Java Reflection類代碼示例

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
@Override
public void dispose() {
    try {
        final Object value = Reflection.getFieldValue(field, fieldOwner);
        if (value instanceof Disposable) {
            ((Disposable) value).dispose();
        } else if (value instanceof Lazy<?>) {
            final Lazy<?> lazy = (Lazy<?>) value;
            if (lazy.isInitialized() && lazy.get() instanceof Disposable) {
                ((Disposable) lazy.get()).dispose();
            }
        }
    } catch (final Exception exception) {
        Exceptions.ignore(exception); // Ignored. Closing the application, invalid objects can occur.
    }
}
 

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
@Override
public void processField(final Field field, final LmlMacro annotation, final Object component,
        final Context context, final ContextInitializer initializer, final ContextDestroyer contextDestroyer) {
    try {
        final Object macroData = Reflection.getFieldValue(field, component);
        final LmlParser parser = interfaceService.get().getParser();
        final FileType fileType = annotation.fileType();
        if (macroData instanceof String) {
            parser.parseTemplate(Gdx.files.getFileHandle((String) macroData, fileType));
        } else if (macroData instanceof String[]) {
            for (final String macroPath : (String[]) macroData) {
                parser.parseTemplate(Gdx.files.getFileHandle(macroPath, fileType));
            }
        } else {
            throw new GdxRuntimeException("Invalid type of LML macro definition in component: " + component
                    + ". String or String[] expected, received: " + macroData + ".");
        }
    } catch (final ReflectionException exception) {
        throw new GdxRuntimeException(
                "Unable to extract macro paths from field: " + field + " of component: " + component + ".",
                exception);
    }
}
 

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
/** Invoked when all skins are loaded. Injects skin assets.
 *
 * @param interfaceService used to retrieve skins.
 * @return {@link OnMessage#REMOVE}. */
@SuppressWarnings("unchecked")
@OnMessage(AutumnMessage.SKINS_LOADED)
public boolean injectFields(final InterfaceService interfaceService) {
    for (final Entry<Pair<String, String>, Array<Pair<Field, Object>>> entry : fieldsToInject) {
        final Skin skin = interfaceService.getParser().getData().getSkin(entry.key.getSecond());
        final String assetId = entry.key.getFirst();
        if (skin == null) {
            throw new ContextInitiationException(
                    "Unable to inject asset: " + assetId + ". Unknown skin ID: " + entry.key.getSecond());
        }
        for (final Pair<Field, Object> injection : entry.value) {
            try {
                Reflection.setFieldValue(injection.getFirst(), injection.getSecond(),
                        skin.get(assetId, injection.getFirst().getType()));
            } catch (final ReflectionException exception) {
                throw new GdxRuntimeException("Unable to inject skin asset: " + assetId + " from skin: " + skin
                        + " to field: " + injection.getFirst() + " of component: " + injection.getSecond(),
                        exception);
            }
        }
    }
    fieldsToInject.clear();
    return OnMessage.REMOVE;
}
 

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
@Override
public void processField(final Field field, final LmlParserSyntax annotation, final Object component,
        final Context context, final ContextInitializer initializer, final ContextDestroyer contextDestroyer) {
    try {
        final Object syntax = Reflection.getFieldValue(field, component);
        if (syntax instanceof LmlSyntax) {
            interfaceService.getParser().setSyntax((LmlSyntax) syntax);
        } else {
            throw new ContextInitiationException(
                    "LmlParserSyntax-annotated fields need to contain an instance of LmlSyntax. Found: " + syntax
                            + " in field: " + field + " of component: " + component);
        }
    } catch (final ReflectionException exception) {
        throw new ContextInitiationException(
                "Unable to extract LML syntax from field: " + field + " of component: " + component, exception);
    }
}
 

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
@SuppressWarnings({ "rawtypes", "unchecked" })
private void injectAssets(final AssetService assetService) {
    try {
        ObjectSet set = (ObjectSet) Reflection.getFieldValue(field, component);
        if (set == null) {
            set = GdxSets.newSet();
        }
        for (final String assetPath : assetPaths) {
            set.add(assetService.get(assetPath, assetType));
        }
        Reflection.setFieldValue(field, component, set);
    } catch (final ReflectionException exception) {
        throw new GdxRuntimeException("Unable to inject set of assets into component: " + component + ".",
                exception);
    }
}
 

