762 lines
27 KiB
Java
762 lines
27 KiB
Java
|
/**
|
||
|
* Copyright (c) 2011-2013, Lukas Eder, lukas.eder@gmail.com
|
||
|
* All rights reserved.
|
||
|
*
|
||
|
* This software is licensed to you under the Apache License, Version 2.0
|
||
|
* (the "License"); You may obtain a copy of the License at
|
||
|
*
|
||
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
*
|
||
|
* Redistribution and use in source and binary forms, with or without
|
||
|
* modification, are permitted provided that the following conditions are met:
|
||
|
*
|
||
|
* . Redistributions of source code must retain the above copyright notice, this
|
||
|
* list of conditions and the following disclaimer.
|
||
|
*
|
||
|
* . Redistributions in binary form must reproduce the above copyright notice,
|
||
|
* this list of conditions and the following disclaimer in the documentation
|
||
|
* and/or other materials provided with the distribution.
|
||
|
*
|
||
|
* . Neither the name "jOOR" nor the names of its contributors may be
|
||
|
* used to endorse or promote products derived from this software without
|
||
|
* specific prior written permission.
|
||
|
*
|
||
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
||
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
||
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
||
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
||
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
||
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
||
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
||
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
||
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
||
|
* POSSIBILITY OF SUCH DAMAGE.
|
||
|
*/
|
||
|
package pw.yumc.YumCore.reflect;
|
||
|
|
||
|
import java.lang.reflect.AccessibleObject;
|
||
|
import java.lang.reflect.Constructor;
|
||
|
import java.lang.reflect.Field;
|
||
|
import java.lang.reflect.InvocationHandler;
|
||
|
import java.lang.reflect.Method;
|
||
|
import java.lang.reflect.Modifier;
|
||
|
import java.lang.reflect.Proxy;
|
||
|
import java.util.Arrays;
|
||
|
import java.util.LinkedHashMap;
|
||
|
import java.util.Map;
|
||
|
|
||
|
/**
|
||
|
* A wrapper for an {@link Object} or {@link Class} upon which reflective calls can be made.
|
||
|
* <p>
|
||
|
* An example of using <code>Reflect</code> is <code>
|
||
|
*
|
||
|
* <pre>
|
||
|
* // Static import all reflection methods to decrease verbosity
|
||
|
* import static org.joor.Reflect.*;
|
||
|
*
|
||
|
* // Wrap an Object / Class / class name with the on() method:
|
||
|
* on("java.lang.String")
|
||
|
* // Invoke constructors using the create() method:
|
||
|
* .create("Hello World")
|
||
|
* // Invoke methods using the call() method:
|
||
|
* .call("toString")
|
||
|
* // Retrieve the wrapped object
|
||
|
*
|
||
|
* @author Lukas Eder
|
||
|
*/
|
||
|
public class Reflect {
|
||
|
|
||
|
// ---------------------------------------------------------------------
|
||
|
// Static API used as entrance points to the fluent API
|
||
|
// ---------------------------------------------------------------------
|
||
|
|
||
|
/**
|
||
|
* The wrapped object
|
||
|
*/
|
||
|
private final Object object;
|
||
|
|
||
|
/**
|
||
|
* A flag indicating whether the wrapped object is a {@link Class} (for accessing static fields and methods), or any
|
||
|
* other type of {@link Object} (for accessing instance fields and methods).
