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A library for settings and parameterization of objects. Key features are support for data types, help for settings and parameters, annotations for ease of use. Settings and parameters both are Clonable and Serializable. More features for settings such as parsing a settingsfile, being observable, readonliness, caching etc. are available. The library contains javacc generated parsers for syntax support for properties, multi valued properties, parameterized objects and multi valued parameters.

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/*
 * Copyright 2018 Fryske Akademy.
 *
 * 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.
 */
package com.vectorprint.configuration.cdi;

import com.vectorprint.configuration.NoValueException;
import jakarta.annotation.Priority;
import jakarta.enterprise.inject.spi.InjectionPoint;
import jakarta.interceptor.AroundInvoke;
import jakarta.interceptor.Interceptor;
import jakarta.interceptor.InvocationContext;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.lang.reflect.Field;
import java.lang.reflect.Method;

/**
 *
 * @author eduard
 */
@CheckInjection
@Interceptor
@Priority(Interceptor.Priority.APPLICATION)
class ChecksInterceptor {
    private final static Logger log = LoggerFactory.getLogger(ChecksInterceptor.class);

   @AroundInvoke
   public Object check(InvocationContext ctx) throws Exception {
       InjectionPoint ip = (InjectionPoint) ctx.getParameters()[0];
       boolean ok = ip.getMember() instanceof Field || (ip.getMember() instanceof Method m && m.getParameterCount() == 1);
       if (!ok) {
           throw new IllegalStateException("Method %s#%s must have one argument".formatted(ip.getMember().getDeclaringClass(),ip.getMember().getName()));
       }
       final Property property = CDIProperties.fromIp(ip);
       if (property != null) {
           final boolean required = property.required();
           try {
               return ctx.proceed();
           } catch (NoValueException ex) { // thrown by Settings#handleNoValue
               if (required) throw ex;
               else return null;
           }
       } else {
           return null;
       }
   }    
}