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
@SuppressWarnings({ "rawtypes", "unchecked" })
private void injectAssets(final AssetService assetService) {
    try {
        ObjectMap map = (ObjectMap) Reflection.getFieldValue(field, component);
        if (map == null) {
            map = GdxMaps.newObjectMap();
        }
        for (int assetIndex = 0; assetIndex < assetPaths.length; assetIndex++) {
            map.put(assetKeys[assetIndex], assetService.get(assetPaths[assetIndex], assetType));
        }
        Reflection.setFieldValue(field, component, map);
    } catch (final ReflectionException exception) {
        throw new GdxRuntimeException("Unable to inject map of assets into component: " + component + ".",
                exception);
    }
}
 

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
@SuppressWarnings({ "rawtypes", "unchecked" })
private void injectAssets(final AssetService assetService) {
    try {
        Array array = (Array) Reflection.getFieldValue(field, component);
        if (array == null) {
            array = GdxArrays.newArray();
        }
        for (final String assetPath : assetPaths) {
            array.add(assetService.get(assetPath, assetType));
        }
        Reflection.setFieldValue(field, component, array);
    } catch (final ReflectionException exception) {
        throw new GdxRuntimeException("Unable to inject array of assets into component: " + component + ".",
                exception);
    }
}
 

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
private void handleLazyAssetInjection(final Object component, final Field field, final Asset assetData) {
    if (Annotations.isNotVoid(assetData.lazyCollection())) {
        handleLazyAssetCollectionInjection(component, field, assetData);
        return;
    } else if (assetData.value().length != 1) {
        throw new GdxRuntimeException(
                "Lazy wrapper can contain only one asset if lazy collection type is not provided. Found multiple assets in field: "
                        + field + " of component: " + component);
    }
    final String assetPath = assetData.value()[0];
    if (!assetData.loadOnDemand()) {
        load(assetPath, assetData.type());
    }
    try {
        Reflection.setFieldValue(field, component,
                Lazy.providedBy(new AssetProvider(this, assetPath, assetData.type(), assetData.loadOnDemand())));
    } catch (final ReflectionException exception) {
        throw new GdxRuntimeException("Unable to inject lazy asset.", exception);
    }
}
 

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
private void handleRegularAssetInjection(final Object component, final Field field, final Asset assetData) {
    if (assetData.value().length != 1) {
        throw new GdxRuntimeException(
                "Regular fields can store only 1 asset. If the field is a collection, its type is not currently supported: only LibGDX Array, ObjectSet and ObjectMap are permitted. Regular arrays will not be supported. Found multiple assets in field: "
                        + field + " of component: " + component);
    }
    final String assetPath = assetData.value()[0];
    if (assetData.loadOnDemand()) {
        // Loaded immediately.
        @SuppressWarnings("unchecked") final Object asset = finishLoading(assetPath, field.getType());
        try {
            Reflection.setFieldValue(field, component, asset);
        } catch (final ReflectionException exception) {
            throw new GdxRuntimeException("Unable to inject asset loaded on demand.", exception);
        }
    } else {
        load(assetPath, field.getType());
        // Scheduled to be loaded, delayed injection.
        assetInjections.add(new StandardAssetInjection(field, assetPath, component));
    }
}
 

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
@SuppressWarnings({ "rawtypes", "unchecked" })
private void handleMapInjection(final Object component, final Field field, final Asset assetData) {
    if (assetData.loadOnDemand()) {
        final String[] assetPaths = assetData.value();
        final String[] assetKeys = assetData.keys().length == 0 ? assetData.value() : assetData.keys();
        try {
            ObjectMap assets = (ObjectMap) Reflection.getFieldValue(field, component);
            if (assets == null) {
                assets = GdxMaps.newObjectMap();
            }
            for (int assetIndex = 0; assetIndex < assetPaths.length; assetIndex++) {
                assets.put(assetKeys[assetIndex], finishLoading(assetPaths[assetIndex], assetData.type()));
            }
            Reflection.setFieldValue(field, component, assets);
        } catch (final ReflectionException exception) {
            throw new GdxRuntimeException("Unable to inject array of assets into: " + component, exception);
        }
    } else {
        for (final String assetPath : assetData.value()) {
            load(assetPath, assetData.type());
        }
        // Scheduled to be loaded, delayed injection.
        assetInjections.add(new ObjectMapAssetInjection(assetData.value(), assetData.keys(), assetData.type(),
                field, component));
    }
}
 