|
||
|
*/
|
||
|
private final boolean isClass;
|
||
|
|
||
|
private Reflect(final Class<?> type) {
|
||
|
this.object = type;
|
||
|
this.isClass = true;
|
||
|
}
|
||
|
|
||
|
private Reflect(final Object object) {
|
||
|
this.object = object;
|
||
|
this.isClass = false;
|
||
|
}
|
||
|
|
||
|
// ---------------------------------------------------------------------
|
||
|
// Members
|
||
|
// ---------------------------------------------------------------------
|
||
|
|
||
|
/**
|
||
|
* Conveniently render an {@link AccessibleObject} accessible
|
||
|
*
|
||
|
* @param <T>
|
||
|
* 对象类型
|
||
|
* @param accessible
|
||
|
* The object to render accessible
|
||
|
* @return The argument object rendered accessible
|
||
|
*/
|
||
|
public static <T extends AccessibleObject> T accessible(final T accessible) {
|
||
|
if (accessible == null) {
|
||
|
return null;
|
||
|
}
|
||
|
|
||
|
if (!accessible.isAccessible()) {
|
||
|
accessible.setAccessible(true);
|
||
|
}
|
||
|
|
||
|
return accessible;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
*
|
||
|
* 获得公共字段
|
||
|
*
|
||
|
* @param clazz
|
||
|
* 类名
|
||
|
* @param name
|
||
|
* 字段名
|
||
|
* @return 字段{@link Field}
|
||
|
* @throws NoSuchFieldException
|
||
|
*/
|
||
|
public static Field getDeclaredField(Class<?> clazz, final String name) throws NoSuchFieldException {
|
||
|
Field field = null;
|
||
|
while (clazz != Object.class) {
|
||
|
try {
|
||
|
field = clazz.getDeclaredField(name);
|
||
|
if (field != null) {
|
||
|
break;
|
||
|
}
|
||
|
} catch (final Exception e) {
|
||
|
clazz = clazz.getSuperclass();
|
||
|
}
|
||
|
}
|
||
|
if (field == null) {
|
||
|
throw new NoSuchFieldException("name is not found");
|
||
|
}
|
||
|
return field;
|
||
|
}
|
||
|
|
||
|
// ---------------------------------------------------------------------
|
||
|
// Constructors
|
||
|
// ---------------------------------------------------------------------
|
||
|
|
||
|
/**
|
||
|
* Wrap a class.
|
||
|
* <p>
|
||
|
* Use this when you want to access static fields and methods on a {@link Class} object, or as a basis for
|
||
|
* constructing objects of that class using {@link #create(Object...)}
|
||
|
*
|
||
|
* @param clazz
|
||
|
* The class to be wrapped
|
||
|
* @return A wrapped class object, to be used for further reflection.
|
||
|
*/
|
||
|
public static Reflect on(final Class<?> clazz) {
|
||
|
return new Reflect(clazz);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Wrap an object.
|
||
|
* <p>
|
||
|
* Use this when you want to access instance fields and methods on any {@link Object}
|
||
|
*
|
||
|
* @param object
|
||
|
* The object to be wrapped
|
||
|
* @return A wrapped object, to be used for further reflection.
|
||
|
*/
|
||
|
public static Reflect on(final Object object) {
|
||
|
return new Reflect(object);
|
||
|
}
|
||
|
|
||
|
// ---------------------------------------------------------------------
|
||
|
// Fluent Reflection API
|
||
|
// ---------------------------------------------------------------------
|
||
|
|
||
|
/**
|
||
|
* Wrap a class name.
|
||
|
* <p>
|
||
|
* This is the same as calling <code>on(Class.forName(name))</code>
|
||
|
*
|
||
|
* @param name
|
||
|
* A fully qualified class name
|
||
|
* @return A wrapped class object, to be used for further reflection.
|
||
|
* @throws ReflectException
|
||
|
* If any reflection exception occurred.
|
||
|
* @see #on(Class)
|
||
|
*/
|
||
|
public static Reflect on(final String name) throws ReflectException {
|
||
|
return on(forName(name));
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Get a wrapper type for a primitive type, or the argument type itself, if it is not a primitive type.
