Synnefo » Pithos Web Client

package gr.grnet.pithos.web.client;

import com.google.gwt.json.client.JSONArray;

import com.google.gwt.json.client.JSONString;

import java.util.ArrayList;

import java.util.Collections;

import java.util.HashMap;

import java.util.List;

/**

 * Helper methods.

 */

public final class Helpers {

    private Helpers() {}

    public static boolean isEmptySafe(CharSequence s) {

        return s == null || s.length() == 0;

    }

    public static <K, V> HashMap<K, V> copyHashMap(HashMap<K, V> map) {

        assert map != null;

        return new HashMap<K, V>(map);

    }

    public static <T> List<T> safeList(List<T> list) {

        if(list == null) {

            return new ArrayList<T>();

        }

        return list;

    }

    public static <T> List<T> toList(T ...items) {

        final List<T> list = new ArrayList<T>();

        Collections.addAll(list, items);

        return list;

    }

    public static JSONArray listToJSONArray(List<String> list) {

        final JSONArray jsonArray = new JSONArray();

        if(list == null) {

            return jsonArray;

        }

        for(int i = 0; i < list.size(); i++) {

            final JSONString jsonString = new JSONString(list.get(i));

            jsonArray.set(i, jsonString);

        }

        return jsonArray;

    }

    public static String stripTrailing(String s, String trailing) {

        while(s.endsWith(trailing)) {

            s = s.substring(0, s.length() - trailing.length());

        }

        return s;

    }

    public static String upToIncludingLastPart(String s, String part) {

        int index = s.lastIndexOf(part);

        if(index == -1) {

            return s;

        }

        return s.substring(0, index + part.length());

    }

}