001    /*
002     * Copyright 2010-2013 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package com.sampullara.cli;
018    
019    import com.intellij.util.containers.ComparatorUtil;
020    import org.jetbrains.annotations.NotNull;
021    
022    import java.lang.reflect.Field;
023    
024    public class ArgumentUtils {
025    
026        private ArgumentUtils() {}
027    
028        @NotNull
029        public static <T> String convertArgumentsToString(T arguments, T defaultArguments) {
030            StringBuilder result = new StringBuilder();
031            convertArgumentsToString(arguments, defaultArguments, arguments.getClass(), result);
032            return result.toString();
033        }
034    
035        public static <T> void convertArgumentsToString(T arguments, T defaultArguments, Class clazz, StringBuilder result) {
036            Class superClazz = clazz.getSuperclass();
037            if (superClazz != null) {
038                convertArgumentsToString(arguments, defaultArguments, superClazz, result);
039            }
040    
041            for (Field field : clazz.getDeclaredFields()) {
042                Argument argument = field.getAnnotation(Argument.class);
043                if (argument == null) continue;
044    
045                Object value;
046                Object defaultValue;
047                try {
048                    value = field.get(arguments);
049                    defaultValue = field.get(defaultArguments);
050                }
051                catch (IllegalAccessException ignored) {
052                    // skip this field
053                    continue;
054                }
055    
056                if (ComparatorUtil.equalsNullable(value, defaultValue)) continue;
057    
058                String name = Args.getAlias(argument);
059                if (name == null) {
060                    name = Args.getName(argument, field);
061                }
062    
063                result.append("-").append(name).append(" ");
064    
065                Class<?> fieldType = field.getType();
066                if (fieldType != boolean.class && fieldType != Boolean.class) {
067                    result.append(value).append(" ");
068                }
069            }
070        }
071    
072    }