|
||
|
*/
|
||
|
public static Class<?> wrapper(final Class<?> type) {
|
||
|
if (type == null) {
|
||
|
return null;
|
||
|
} else if (type.isPrimitive()) {
|
||
|
if (boolean.class == type) {
|
||
|
return Boolean.class;
|
||
|
} else if (int.class == type) {
|
||
|
return Integer.class;
|
||
|
} else if (long.class == type) {
|
||
|
return Long.class;
|
||
|
} else if (short.class == type) {
|
||
|
return Short.class;
|
||
|
} else if (byte.class == type) {
|
||
|
return Byte.class;
|
||
|
} else if (double.class == type) {
|
||
|
return Double.class;
|
||
|
} else if (float.class == type) {
|
||
|
return Float.class;
|
||
|
} else if (char.class == type) {
|
||
|
return Character.class;
|
||
|
} else if (void.class == type) {
|
||
|
return Void.class;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return type;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Load a class
|
||
|
*
|
||
|
* @see Class#forName(String)
|
||
|
*/
|
||
|
private static Class<?> forName(final String name) throws ReflectException {
|
||
|
try {
|
||
|
return Class.forName(name);
|
||
|
} catch (final Exception e) {
|
||
|
throw new ReflectException(e);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Wrap an object created from a constructor
|
||
|
*/
|
||
|
private static Reflect on(final Constructor<?> constructor, final Object... args) throws ReflectException {
|
||
|
try {
|
||
|
return on(accessible(constructor).newInstance(args));
|
||
|
} catch (final Exception e) {
|
||
|
throw new ReflectException(e);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Wrap an object returned from a method
|
||
|
*/
|
||
|
private static Reflect on(final Method method, final Object object, final Object... args) throws ReflectException {
|
||
|
try {
|
||
|
accessible(method);
|
||
|
|
||
|
if (method.getReturnType() == void.class) {
|
||
|
method.invoke(object, args);
|
||
|
return on(object);
|
||
|
}
|
||
|
return on(method.invoke(object, args));
|
||
|
} catch (final Exception e) {
|
||
|
throw new ReflectException(e);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Get the POJO property name of an getter/setter
|
||
|
*/
|
||
|
private static String property(final String string) {
|
||
|
final int length = string.length();
|
||
|
|
||
|
if (length == 0) {
|
||
|
return "";
|
||
|
} else if (length == 1) {
|
||
|
return string.toLowerCase();
|
||
|
} else {
|
||
|
return string.substring(0, 1).toLowerCase() + string.substring(1);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Get an array of types for an array of objects
|
||
|
*
|
||
|
* @see Object#getClass()
|
||
|
*/
|
||
|
private static Class<?>[] types(final Object... values) {
|
||
|
if (values == null) {
|
||
|
return new Class[0];
|
||
|
}
|
||
|
|
||
|
final Class<?>[] result = new Class[values.length];
|
||
|
|
||
|
for (int i = 0; i < values.length; i++) {
|
||
|
final Object value = values[i];
|
||
|
result[i] = value == null ? Object.class : value.getClass();
|
||
|
}
|
||
|
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Unwrap an object
|
||
|
*/
|
||
|
private static Object unwrap(final Object object) {
|
||
|
if (object instanceof Reflect) {
|
||
|
return ((Reflect) object).get();
|
||
|
}
|
||
|
|
||
|
return object;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Create a proxy for the wrapped object allowing to typesafely invoke methods on it using a custom interface
|
||
|
*
|
||
|
* @param proxyType
|
||
|
* The interface type that is implemented by the proxy
|
||
|
* @return A proxy for the wrapped object
|
||
|
*/
|
||
|
@SuppressWarnings("unchecked")
|
||
|
public <P> P as(final Class<P> proxyType) {
|
||
|
final boolean isMap = (object instanceof Map);
|
||
|
final InvocationHandler handler = new InvocationHandler() {
|
||
|
@Override
|
||
|
public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
|
||
|
final String name = method.getName();
|
||
|
|
||
|
// Actual method name matches always come first
|
||
|
try {
|
||
|
return on(object).call(name, args).get();
|
||
|
}
|
||
|
|
||
|
// [#14] Simulate POJO behaviour on wrapped map objects
|
||
|
catch (final ReflectException e) {
|
||
|
if (isMap) {
|
||
|
final Map<String, Object> map = (Map<String, Object>) object;
|
||
|
final int length = (args == null ? 0 : args.length);
|
||
|
|
||
|
if (length == 0 && name.startsWith("get")) {
|
||
|
return map.get(property(name.substring(3)));
|
||
|
} else if (length == 0 && name.startsWith("is")) {
|
||
|
return map.get(property(name.substring(2)));
|
||
|
} else if (length == 1 && name.startsWith("set")) {
|
||
|
map.put(property(name.substring(3)), args[0]);
|
||
|
return null;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
throw e;
|
||
|
}
|
||
|
}
|
||
|
};
|
||
|
|
||
|
return (P) Proxy.newProxyInstance(proxyType.getClassLoader(), new Class[] { proxyType }, handler);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Call a method by its name.
