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A fork of @kirilcool's substance project
/*
* @(#)Methods.java 1.3.1 2006-09-18
*
* Copyright (c) 2005-2006 Werner Randelshofer
* Staldenmattweg 2, Immensee, CH-6405, Switzerland.
* All rights reserved.
*
* This software is the confidential and proprietary information of
* Werner Randelshofer. ("Confidential Information"). You shall not
* disclose such Confidential Information and shall use it only in
* accordance with the terms of the license agreement you entered into
* with Werner Randelshofer.
*/
package org.pushingpixels.substance.internal.contrib.randelshofer.quaqua.util;
import java.lang.reflect.*;
/**
* Methods contains convenience methods for method invocations using
* java.lang.reflect.
*
* @author Werner Randelshofer
* @version 1.3.1 2006-09-18 Fixed javadoc warnings.
*
1.2 2006-08-20 Additional invokeIfExists method added.
*
1.2 2006-05-07 Added invokeNew method.
*
1.1 2006-02-18 Added more convenience methods.
*
1.0 September 24, 2005 Created.
*/
public class Methods {
/**
* Prevent instance creation.
*/
private Methods() {
}
/**
* Invokes the specified accessible parameterless method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
* @return The return value of the method.
* @return NoSuchMethodException if the method does not exist or is not
* accessible.
*/
public static Object invoke(Object obj, String methodName)
throws NoSuchMethodException {
try {
Method method = obj.getClass().getMethod(methodName, new Class[0]);
Object result = method.invoke(obj, new Object[0]);
return result;
} catch (IllegalAccessException e) {
throw new NoSuchMethodException(methodName+" is not accessible");
} catch (InvocationTargetException e) {
// The method is not supposed to throw exceptions
throw new InternalError(e.getMessage());
}
}
/**
* Invokes the specified accessible method with a string parameter if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
* @param stringParameter The String parameter
* @return The return value of the method or METHOD_NOT_FOUND.
* @return NoSuchMethodException if the method does not exist or is not accessible.
*/
public static Object invoke(Object obj, String methodName, String stringParameter)
throws NoSuchMethodException {
try {
Method method = obj.getClass().getMethod(methodName, new Class[] { String.class });
Object result = method.invoke(obj, new Object[] { stringParameter });
return result;
} catch (IllegalAccessException e) {
throw new NoSuchMethodException(methodName+" is not accessible");
} catch (InvocationTargetException e) {
// The method is not supposed to throw exceptions
throw new InternalError(e.getMessage());
}
}
/**
* Invokes the specified method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
* @param types The parameter types.
* @param values The parameter values.
* @return The return value of the method.
* @return NoSuchMethodException if the method does not exist or is not accessible.
*/
public static Object invoke(Object obj, String methodName, Class[] types, Object[] values)
throws NoSuchMethodException {
try {
Method method = obj.getClass().getMethod(methodName, types);
Object result = method.invoke(obj, values);
return result;
} catch (IllegalAccessException e) {
throw new NoSuchMethodException(methodName+" is not accessible");
} catch (InvocationTargetException e) {
// The method is not supposed to throw exceptions
throw new InternalError(e.getMessage());
}
}
/**
* Invokes the specified accessible parameterless method if it exists.
*
* @param clazz The class on which to invoke the method.
* @param methodName The name of the method.
* @return The return value of the method or METHOD_NOT_FOUND.
* @return NoSuchMethodException if the method does not exist or is not accessible.
*/
public static Object invokeStatic(Class clazz, String methodName)
throws NoSuchMethodException {
try {
Method method = clazz.getMethod(methodName, new Class[0]);
Object result = method.invoke(null, new Object[0]);
return result;
} catch (IllegalAccessException e) {
throw new NoSuchMethodException(methodName+" is not accessible");
} catch (InvocationTargetException e) {
// The method is not supposed to throw exceptions
throw new InternalError(e.getMessage());
}
}
/**
* Invokes the specified static parameterless method if it exists.
*
* @param clazz The class on which to invoke the method.
* @param methodName The name of the method.
* @return The return value of the method.
* @return NoSuchMethodException if the method does not exist or is not accessible.
*/
public static Object invokeStatic(String clazz, String methodName)
throws NoSuchMethodException {
try {
return invokeStatic(Class.forName(clazz), methodName);
} catch (ClassNotFoundException e) {
throw new NoSuchMethodException("class "+clazz+" not found");
}
}
/**
* Invokes the specified static method if it exists.
*
* @param clazz The class on which to invoke the method.
* @param methodName The name of the method.
* @param types The parameter types.
* @param values The parameter values.
* @return The return value of the method.
* @return NoSuchMethodException if the method does not exist or is not accessible.
*/
public static Object invokeStatic(Class clazz, String methodName,
Class[] types, Object[] values)
throws NoSuchMethodException {
try {
Method method = clazz.getMethod(methodName, types);
Object result = method.invoke(null, values);
return result;
} catch (IllegalAccessException e) {
throw new NoSuchMethodException(methodName+" is not accessible");
} catch (InvocationTargetException e) {
// The method is not supposed to throw exceptions
throw new InternalError(e.getMessage());
}
}
/**
* Invokes the specified static method if it exists.
