75 lines
2.8 KiB
Java
75 lines
2.8 KiB
Java
package envoy.client.util;
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import java.util.*;
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import java.util.stream.*;
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import javafx.scene.Node;
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/**
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* @author Leon Hofmeister
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* @since Envoy Client v0.2-beta
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*/
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public final class ReflectionUtil {
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private ReflectionUtil() {}
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/**
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* Gets all declared variable values of the given instance that have the specified class.
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* <p>
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* (i.e. can get all {@code JComponents} (Swing) or {@code Nodes} (JavaFX) in a GUI class).
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* <p>
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* <b>Important: If you are using a module, you first need to declare <br>
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* "opens {your_package} to envoy.client.util;" in your module-info.java</b>.
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*
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* @param <T> the type of the object
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* @param <R> the type to return
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* @param instance the instance of a given class whose values are to be evaluated
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* @param typeToReturn the type of variable to return
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* @return all variables in the given instance that have the requested type
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* @throws RuntimeException if an exception occurs
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* @since Envoy Client v0.2-beta
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*/
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public static <T, R> Stream<R> getAllDeclaredVariablesOfTypeAsStream(T instance,
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Class<R> typeToReturn) {
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return Arrays.stream(instance.getClass().getDeclaredFields())
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.filter(field -> typeToReturn.isAssignableFrom(field.getType())).map(field -> {
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try {
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field.setAccessible(true);
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return typeToReturn.cast(field.get(instance));
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} catch (IllegalArgumentException | IllegalAccessException e) {
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throw new RuntimeException(e);
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}
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});
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}
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/**
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* Gets all declared variables of the given instance that are children of {@code Node}.
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* <p>
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* <b>Important: If you are using a module, you first need to declare <br>
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* "opens {your_package} to envoy.client.util;" in your module-info.java</b>.
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*
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* @param <T> the type of the instance
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* @param instance the instance of a given class whose values are to be evaluated
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* @return all variables of the given object that have the requested type as {@code Stream}
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* @since Envoy Client v0.2-beta
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*/
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public static <T> Stream<Node> getAllDeclaredNodeVariablesAsStream(T instance) {
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return getAllDeclaredVariablesOfTypeAsStream(instance, Node.class);
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}
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/**
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* Gets all declared variables of the given instance that are children of {@code Node}<br>
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* <p>
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* <b>Important: If you are using a module, you first need to declare <br>
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* "opens {your_package} to envoy.client.util;" in your module-info.java</b>.
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*
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* @param <T> the type of the instance
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* @param instance the instance of a given class whose values are to be evaluated
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* @return all variables of the given object that have the requested type
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* @since Envoy Client v0.2-beta
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*/
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public static <T> List<Node> getAllDeclaredNodeVariables(T instance) {
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return getAllDeclaredNodeVariablesAsStream(instance).collect(Collectors.toList());
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}
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}
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