|
||
|
* <p>
|
||
|
* This is a convenience method for calling <code>call(name, new Object[0])</code>
|
||
|
*
|
||
|
* @param name
|
||
|
* The method name
|
||
|
* @return The wrapped method result or the same wrapped object if the method returns <code>void</code>, to be used
|
||
|
* for further reflection.
|
||
|
* @throws ReflectException
|
||
|
* If any reflection exception occurred.
|
||
|
* @see #call(String, Object...)
|
||
|
*/
|
||
|
public Reflect call(final String name) throws ReflectException {
|
||
|
return call(name, new Object[0]);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Call a method by its name.
|
||
|
* <p>
|
||
|
* This is roughly equivalent to {@link Method#invoke(Object, Object...)}. If the wrapped object is a {@link Class},
|
||
|
* then this will invoke a static method. If the wrapped object is any other {@link Object}, then this will invoke
|
||
|
* an instance method.
|
||
|
* <p>
|
||
|
* Just like {@link Method#invoke(Object, Object...)}, this will try to wrap primitive types or unwrap primitive
|
||
|
* type wrappers if applicable. If several methods are applicable, by that rule, the first one encountered is
|
||
|
* called. i.e. when calling
|
||
|
*
|
||
|
* <pre>
|
||
|
* <code>on(...).call("method", 1, 1);</code>
|
||
|
* </pre>
|
||
|
*
|
||
|
* The first of the following methods will be called:
|
||
|
*
|
||
|
* <pre>
|
||
|
* <code>
|
||
|
* public void method(int param1, Integer param2);
|
||
|
* public void method(Integer param1, int param2);
|
||
|
* public void method(Number param1, Number param2);
|
||
|
* public void method(Number param1, Object param2);
|
||
|
* public void method(int param1, Object param2);
|
||
|
* </code>
|
||
|
* </pre>
|
||
|
*
|
||
|
* <p>
|
||
|
* The best matching method is searched for with the following strategy:
|
||
|
* <ol>
|
||
|
* <li>public method with exact signature match in class hierarchy</li>
|
||
|
* <li>non-public method with exact signature match on declaring class</li>
|
||
|
* <li>public method with similar signature in class hierarchy</li>
|
||
|
* <li>non-public method with similar signature on declaring class</li>
|
||
|
* </ol>
|
||
|
*
|
||
|
* @param name
|
||
|
* The method name
|
||
|
* @param args
|
||
|
* The method arguments
|
||
|
* @return The wrapped method result or the same wrapped object if the method returns <code>void</code>, to be used
|
||
|
* for further reflection.
|
||
|
* @throws ReflectException
|
||
|
* If any reflection exception occurred.
|
||
|
*/
|
||
|
public Reflect call(final String name, final Object... args) throws ReflectException {
|
||
|
final Class<?>[] types = types(args);
|
||
|
|
||
|
// Try invoking the "canonical" method, i.e. the one with exact
|
||
|
// matching argument types
|
||
|
try {
|
||
|
final Method method = exactMethod(name, types);
|
||
|
return on(method, object, args);
|
||
|
}
|
||
|
|
||
|
// If there is no exact match, try to find a method that has a "similar"
|
||
|
// signature if primitive argument types are converted to their wrappers
|
||
|
catch (final NoSuchMethodException e) {
|
||
|
try {
|
||
|
final Method method = similarMethod(name, types);
|
||
|
return on(method, object, args);
|
||
|
} catch (final NoSuchMethodException e1) {
|
||
|
throw new ReflectException(e1);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Call a constructor.
