diff options
Diffstat (limited to 'third_party/sl4a/src/main/java/com/google/android/mobly/snippet/rpc/MethodDescriptor.java')
| -rw-r--r-- | third_party/sl4a/src/main/java/com/google/android/mobly/snippet/rpc/MethodDescriptor.java | 162 |
1 files changed, 157 insertions, 5 deletions
diff --git a/third_party/sl4a/src/main/java/com/google/android/mobly/snippet/rpc/MethodDescriptor.java b/third_party/sl4a/src/main/java/com/google/android/mobly/snippet/rpc/MethodDescriptor.java index b9c8a7a..214ffe7 100644 --- a/third_party/sl4a/src/main/java/com/google/android/mobly/snippet/rpc/MethodDescriptor.java +++ b/third_party/sl4a/src/main/java/com/google/android/mobly/snippet/rpc/MethodDescriptor.java @@ -22,18 +22,25 @@ import com.google.android.mobly.snippet.Snippet; import com.google.android.mobly.snippet.manager.SnippetManager; import com.google.android.mobly.snippet.manager.SnippetObjectConverterManager; import com.google.android.mobly.snippet.util.AndroidUtil; +import java.lang.annotation.Annotation; +import java.lang.reflect.Constructor; import java.lang.reflect.Method; import java.lang.reflect.Type; import java.util.ArrayList; +import java.util.Arrays; import java.util.Collection; +import java.util.HashMap; import java.util.List; import java.util.Locale; +import java.util.Map; import org.json.JSONArray; import org.json.JSONException; import org.json.JSONObject; /** An adapter that wraps {@code Method}. */ public final class MethodDescriptor { + private static final Map<Class<?>, TypeConverter<?>> typeConverters = populateConverters(); + private final Method mMethod; private final Class<? extends Snippet> mClass; @@ -68,6 +75,7 @@ public final class MethodDescriptor { * @throws Throwable the exception raised from executing the RPC method. */ public Object invoke(SnippetManager manager, final JSONArray parameters) throws Throwable { + final Annotation[][] annotations = getParameterAnnotations(); final Type[] parameterTypes = getGenericParameterTypes(); final Object[] args = new Object[parameterTypes.length]; @@ -79,6 +87,12 @@ public final class MethodDescriptor { final Type parameterType = parameterTypes[i]; if (i < parameters.length()) { args[i] = convertParameter(parameters, i, parameterType); + } else if (MethodDescriptor.hasDefaultValue(Arrays.asList(annotations[i]))) { + args[i] = MethodDescriptor.getDefaultValue( + parameterType, Arrays.asList(annotations[i])); + } else if (MethodDescriptor.isOptional(Arrays.asList(annotations[i]))) { + args[i] = MethodDescriptor.getOptionalValue( + parameterType, Arrays.asList(annotations[i])); } else { throw new RpcError("Argument " + (i + 1) + " is not present"); } @@ -88,10 +102,6 @@ public final class MethodDescriptor { } /** Converts a parameter from JSON into a Java Object. */ - // TODO(damonkohler): This signature is a bit weird (auto-refactored). The obvious alternative - // would be to work on one supplied parameter and return the converted parameter. However, - // that's problematic because you lose the ability to call the getXXX methods on the JSON array. - // @VisibleForTesting private static Object convertParameter(final JSONArray parameters, int index, Type type) throws JSONException, RpcError { try { @@ -165,7 +175,8 @@ public final class MethodDescriptor { + " should be of type " + ((Class<?>) type).getSimpleName() + ", but is of type " - + parameters.get(index).getClass().getSimpleName()); + + parameters.get(index).getClass().getSimpleName(), + e); } } @@ -226,6 +237,11 @@ public final class MethodDescriptor { Rpc annotation = mMethod.getAnnotation(Rpc.class); return annotation.description(); } + + public Annotation[][] getParameterAnnotations() { + return mMethod.getParameterAnnotations(); + } + /** * Returns a human-readable help text for this RPC, based on annotations in the source code. * @@ -249,4 +265,140 @@ public final class MethodDescriptor { mMethod.getReturnType().getSimpleName(), getAnnotationDescription()); } + + /** + * Returns the default value for a parameter which has a default value. + * + * @param parameterType parameterType + * @param annotations annotations of the parameter + */ + public static Object getDefaultValue(Type parameterType, Iterable<Annotation> annotations) { + for (Annotation a : annotations) { + if (a instanceof RpcDefault) { + RpcDefault defaultAnnotation = (RpcDefault) a; + TypeConverter<?