*
* @param clazz The class on which to invoke the method.
* @param methodName The name of the method.
* @param types The parameter types.
* @param values The parameter values.
* @return The return value of the method.
* @return NoSuchMethodException if the method does not exist or is not accessible.
*/
public static Object invokeStatic(String clazz, String methodName,
Class[] types, Object[] values)
throws NoSuchMethodException {
try {
return invokeStatic(Class.forName(clazz), methodName, types, values);
} catch (ClassNotFoundException e) {
throw new NoSuchMethodException("class "+clazz+" not found");
}
}
/**
* Invokes the specified static method if it exists.
*
* @param clazz The class on which to invoke the method.
* @param methodName The name of the method.
* @param type The parameter types.
* @param value The parameter values.
* @return The return value of the method.
* @return NoSuchMethodException if the method does not exist or is not accessible.
*/
public static Object invokeStatic(String clazz, String methodName,
Class type, Object value)
throws NoSuchMethodException {
try {
return invokeStatic(Class.forName(clazz), methodName, new Class[] {type}, new Object[] {value});
} catch (ClassNotFoundException e) {
throw new NoSuchMethodException("class "+clazz+" not found");
}
}
/**
* Invokes the specified static method if it exists.
*
* @param clazz The class on which to invoke the method.
* @param methodName The name of the method.
* @param types The parameter types.
* @param values The parameter values.
* @param defaultValue The default value.
* @return The return value of the method or the default value if the method
* does not exist or is not accessible.
*/
public static Object invokeStatic(String clazz, String methodName,
Class[] types, Object[] values, Object defaultValue) {
try {
return invokeStatic(Class.forName(clazz), methodName, types, values);
} catch (ClassNotFoundException e) {
return defaultValue;
} catch (NoSuchMethodException e) {
return defaultValue;
}
}
/**
* Invokes the specified static method if it exists.
*
* @param clazz The class on which to invoke the method.
* @param methodName The name of the method.
* @param type The parameter type.
* @param value The parameter value.
* @return The return value of the method or the default value if the method
* does not exist or is not accessible.
*/
public static Object invokeStatic(Class clazz, String methodName,
Class type, Object value) throws NoSuchMethodException {
return invokeStatic(clazz, methodName, new Class[] {type}, new Object[] {value});
}
/**
* Invokes the specified getter method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
* @param defaultValue This value is returned, if the method does not exist.
* @return The value returned by the getter method or the default value.
*/
public static int invokeGetter(Object obj, String methodName, int defaultValue) {
try {
Method method = obj.getClass().getMethod(methodName, new Class[0]);
Object result = method.invoke(obj, new Object[0]);
return (Integer) result;
} catch (NoSuchMethodException e) {
return defaultValue;
} catch (IllegalAccessException e) {
return defaultValue;
} catch (InvocationTargetException e) {
return defaultValue;
}
}
/**
* Invokes the specified getter method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
* @param defaultValue This value is returned, if the method does not exist.
* @return The value returned by the getter method or the default value.
*/
public static long invokeGetter(Object obj, String methodName, long defaultValue) {
try {
Method method = obj.getClass().getMethod(methodName, new Class[0]);
Object result = method.invoke(obj, new Object[0]);
return (Long) result;
} catch (NoSuchMethodException e) {
return defaultValue;
} catch (IllegalAccessException e) {
return defaultValue;
} catch (InvocationTargetException e) {
return defaultValue;
}
}
/**
* Invokes the specified getter method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
* @param defaultValue This value is returned, if the method does not exist.
* @return The value returned by the getter method or the default value.
*/
public static boolean invokeGetter(Object obj, String methodName, boolean defaultValue) {
try {
Method method = obj.getClass().getMethod(methodName, new Class[0]);
Object result = method.invoke(obj, new Object[0]);
return (Boolean) result;
} catch (NoSuchMethodException e) {
return defaultValue;
} catch (IllegalAccessException e) {
return defaultValue;
} catch (InvocationTargetException e) {
return defaultValue;
}
}
/**
* Invokes the specified getter method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
* @param defaultValue This value is returned, if the method does not exist.
* @return The value returned by the getter method or the default value.
*/
public static Object invokeGetter(Object obj, String methodName, Object defaultValue) {
try {
Method method = obj.getClass().getMethod(methodName, new Class[0]);
Object result = method.invoke(obj, new Object[0]);
return result;
} catch (NoSuchMethodException e) {
return defaultValue;
} catch (IllegalAccessException e) {
return defaultValue;
} catch (InvocationTargetException e) {
return defaultValue;
}
}
/**
* Invokes the specified getter method if it exists.
*
* @param clazz The class on which to invoke the method.
* @param methodName The name of the method.