|
||
|
* <p>
|
||
|
* This is a convenience method for calling <code>create(new Object[0])</code>
|
||
|
*
|
||
|
* @return The wrapped new object, to be used for further reflection.
|
||
|
* @throws ReflectException
|
||
|
* If any reflection exception occurred.
|
||
|
* @see #create(Object...)
|
||
|
*/
|
||
|
public Reflect create() throws ReflectException {
|
||
|
return create(new Object[0]);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Call a constructor.
|
||
|
* <p>
|
||
|
* This is roughly equivalent to {@link Constructor#newInstance(Object...)}. If the wrapped object is a
|
||
|
* {@link Class}, then this will create a new object of that class. If the wrapped object is any other
|
||
|
* {@link Object}, then this will create a new object of the same type.
|
||
|
* <p>
|
||
|
* Just like {@link Constructor#newInstance(Object...)}, this will try to wrap primitive types or unwrap primitive
|
||
|
* type wrappers if applicable. If several constructors are applicable, by that rule, the first one encountered is
|
||
|
* called. i.e. when calling
|
||
|
*
|
||
|
* <pre>
|
||
|
* <code>
|
||
|
* on(C.class).create(1, 1);
|
||
|
* </code>
|
||
|
* </pre>
|
||
|
*
|
||
|
* The first of the following constructors will be applied:
|
||
|
*
|
||
|
* <pre>
|
||
|
* <code>
|
||
|
* public C(int param1, Integer param2);
|
||
|
* public C(Integer param1, int param2);
|
||
|
* public C(Number param1, Number param2);
|
||
|
* public C(Number param1, Object param2);
|
||
|
* public C(int param1, Object param2);
|
||
|
* </code>
|
||
|
* </pre>
|
||
|
*
|
||
|
* @param args
|
||
|
* The constructor arguments
|
||
|
* @return The wrapped new object, to be used for further reflection.
|
||
|
* @throws ReflectException
|
||
|
* If any reflection exception occurred.
|
||
|
*/
|
||
|
public Reflect create(final Object... args) throws ReflectException {
|
||
|
final Class<?>[] types = types(args);
|
||
|
|
||
|
// Try invoking the "canonical" constructor, i.e. the one with exact
|
||
|
// matching argument types
|
||
|
try {
|
||
|
final Constructor<?> constructor = type().getDeclaredConstructor(types);
|
||
|
return on(constructor, args);
|
||
|
}
|
||
|
|
||
|
// If there is no exact match, try to find one that has a "similar"
|
||
|
// signature if primitive argument types are converted to their wrappers
|
||
|
catch (final NoSuchMethodException e) {
|
||
|
for (final Constructor<?> constructor : type().getConstructors()) {
|
||
|
if (match(constructor.getParameterTypes(), types)) {
|
||
|
return on(constructor, args);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
throw new ReflectException(e);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* {@inheritDoc}
|
||
|
*/
|
||
|
@Override
|
||
|
public boolean equals(final Object obj) {
|
||
|
if (obj instanceof Reflect) {
|
||
|
return object.equals(((Reflect) obj).get());
|
||
|
}
|
||
|
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Get a wrapped field.
|
||
|
* <p>
|
||
|
* This is roughly equivalent to {@link Field#get(Object)}. If the wrapped object is a {@link Class}, then this will
|
||
|
* wrap a static member field. If the wrapped object is any other {@link Object}, then this wrap an instance member
|
||
|
* field.
|
||
|
*
|
||
|
* @param name
|
||
|
* The field name
|
||
|
* @return The wrapped field
|
||
|
* @throws ReflectException
|
||
|
* If any reflection exception occurred.