> converter = + converterFor(parameterType, defaultAnnotation.converter()); + return converter.convert(defaultAnnotation.value()); + } + } + throw new IllegalStateException("No default value for " + parameterType); + } + + /** + * Returns null for an optional parameter. + * + * @param parameterType parameterType + * @param annotations annotations of the parameter + */ + public static Object getOptionalValue(Type parameterType, Iterable<Annotation> annotations) { + for (Annotation a : annotations) { + if (a instanceof RpcOptional) { + return null; + } + } + throw new IllegalStateException("No default value for " + parameterType); + } + + @SuppressWarnings("rawtypes") + private static TypeConverter<?> converterFor( + Type parameterType, Class<? extends TypeConverter> converterClass) { + if (converterClass == TypeConverter.class) { + TypeConverter<?> converter = typeConverters.get(parameterType); + if (converter == null) { + throw new IllegalArgumentException( + String.format("No predefined converter found for %s", parameterType)); + } + return converter; + } + try { + Constructor<?> constructor = converterClass.getConstructor(new Class<?>[0]); + return (TypeConverter<?>) constructor.newInstance(new Object[0]); + } catch (Exception e) { + throw new IllegalArgumentException( + String.format( + "Cannot create converter from %s", converterClass.getCanonicalName()), + e); + } + } + + /** + * Determines whether or not this parameter has default value. + * + * @param annotations annotations of the parameter + */ + public static boolean hasDefaultValue(Iterable<Annotation> annotations) { + for (Annotation a : annotations) { + if (a instanceof RpcDefault) { + return true; + } + } + return false; + } + + /** + * Determines whether or not this parameter is optional. + * + * @param annotations annotations of the parameter + */ + public static boolean isOptional(Iterable<Annotation> annotations) { + for (Annotation a : annotations) { + if (a instanceof RpcOptional) { + return true; + } + } + return false; + } + + /** + * Returns the converters for {@code String}, {@code Integer}, {@code Long}, + * and {@code Boolean}. + */ + private static Map<Class<?>, TypeConverter<?>> populateConverters() { + Map<Class<?>, TypeConverter<?>> converters = new HashMap<>(); + converters.put(String.class, new TypeConverter<String>() { + @Override + public String convert(String value) { + return value; + } + }); + converters.put(Integer.class, new TypeConverter<Integer>() { + @Override + public Integer convert(String input) { + try { + return Integer.decode(input); + } catch (NumberFormatException e) { + throw new IllegalArgumentException( + String.format("'%s' is not a Integer", input), e); + } + } + }); + converters.put(Long.class, new TypeConverter<Long>() { + @Override + public Long convert(String input) { + try { + return Long.decode(input); + } catch (NumberFormatException e) { + throw new IllegalArgumentException( + String.format("'%s' is not a Long", input), e); + } + } + }); + converters.put(Boolean.class, new TypeConverter<Boolean>() { + @Override + public Boolean convert(String input) { + if (input == null) { + return null; + } + input = input.toLowerCase(Locale.ROOT); + if (input.equals("true")) { + return Boolean.TRUE; + } + if (input.equals("false")) { + return Boolean.FALSE; + } + throw new IllegalArgumentException(String.format("'%s' is not a Boolean", input)); + } + }); + return converters; + } } |