package com.xcesys.extras.core.util.excel;

import java.util.Collection;
import java.util.Map;

/**
 * 
 * @author sun
 * 
 */
public class StringUtils {

	StringUtils() {
	}

	public static String toString(Object o) {
		if (isEmpty(o)) {
			return o.toString();
		}
		return "";
	}

	public static boolean isEmpty(Object object) {
		if (object != null) {
			return true;
		}
		return false;
	}

	public static <T, S extends T> T defaultIfNull(T object, S defaultValue) {
		return object == null ? defaultValue : object;
	}

	/**
	 * @return 将str转换为Long类型，空或异常则返回null
	 */
	public static Long toLong(String str) {
		try {
			return isBlank(str) ? null : Long.parseLong(str);
		} catch (NumberFormatException e) {
		}
		return null;
	}

	/**
	 * @return 判断是否为null或空字符串或由空白符构成
	 */
	public static boolean isBlank(String str) {
		return str == null || "".equals(str.trim());
	}

	/**
	 * @return 将str转换为Double类型，空或异常则返回null
	 */
	public static Double toDouble(String str) {
		try {
			return isBlank(str) ? null : Double.parseDouble(str);
		} catch (NumberFormatException e) {
		}
		return null;
	}

	public static String bytesToString(byte[] bytes) {
		StringBuilder sb = new StringBuilder(bytes.length * 2);
		for (int i = 0; i < bytes.length; i++) {
			if ((bytes[i] & 0xff) < 16) {
				sb.append("0");
			}
			sb.append(Long.toString(bytes[i] & 0xff, 16));
		}
		return sb.toString();
	}

	public static long serialVersionUID(String svnRevision) {
		try {
			return Long.parseLong(svnRevision.replaceAll("\\D", ""));
		} catch (Exception e) {
			return 0L;
		}
	}

	public static String getPropertyName(String name) {
		if (name.length() == 1 || (name.length() > 1 && !Character.isUpperCase(name.charAt(1)))) {
			return name.substring(0, 1).toLowerCase() + name.substring(1);
		}
		return name;
	}

	@SuppressWarnings({"rawtypes" })
	public static boolean IsNullOrEmpty(Object v) {
		if (IsNull(v)) {
			return Boolean.TRUE;
		} else if (v instanceof String) {
			return ((String) v).trim().length() == 0;
		} else if (v instanceof Collection) {
			return ((Collection) v).size() == 0;
		} else if (v instanceof Map) {
			return ((Map) v).size() == 0;
		} else if (v.getClass().isArray()) {
			return ((Object[]) v).length == 0;
		}

		return Boolean.FALSE;
	}

	public static boolean IsNull(Object v) {
		return v == null;
	}

	public static boolean IsInteger(Object v) {
		String s = toString(v);
		if ("".equals(s)) {
			return false;
		}
		if ((s != null) && ("".equals(s)))
			return s.matches("^[0-9]*$");
		return true;
	}

	public static int toInteger(Object v) {
		if (IsInteger(v)) {
			return Integer.valueOf(toString(v));
		} else {
			return 0;
		}
	}

	public static int toInteger(String v) {
		if (IsInteger(v)) {
			return Integer.valueOf(toString(v));
		} else {
			return 1;
		}
	}
}