|
||
|
*/
|
||
|
public Reflect field(final String name) throws ReflectException {
|
||
|
try {
|
||
|
|
||
|
// Try getting a public field
|
||
|
final Field field = type().getField(name);
|
||
|
return on(field.get(object));
|
||
|
} catch (final Exception e1) {
|
||
|
|
||
|
// Try again, getting a non-public field
|
||
|
try {
|
||
|
return on(accessible(getDeclaredField(type(), name)).get(object));
|
||
|
} catch (final Exception e2) {
|
||
|
throw new ReflectException(e2);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// ---------------------------------------------------------------------
|
||
|
// Object API
|
||
|
// ---------------------------------------------------------------------
|
||
|
|
||
|
/**
|
||
|
* Get a Map containing field names and wrapped values for the fields' values.
|
||
|
* <p>
|
||
|
* If the wrapped object is a {@link Class}, then this will return static fields. If the wrapped object is any other
|
||
|
* {@link Object}, then this will return instance fields.
|
||
|
* <p>
|
||
|
* These two calls are equivalent
|
||
|
*
|
||
|
* <pre>
|
||
|
* <code>
|
||
|
* on(object).field("myField");
|
||
|
* on(object).fields().get("myField");
|
||
|
* </code>
|
||
|
* </pre>
|
||
|
*
|
||
|
* @return A map containing field names and wrapped values.
|
||
|
*/
|
||
|
public Map<String, Reflect> fields() {
|
||
|
final Map<String, Reflect> result = new LinkedHashMap<String, Reflect>();
|
||
|
|
||
|
for (final Field field : type().getFields()) {
|
||
|
if (!isClass ^ Modifier.isStatic(field.getModifiers())) {
|
||
|
final String name = field.getName();
|
||
|
result.put(name, field(name));
|
||
|
}
|
||
|
}
|
||
|
return result;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Get the wrapped object
|
||
|
*
|
||
|
* @param <T>
|
||
|
* A convenience generic parameter for automatic unsafe casting
|
||
|
*/
|
||
|
@SuppressWarnings("unchecked")
|
||
|
public <T> T get() {
|
||
|
return (T) object;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Get a field value.
|
||
|
* <p>
|
||
|
* This is roughly equivalent to {@link Field#get(Object)}. If the wrapped object is a {@link Class}, then this will
|
||
|
* get a value from a static member field. If the wrapped object is any other {@link Object}, then this will get a
|
||
|
* value from an instance member field.
|
||
|
* <p>
|
||
|
* If you want to "navigate" to a wrapped version of the field, use {@link #field(String)} instead.
|
||
|
*
|
||
|
* @param name
|
||
|
* The field name
|
||
|
* @return The field value
|
||
|
* @throws ReflectException
|
||
|
* If any reflection exception occurred.
|
||
|
* @see #field(String)
|
||
|
*/
|
||
|
public <T> T get(final String name) throws ReflectException {
|
||
|
return field(name).<T> get();
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* {@inheritDoc}
|
||
|
*/
|
||
|
@Override
|
||
|
public int hashCode() {
|
||
|
return object.hashCode();
|
||
|
}
|
||
|
|
||
|
// ---------------------------------------------------------------------
|
||
|
// Utility methods
|
||
|
// ---------------------------------------------------------------------
|
||
|
|
||
|
/**
|
||
|
* Set a field value.
|
||
|
* <p>
|
||
|
* This is roughly equivalent to {@link Field#set(Object, Object)}. If the wrapped object is a {@link Class}, then
|
||
|
* this will set a value to a static member field. If the wrapped object is any other {@link Object}, then this will
|
||
|
* set a value to an instance member field.
|
||
|
*
|
||
|
* @param name
|
||
|
* The field name
|
||
|
* @param value
|
||
|
* The new field value
|
||
|
* @return The same wrapped object, to be used for further reflection.
|
||
|
* @throws ReflectException
|
||
|
* If any reflection exception occurred.
