org.smooks.cartridges.persistence.scribe.reflection.LookupMethod Maven / Gradle / Ivy
/*-
* ========================LICENSE_START=================================
* Scribe :: Core
* %%
* Copyright (C) 2020 Smooks
* %%
* Licensed under the terms of the Apache License Version 2.0, or
* the GNU Lesser General Public License version 3.0 or later.
*
* SPDX-License-Identifier: Apache-2.0 OR LGPL-3.0-or-later
*
* ======================================================================
*
* Licensed 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.
*
* ======================================================================
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* =========================LICENSE_END==================================
*/
package org.smooks.cartridges.persistence.scribe.reflection;
import org.smooks.annotation.AnnotatedMethod;
import org.smooks.annotation.AnnotationManager;
import org.smooks.assertion.AssertArgument;
import org.smooks.scribe.annotation.Param;
import java.lang.annotation.Annotation;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
/**
* @author maurice
*
* TODO: implement type checking for primative types...
*/
public class LookupMethod {
final Method method;
Map parameterPositions;
private boolean namedParameters;
/**
*
*/
public LookupMethod(final Method method) {
AssertArgument.isNotNull(method, "method");
this.method = method;
analyzeParameters();
}
/**
*
*/
private void analyzeParameters() {
final AnnotatedMethod aMethod = AnnotationManager.getAnnotatedClass(method.getDeclaringClass()).getAnnotatedMethod(method);
final Annotation[][] parameterAnnotations = aMethod.getParameterAnnotations();
int parameterSize = aMethod.getMethod().getParameterTypes().length;
for (int i = 0; i < parameterAnnotations.length; i++) {
for (final Annotation annotation : parameterAnnotations[i]) {
if (Param.class.equals(annotation.annotationType())) {
namedParameters = true;
final Param param = (Param) annotation;
final String name = param.value().trim();
if (name.length() == 0) {
throw new RuntimeException("Illegal empty parameter value encounterd on parameter " + i
+ " of method '" + method + "' from class '" + method.getDeclaringClass().getName() + "'.");
}
if (parameterPositions == null) {
parameterPositions = new HashMap();
}
parameterPositions.put(param.value(), i);
break;
}
}
}
if (namedParameters && parameterPositions.size() != parameterSize) {
throw new RuntimeException("Not all the parameters of the method '" + method.getDeclaringClass().getName() + "." + method + "' are annotated with the '" + Param.class.getName() + "' annotation."
+ " All the parameters of the method need to be have the '" + Param.class.getName() + "' annotation when using the annotation on a method.");
}
}
/* (non-Javadoc)
* @see org.smooks.scribe.method.DAOMethod#invoke()
*
*
*/
public Object invoke(final Object obj, final Map parameters) {
if (!namedParameters) {
throw new IllegalStateException("This Lookup Method doesn't have name parameters and there for can't be invoked with a parameter Map.");
}
Object[] args = new Object[parameterPositions.size()];
//TODO: evaluate a faster way to map the arguments but which is equally safe
for (final Entry parameterEntry : parameters.entrySet()) {
String parameterName = parameterEntry.getKey();
final Integer position = parameterPositions.get(parameterName);
if (position == null) {
throw new RuntimeException("Parameter with the name " + parameterName + " isn't found on the method '" + method + "' of the class '" + method.getDeclaringClass().getName() + "'");
}
args[position] = parameterEntry.getValue();
}
return invoke(obj, args);
}
/**
* @param obj
* @param args
* @return
*/
public Object invoke(final Object obj, Object... args) {
try {
return method.invoke(obj, args);
} catch (final IllegalArgumentException e) {
throw new RuntimeException("The method '" + method + "' of the class '" + method.getDeclaringClass().getName() + "' threw an exception, while invoking it with the object '" + obj + "'.", e);
} catch (final IllegalAccessException e) {
throw new RuntimeException("The method '" + method + "' of the class '" + method.getDeclaringClass().getName() + "' threw an exception, while invoking it with the object '" + obj + "'.", e);
} catch (final InvocationTargetException e) {
throw new RuntimeException("The method '" + method + "' of the class '" + method.getDeclaringClass().getName() + "' threw an exception, while invoking it with the object '" + obj + "'.", e);
}
}
}