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package com.ctp.cdi.query.util;

import java.lang.reflect.Method;
import java.text.MessageFormat;
import java.util.Collection;

/**
 *
 * @author thomashug
 */
public final class QueryUtils {
    
    private QueryUtils() {
    }
    
    private static final String KEYWORD_SPLITTER = "({0})(?=[A-Z])";
    
    public static String[] splitByKeyword(String query, String keyword) {
        return query.split(MessageFormat.format(KEYWORD_SPLITTER, keyword));
    }
    
    public static String uncapitalize(String value) {
        if (isEmpty(value)) {
            return null;
        }
        if (value.length() == 1) {
            return value.toLowerCase();
        }
        return value.substring(0, 1).toLowerCase() + value.substring(1);
    }
    
    public static boolean isEmpty(String text) {
        return text == null || "".equals(text);
    }
    
    public static boolean isNotEmpty(String text) {
        return !isEmpty(text);
    }
    
    public static boolean isEmpty(Collection collection) {
        return collection == null || collection.isEmpty();
    }
    
    public static boolean isEmpty(Object[] array) {
        return array == null || array.length == 0;
    }
    
    public static boolean isString(Object value) {
        return value != null && value instanceof String;
    }
    
    public static boolean contains(Class clazz, Method method) {
        return extract(clazz, method) != null;
    }
    
    public static Method extract(Class clazz, Method method) {
        try {
            String name = method.getName();
            return clazz.getMethod(name, method.getParameterTypes());
        } catch (NoSuchMethodException e) {
            return null;
        }
    }
}