ListHelper.java

package org.test4j.tools.commons;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.Map;

import org.test4j.tools.commons.ArrayHelper;

@SuppressWarnings({ "rawtypes", "unchecked" })
public class ListHelper {

	/**
	 * 将对象转换为列表
	 * 
	 * @param objects
	 * @return
	 */
	public static <T> List toList(T... objects) {
		List list = new ArrayList();
		if (objects == null || objects.length == 0) {
			return list;
		}
		if (objects.length == 1) {
			list = toList(objects[0], false);
			return list;
		} else {
			for (Object o : objects) {
				list.add(o);
			}
			return list;
		}
	}

	/**
	 * 把对象转换为列表
	 * 
	 * @param object
	 * @param withMap
	 *            如果对象是map，是否把map的值转换为列表
	 * @return
	 */
	public static List toList(Object object, boolean withMap) {
		List list = new ArrayList();
		if (object == null) {
			list.add(null);
			return list;
		}
		if (object instanceof Collection) {
			list.addAll((Collection) object);
			return list;
		} else if (object.getClass().isArray()) {
			Object[] array = ArrayHelper.convertPrimitiveArrayToObjectArray(object);
			for (Object item : array) {
				list.add(item);
			}
			return list;
		} else if (withMap && object instanceof Map) {
			Collection values = ((Map) object).values();
			list.addAll(values);
			return list;
		} else {
			list.add(object);
			return list;
		}
	}

	// boolean
	// byte
	// char
	// short int long
	// float double
	public static List toList(char values[]) {
		List objs = new ArrayList();
		for (Character value : values) {
			objs.add(value);
		}
		return objs;
	}

	public static List toList(float values[]) {
		List objs = new ArrayList();
		for (Float value : values) {
			objs.add(value);
		}
		return objs;
	}

	public static List toList(long values[]) {
		List objs = new ArrayList();
		for (Long value : values) {
			objs.add(value);
		}
		return objs;
	}

	public static List toList(short values[]) {
		List objs = new ArrayList();
		for (Short value : values) {
			objs.add(value);
		}
		return objs;
	}

	public static List toList(int values[]) {
		List objs = new ArrayList();
		for (Integer value : values) {
			objs.add(value);
		}
		return objs;
	}

	public static List toList(double values[]) {
		List objs = new ArrayList();
		for (Double value : values) {
			objs.add(value);
		}
		return objs;
	}

	public static List toList(boolean values[]) {
		List objs = new ArrayList();
		for (Boolean value : values) {
			objs.add(value);
		}
		return objs;
	}

	public static List toList(byte values[]) {
		List objs = new ArrayList();
		for (Byte value : values) {
			objs.add(value);
		}
		return objs;
	}

	public static boolean isCollection(Object o) {
		if (o == null) {
			return false;
		}
		return o instanceof Collection<?>;
	}

	public static String toString(List list) {
		if (list == null) {
			return "null";
		}
		StringBuilder buff = new StringBuilder("[");
		boolean first = true;
		for (Object o : list) {
			if (first) {
				first = false;
			} else {
				buff.append(", ");
			}
			buff.append(String.valueOf(o));
		}
		buff.append("]");
		return buff.toString();
	}
}