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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.xbean.recipe;
import java.lang.reflect.Array;
import java.lang.reflect.Constructor;
import java.lang.reflect.GenericArrayType;
import java.lang.reflect.Modifier;
import java.lang.reflect.ParameterizedType;
import java.lang.reflect.Type;
import java.lang.reflect.TypeVariable;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import org.apache.xbean.propertyeditor.PropertyEditors;
/**
* @version $Rev: 6687 $ $Date: 2005-12-28T21:08:56.733437Z $
*/
public final class RecipeHelper {
private RecipeHelper() {
}
public static Recipe getCaller() {
LinkedList stack = ExecutionContext.getContext().getStack();
if (stack.size() < 2) {
return null;
}
return stack.get(stack.size() - 2);
}
public static Class loadClass(String name) throws ClassNotFoundException {
ClassLoader classLoader = ExecutionContext.getContext().getClassLoader();
Class type = Class.forName(name, true, classLoader);
return type;
}
public static boolean hasDefaultConstructor(Class type) {
if (!Modifier.isPublic(type.getModifiers())) {
return false;
}
if (Modifier.isAbstract(type.getModifiers())) {
return false;
}
Constructor[] constructors = type.getConstructors();
for (Constructor constructor : constructors) {
if (Modifier.isPublic(constructor.getModifiers()) &&
constructor.getParameterTypes().length == 0) {
return true;
}
}
return false;
}
public static boolean isSimpleType(Object o) {
return o == null ||
o instanceof Boolean ||
o instanceof Character ||
o instanceof Byte ||
o instanceof Short ||
o instanceof Integer ||
o instanceof Long ||
o instanceof Float ||
o instanceof Double ||
o instanceof String ||
o instanceof Recipe;
}
public static List> prioritizeProperties(Map properties) {
ArrayList> entries = new ArrayList>(properties.entrySet());
Collections.sort(entries, new RecipeComparator());
return entries;
}
public static boolean isInstance(Type t, Object instance) {
Class type = toClass(t);
if (type.isPrimitive()) {
// for primitives the insance can't be null
if (instance == null) {
return false;
}
// verify instance is the correct wrapper type
if (type.equals(boolean.class)) {
return instance instanceof Boolean;
} else if (type.equals(char.class)) {
return instance instanceof Character;
} else if (type.equals(byte.class)) {
return instance instanceof Byte;
} else if (type.equals(short.class)) {
return instance instanceof Short;
} else if (type.equals(int.class)) {
return instance instanceof Integer;
} else if (type.equals(long.class)) {
return instance instanceof Long;
} else if (type.equals(float.class)) {
return instance instanceof Float;
} else if (type.equals(double.class)) {
return instance instanceof Double;
} else {
throw new AssertionError("Invalid primitve type: " + type);
}
}
return instance == null || type.isInstance(instance);
}
public static boolean isConvertable(Type type, Object propertyValue) {
if (propertyValue instanceof Recipe) {
Recipe recipe = (Recipe) propertyValue;
return recipe.canCreate(type);
}
return (propertyValue instanceof String && PropertyEditors.canConvert(toClass(type)));
}
public static boolean isAssignableFrom(Class expected, Class actual) {
if (expected == null) return true;
if (expected.isPrimitive()) {
// verify actual is the correct wrapper type
if (expected.equals(boolean.class)) {
return actual.equals(Boolean.class);
} else if (expected.equals(char.class)) {
return actual.equals(Character.class);
} else if (expected.equals(byte.class)) {
return actual.equals(Byte.class);
} else if (expected.equals(short.class)) {
return actual.equals(Short.class);
} else if (expected.equals(int.class)) {
return actual.equals(Integer.class);
} else if (expected.equals(long.class)) {
return actual.equals(Long.class);
} else if (expected.equals(float.class)) {
return actual.equals(Float.class);
} else if (expected.equals(double.class)) {
return actual.equals(Double.class);
} else {
throw new AssertionError("Invalid primitve type: " + expected);
}
}
return expected.isAssignableFrom(actual);
}
public static Object convert(Type expectedType, Object value, boolean lazyRefAllowed) {
if (value instanceof Recipe) {
Recipe recipe = (Recipe) value;
value = recipe.create(expectedType, lazyRefAllowed);
}
if (value instanceof String && (expectedType != Object.class)) {
String stringValue = (String) value;
value = PropertyEditors.getValue(expectedType, stringValue);
}
return value;
}
public static boolean isAssignableFrom(List> expectedTypes, List> actualTypes) {
if (expectedTypes.size() != actualTypes.size()) {
return false;
}
for (int i = 0; i < expectedTypes.size(); i++) {
Class expectedType = expectedTypes.get(i);
Class actualType = actualTypes.get(i);
if (expectedType != actualType && !isAssignableFrom(expectedType, actualType)) {
return false;
}
}
return true;
}
public static boolean isAssignable(Type expectedType, Type actualType) {
Class expectedClass = toClass(expectedType);
Class actualClass = toClass(actualType);
return expectedClass.isAssignableFrom(actualClass);
}
public static Class toClass(Type type) {
// GenericArrayType, ParameterizedType, TypeVariable, WildcardType
if (type instanceof Class) {
Class clazz = (Class) type;
return clazz;
} else if (type instanceof GenericArrayType) {
GenericArrayType arrayType = (GenericArrayType) type;
Class componentType = toClass(arrayType.getGenericComponentType());
return Array.newInstance(componentType, 0).getClass();
} else if (type instanceof ParameterizedType) {
ParameterizedType parameterizedType = (ParameterizedType) type;
return toClass(parameterizedType.getRawType());
} else {
return Object.class;
}
}
public static class RecipeComparator implements Comparator © 2015 - 2025 Weber Informatics LLC | Privacy Policy