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
@Override
public void processField(final Field field, final AvailableLocales annotation, final Object component,
        final Context context, final ContextInitializer initializer, final ContextDestroyer contextDestroyer) {
    try {
        final Object locales = Reflection.getFieldValue(field, component);
        if (locales instanceof String[]) {
            final String[] availableLocales = (String[]) locales;
            final LmlParser parser = interfaceService.getParser();

            parser.getData().addArgument(annotation.viewArgumentName(), availableLocales);
            for (final String locale : availableLocales) {
                parser.getData().addActorConsumer(annotation.localeChangeMethodPrefix() + locale,
                        new LocaleChangingAction(localeService, LocaleService.toLocale(locale)));
            }
            return;
        }
        throw new GdxRuntimeException("Invalid field annotated with @AvailableLocales in component " + component
                + ". Expected String[], received: " + locales + ".");
    } catch (final ReflectionException exception) {
        throw new GdxRuntimeException(
                "Unable to read available locales from field: " + field + " of component: " + component + ".",
                exception);
    }
}
 

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
protected <View> void processLmlActorAnnotation(final View view, final Field field) {
    if (Reflection.isAnnotationPresent(field, LmlActor.class)) {
        final LmlActor actorData = Reflection.getAnnotation(field, LmlActor.class);
        String[] actorIds = actorData.value();
        if (actorIds.length == 0) {
            actorIds = new String[] { field.getName() };
        }
        if (Reflection.isExtending(field.getType(), Array.class)) {
            injectArrayOfActors(view, field, actorIds);
        } else if (Reflection.isExtending(field.getType(), ObjectSet.class)) {
            injectSetOfActors(view, field, actorIds);
        } else if (Reflection.isExtending(field.getType(), ObjectMap.class)) {
            injectMapOfActors(view, field, actorIds);
        } else {
            injectSingleActor(view, field, actorIds);
        }
    }
}
 

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
protected <View> void processLmlInjectAnnotation(final View view, final Field field) {
    if (Reflection.isAnnotationPresent(field, LmlInject.class)) {
        try {
            final LmlInject injectionData = Reflection.getAnnotation(field, LmlInject.class);
            final Class<?> injectedValueType = getLmlInjectedValueType(field, injectionData);
            if (LmlParser.class.equals(injectedValueType)) {
                // Injected type equals LmlParser - parser injection was requested:
                Reflection.setFieldValue(field, view, this);
                return;
            }
            Object value = Reflection.getFieldValue(field, view);
            if (value == null || injectionData.newInstance()) {
                value = Reflection.newInstance(injectedValueType);
                Reflection.setFieldValue(field, view, value);
            }
            // Processing field's value annotations:
            processViewFieldAnnotations(value);
        } catch (final ReflectionException exception) {
            throw new GdxRuntimeException(
                    "Unable to inject value of LmlInject-annotated field: " + field + " of view: " + view,
                    exception);
        }
    }
}
 

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
private void mapClassFields(final Class<?> containerClass) {
    if (!Lml.EXTRACT_FIELDS_AS_METHODS) {
        return;
    }
    for (final Field field : ClassReflection.getDeclaredFields(containerClass)) {
        final LmlAction actionData = Reflection.getAnnotation(field, LmlAction.class);
        if (actionData != null) {
            final String[] ids = actionData.value();
            if (ids.length > 0) {
                for (final String actionId : ids) {
                    annotatedFields.put(actionId, field);
                }
            } else {
                annotatedFields.put(field.getName(), field);
            }
        }
    }
}
 

import com.github.czyzby.kiwi.util.gdx.reflection.Reflection; //導入依賴的package包/類
@Override
public void processField(final Field field, final LmlMacro annotation, final Object component,
        final Context context, final ContextInitializer initializer, final ContextDestroyer contextDestroyer) {
    try {
        final Object macroData = Reflection.getFieldValue(field, component);
        final FileType fileType = annotation.fileType();
        if (macroData instanceof String) {
            macros.add(Gdx.files.getFileHandle((String) macroData, fileType));
        } else if (macroData instanceof String[]) {
            for (final String macroPath : (String[]) macroData) {
                macros.add(Gdx.files.getFileHandle(macroPath, fileType));
            }
        } else {
            throw new GdxRuntimeException("Invalid type of LML macro definition in component: " + component
                    + ". String or String[] expected, received: " + macroData + ".");
        }
    } catch (final ReflectionException exception) {
        throw new GdxRuntimeException(
                "Unable to extract macro paths from field: " + field + " of component: " + component + ".",
                exception);
    }
}