|
||
|
*/
|
||
|
public Reflect set(final String name, final Object value) throws ReflectException {
|
||
|
try {
|
||
|
|
||
|
// Try setting a public field
|
||
|
final Field field = type().getField(name);
|
||
|
field.set(object, unwrap(value));
|
||
|
return this;
|
||
|
} catch (final Exception e1) {
|
||
|
|
||
|
// Try again, setting a non-public field
|
||
|
try {
|
||
|
accessible(type().getDeclaredField(name)).set(object, unwrap(value));
|
||
|
return this;
|
||
|
} catch (final Exception e2) {
|
||
|
throw new ReflectException(e2);
|
||
|
}
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* {@inheritDoc}
|
||
|
*/
|
||
|
@Override
|
||
|
public String toString() {
|
||
|
return object.toString();
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Get the type of the wrapped object.
|
||
|
*
|
||
|
* @see Object#getClass()
|
||
|
*/
|
||
|
public Class<?> type() {
|
||
|
if (isClass) {
|
||
|
return (Class<?>) object;
|
||
|
}
|
||
|
return object.getClass();
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Searches a method with the exact same signature as desired.
|
||
|
* <p>
|
||
|
* If a public method is found in the class hierarchy, this method is returned. Otherwise a private method with the
|
||
|
* exact same signature is returned. If no exact match could be found, we let the {@code NoSuchMethodException} pass
|
||
|
* through.
|
||
|
*/
|
||
|
private Method exactMethod(final String name, final Class<?>[] types) throws NoSuchMethodException {
|
||
|
final Class<?> type = type();
|
||
|
|
||
|
// first priority: find a public method with exact signature match in class hierarchy
|
||
|
try {
|
||
|
return type.getMethod(name, types);
|
||
|
}
|
||
|
|
||
|
// second priority: find a private method with exact signature match on declaring class
|
||
|
catch (final NoSuchMethodException e) {
|
||
|
return type.getDeclaredMethod(name, types);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Determines if a method has a "similar" signature, especially if wrapping primitive argument types would result in
|
||
|
* an exactly matching signature.
|
||
|
*/
|
||
|
private boolean isSimilarSignature(final Method possiblyMatchingMethod, final String desiredMethodName, final Class<?>[] desiredParamTypes) {
|
||
|
return possiblyMatchingMethod.getName().equals(desiredMethodName) && match(possiblyMatchingMethod.getParameterTypes(), desiredParamTypes);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Check whether two arrays of types match, converting primitive types to their corresponding wrappers.
|
||
|
*/
|
||
|
private boolean match(final Class<?>[] declaredTypes, final Class<?>[] actualTypes) {
|
||
|
if (declaredTypes.length == actualTypes.length) {
|
||
|
for (int i = 0; i < actualTypes.length; i++) {
|
||
|
if (!wrapper(declaredTypes[i]).isAssignableFrom(wrapper(actualTypes[i]))) {
|
||
|
return false;
|
||
|
}
|
||
|
}
|
||
|
return true;
|
||
|
}
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Searches a method with a similar signature as desired using
|
||
|
* {@link #isSimilarSignature(java.lang.reflect.Method, String, Class[])}.
|
||
|
* <p>
|
||
|
* First public methods are searched in the class hierarchy, then private methods on the declaring class. If a
|
||
|
* method could be found, it is returned, otherwise a {@code NoSuchMethodException} is thrown.
|
||
|
*/
|
||
|
private Method similarMethod(final String name, final Class<?>[] types) throws NoSuchMethodException {
|
||
|
final Class<?> type = type();
|
||
|
|
||
|
// first priority: find a public method with a "similar" signature in class hierarchy
|
||
|
// similar interpreted in when primitive argument types are converted to their wrappers
|
||
|
for (final Method method : type.getMethods()) {
|
||
|
if (isSimilarSignature(method, name, types)) {
|
||
|
return method;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
// second priority: find a non-public method with a "similar" signature on declaring class
|
||
|
for (final Method method : type.getDeclaredMethods()) {
|
||
|
if (isSimilarSignature(method, name, types)) {
|
||
|
return method;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
throw new NoSuchMethodException("No similar method " + name + " with params " + Arrays.toString(types) + " could be found on type " + type() + ".");
|
||
|
}
|
||
|
}
|