/**
 * ============LICENSE_START====================================================
 * org.onap.aaf
 * ===========================================================================
 * Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
 * ===========================================================================
 * 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.
 * ============LICENSE_END====================================================
 *
 */

package org.onap.aaf.cadi.config;

import java.lang.reflect.Method;

import org.onap.aaf.cadi.Access;
import org.onap.aaf.cadi.Access.Level;

public interface Get {
    public String get(String name, String def, boolean print);
    
    
    /**
     * A class for Getting info out of "JavaBean" format
     * @author Jonathan
     *
     */
    public static class Bean implements Get {
        private Object bean;
        private Class<?> bc;
        private Class<?>[] params;
        private Object[] args;
        
        public Bean(Object bean) {
            this.bean = bean;
            bc = bean.getClass();
            params = new Class<?>[0]; // note, this will allow to go out of scope after config
            args = new Object[0];
        }
        
        public String get(String name, String def, boolean print) {
            String str = null;
            String gname = "get"+Character.toUpperCase(name.charAt(0))+name.substring(1);
            try {
                Method meth = bc.getMethod(gname, params);
                Object obj = meth.invoke(bean, args);
                str = obj==null?null:obj.toString(); // easy string convert... 
            } catch (Exception e) {
            }
            
            // Take def if nothing else
            if(str==null) {
                str = def;
                // don't log defaults
            } else {
                str = str.trim(); // this is vital in Property File based values, as spaces can hide easily
            }
            // Note: Can't log during configuration
            return str;
        }
    }

    public static Get NULL = new Get() {
        public String get(String name, String def, boolean print) {
            return def;
        }
    };

    public static class AccessGet implements Get {
        private Access access;
        public AccessGet(Access access) {
            this.access = access;
        }
        public String get(String name, String def, boolean print) {
            String gotten = access.getProperty(name, def);
            if(print) {
                if(gotten == null) {
                    access.log(Level.INIT,name, "is not set");
                } else {
                    access.log(Level.INIT,name, "is set to", gotten);
                }
            }
            return gotten;
        }
    }

}