* @param defaultValue This value is returned, if the method does not exist.
* @return The value returned by the getter method or the default value.
*/
public static boolean invokeStaticGetter(Class clazz, String methodName, boolean defaultValue) {
try {
Method method = clazz.getMethod(methodName, new Class[0]);
Object result = method.invoke(null, new Object[0]);
return (Boolean) result;
} catch (NoSuchMethodException e) {
return defaultValue;
} catch (IllegalAccessException e) {
return defaultValue;
} catch (InvocationTargetException e) {
return defaultValue;
}
}
/**
* Invokes the specified setter method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
*/
public static Object invoke(Object obj, String methodName, boolean newValue)
throws NoSuchMethodException {
try {
Method method = obj.getClass().getMethod(methodName, new Class[] { Boolean.TYPE} );
return method.invoke(obj, new Object[] {newValue});
} catch (IllegalAccessException e) {
throw new NoSuchMethodException(methodName+" is not accessible");
} catch (InvocationTargetException e) {
// The method is not supposed to throw exceptions
throw new InternalError(e.getMessage());
}
}
/**
* Invokes the specified method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
*/
public static Object invoke(Object obj, String methodName, int newValue)
throws NoSuchMethodException {
try {
Method method = obj.getClass().getMethod(methodName, new Class[] { Integer.TYPE} );
return method.invoke(obj, new Object[] {newValue});
} catch (IllegalAccessException e) {
throw new NoSuchMethodException(methodName+" is not accessible");
} catch (InvocationTargetException e) {
// The method is not supposed to throw exceptions
throw new InternalError(e.getMessage());
}
}
/**
* Invokes the specified setter method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
*/
public static Object invoke(Object obj, String methodName, float newValue)
throws NoSuchMethodException {
try {
Method method = obj.getClass().getMethod(methodName, new Class[] { Float.TYPE} );
return method.invoke(obj, new Object[] {newValue});
} catch (IllegalAccessException e) {
throw new NoSuchMethodException(methodName+" is not accessible");
} catch (InvocationTargetException e) {
// The method is not supposed to throw exceptions
throw new InternalError(e.getMessage());
}
}
/**
* Invokes the specified setter method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
*/
public static Object invoke(Object obj, String methodName, Class clazz, Object newValue)
throws NoSuchMethodException {
try {
Method method = obj.getClass().getMethod(methodName, new Class[] { clazz } );
return method.invoke(obj, new Object[] { newValue});
} catch (IllegalAccessException e) {
throw new NoSuchMethodException(methodName+" is not accessible");
} catch (InvocationTargetException e) {
// The method is not supposed to throw exceptions
throw new InternalError(e.getMessage());
}
}
/**
* Invokes the specified setter method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
*/
public static void invokeIfExists(Object obj, String methodName) {
try {
invoke(obj, methodName);
} catch (NoSuchMethodException e) {
// ignore
}
}
/**
* Invokes the specified setter method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
*/
public static void invokeIfExists(Object obj, String methodName, int newValue) {
try {
invoke(obj, methodName, newValue);
} catch (NoSuchMethodException e) {
// ignore
}
}
/**
* Invokes the specified setter method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
*/
public static void invokeIfExists(Object obj, String methodName, float newValue) {
try {
invoke(obj, methodName, newValue);
} catch (NoSuchMethodException e) {
// ignore
}
}
/**
* Invokes the specified method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
*/
public static void invokeIfExists(Object obj, String methodName, boolean newValue) {
try {
invoke(obj, methodName, newValue);
} catch (NoSuchMethodException e) {
// ignore
}
}
/**
* Invokes the specified setter method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
*/
public static void invokeIfExists(Object obj, String methodName, Class parameterClass, Object newValue) {
try {
invoke(obj, methodName, parameterClass, newValue);
} catch (NoSuchMethodException e) {
// ignore
}
}
/**
* Invokes the specified setter method if it exists.
*
* @param obj The object on which to invoke the method.
* @param methodName The name of the method.
*/
public static void invokeIfExistsWithEnum(Object obj, String methodName, String enumClassName, String enumValueName) {
try {
Class enumClass = Class.forName(enumClassName);
Object enumValue = invokeStatic("java.lang.Enum", "valueOf", new Class[] {Class.class, String.class},
new Object[] {enumClass, enumValueName}
);
invoke(obj, methodName, enumClass, enumValue);
} catch (ClassNotFoundException e) {
// ignore
e.printStackTrace();
} catch (NoSuchMethodException e) {
// ignore
e.printStackTrace();
}
}
/**
* Invokes the specified constructor if it exists.
*
* @param clazz The Class on which to invoke the constructor.
* @param types The parameter types of the constructor.
* @param values The parameter values of the constructor.
*/
public static Object newInstance(Class clazz, Class[] types, Object[] values)
throws NoSuchMethodException, InstantiationException, IllegalAccessException, InvocationTargetException {
return clazz.getConstructor(types).newInstance(values);
};
}