotation.*;
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@Inherited
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@Documented
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@Retention(RetentionPolicy.RUNTIME)
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@Target({ElementType.LOCAL_VARIABLE, ElementType.FIELD})
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@interface MyAnnotation {
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}
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package com.ossez.annotations;
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class MyAnnotationTarget {
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// this is OK
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@MyAnnotation
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String someField;
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// @MyAnnotation <- this is invalid usage!
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void doSomething() {
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// this also works
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@MyAnnotation
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String localVariable;
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}
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}
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package com.ossez.annotations;
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interface MyOperation {
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void perform();
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}
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package com.ossez.annotations;
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class MyOperationImpl implements MyOperation {
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@Override
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public void perform() {
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}
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}
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package com.ossez.customannotations;
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import static java.lang.annotation.ElementType.METHOD;
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import static java.lang.annotation.RetentionPolicy.RUNTIME;
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import java.lang.annotation.Retention;
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import java.lang.annotation.Target;
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@Retention(RUNTIME)
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@Target(METHOD)
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public @interface Init {
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}
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package com.ossez.customannotations;
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import static java.lang.annotation.ElementType.FIELD;
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import static java.lang.annotation.RetentionPolicy.RUNTIME;
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import java.lang.annotation.Retention;
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import java.lang.annotation.Target;
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@Retention(RUNTIME)
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@Target({ FIELD })
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public @interface JsonElement {
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public String key() default "";
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}
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package com.ossez.customannotations;
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import static java.lang.annotation.ElementType.TYPE;
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import static java.lang.annotation.RetentionPolicy.RUNTIME;
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import java.lang.annotation.Retention;
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import java.lang.annotation.Target;
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@Retention(RUNTIME)
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@Target(TYPE)
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public @interface JsonSerializable {
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}
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package com.ossez.customannotations;
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public class JsonSerializationException extends RuntimeException {
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private static final long serialVersionUID = 1L;
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public JsonSerializationException(String message) {
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super(message);
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}
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}
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package com.ossez.customannotations;
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import java.lang.reflect.Field;
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import java.lang.reflect.InvocationTargetException;
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import java.lang.reflect.Method;
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import java.util.HashMap;
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import java.util.Map;
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import java.util.Objects;
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import java.util.stream.Collectors;
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public class ObjectToJsonConverter {
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public String convertToJson(Object object) throws JsonSerializationException {
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try {
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checkIfSerializable(object);
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initializeObject(object);
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return getJsonString(object);
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} catch (Exception e) {
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throw new JsonSerializationException(e.getMessage());
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}
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}
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private void checkIfSerializable(Object object) {
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if (Objects.isNull(object)) {
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throw new JsonSerializationException("Can't serialize a null object");
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}
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Class<?> clazz = object.getClass();
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if (!clazz.isAnnotationPresent(JsonSerializable.class)) {
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throw new JsonSerializationException("The class " + clazz.getSimpleName() + " is not annotated with JsonSerializable");
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}
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}
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private void initializeObject(Object object) throws IllegalAccessException, IllegalArgumentException, InvocationTargetException {
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Class<?> clazz = object.getClass();
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for (Method method : clazz.getDeclaredMethods()) {
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if (method.isAnnotationPresent(Init.class)) {
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method.setAccessible(true);
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method.invoke(object);
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}
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}
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}
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private String getJsonString(Object object) throws IllegalArgumentException, IllegalAccessException {
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Class<?> clazz = object.getClass();
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Map<String, String> jsonElementsMap = new HashMap<>();
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for (Field field : clazz.getDeclaredFields()) {
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field.setAccessible(true);
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if (field.isAnnotationPresent(JsonElement.class)) {
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jsonElementsMap.put(getKey(field), (String) field.get(object));
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}
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}
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String jsonString = jsonElementsMap.entrySet()
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.stream()
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.map(entry -> "\"" + entry.getKey() + "\":\"" + entry.getValue() + "\"")
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.collect(Collectors.joining(","));
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return "{" + jsonString + "}";
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}
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private String getKey(Field field) {
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String value = field.getAnnotation(JsonElement.class)
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.key();
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return value.isEmpty() ? field.getName() : value;
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}
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}
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package com.ossez.customannotations;
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@JsonSerializable
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public class Person {
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@JsonElement
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private String firstName;
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@JsonElement
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private String lastName;
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@JsonElement(key = "personAge")
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private String age;
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private String address;
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public Person(String firstName, String lastName) {
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super();
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this.firstName = firstName;
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this.lastName = lastName;
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}
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public Person(String firstName, String lastName, String age) {
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this.firstName = firstName;
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this.lastName = lastName;
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this.age = age;
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}
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@Init
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private void initNames() {
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this.firstName = this.firstName.substring(0, 1)
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.toUpperCase() + this.firstName.substring(1);
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this.lastName = this.lastName.substring(0, 1)
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.toUpperCase() + this.lastName.substring(1);
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}
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public String getFirstName() {
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return firstName;
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}
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public void setFirstName(String firstName) {
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this.firstName = firstName;
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}
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public String getLastName() {
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return lastName;
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}
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public void setLastName(String lastName) {
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this.lastName = lastName;
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}
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public String getAge() {
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return age;
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}
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public void setAge(String age) {
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this.age = age;
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}
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public String getAddress() {
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return address;
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}
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public void setAddress(String address) {
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this.address = address;
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}
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}
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<?xml version="1.0" encoding="UTF-8"?>
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<configuration>
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<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
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<encoder>
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<pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
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</pattern>
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</encoder>
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</appender>
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<root level="INFO">
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<appender-ref ref="STDOUT" />
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</root>
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</configuration>
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@ -0,0 +1,26 @@
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package com.ossez.customannotations;
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import static org.junit.jupiter.api.Assertions.assertEquals;
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import static org.junit.jupiter.api.Assertions.assertThrows;
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import org.junit.jupiter.api.Test;
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public class JsonSerializerUnitTest {
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@Test
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public void givenObjectNotSerializedThenExceptionThrown() throws JsonSerializationException {
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Object object = new Object();
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ObjectToJsonConverter serializer = new ObjectToJsonConverter();
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assertThrows(JsonSerializationException.class, () -> {
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serializer.convertToJson(object);
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});
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}
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@Test
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public void givenObjectSerializedThenTrueReturned() throws JsonSerializationException {
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Person person = new Person("soufiane", "cheouati", "34");
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ObjectToJsonConverter serializer = new ObjectToJsonConverter();
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String jsonString = serializer.convertToJson(person);
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assertEquals("{\"personAge\":\"34\",\"firstName\":\"Soufiane\",\"lastName\":\"Cheouati\"}", jsonString);
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}
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}
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