io.pelle.mango.client.base.util.CollectionUtils.java Source code

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Here is the source code for io.pelle.mango.client.base.util.CollectionUtils.java

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/**
 * Copyright (c) 2013 Christian Pelster.
 * 
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors:
 *     Christian Pelster - initial API and implementation
 */
package io.pelle.mango.client.base.util;

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

import com.google.common.base.Predicate;
import com.google.common.collect.Iterables;

public class CollectionUtils {

    public static <T> List<T> copyToArrayList(List<T> fromList) {

        ArrayList<T> result = new ArrayList<T>();

        for (T listItem : fromList) {
            result.add(listItem);
        }

        return result;
    }

    public static HashMap<String, String> copyMap(Map<String, Object> map) {
        HashMap<String, String> result = new HashMap<String, String>();

        for (Map.Entry<String, Object> entry : map.entrySet()) {
            String value = null;

            if (entry.getValue() != null) {
                value = entry.getValue().toString();
            }

            result.put(entry.getKey(), value);
        }

        return result;
    }

    public static HashMap<String, Object> getMap(String key1, Object value1) {
        return getMap(key1, value1, null, null, null, null);
    }

    public static HashMap<String, Object> getMap(String key1, Object value1, String key2, Object value2) {
        return getMap(key1, value1, key2, value2, null, null);
    }

    // no varargs in gwt sadly
    public static HashMap<String, Object> getMap(String key1, Object value1, String key2, Object value2,
            String key3, Object value3) {
        HashMap<String, Object> result = new HashMap<String, Object>();

        if (key1 != null) {
            result.put(key1, value1);
        }

        if (key2 != null) {
            result.put(key2, value2);
        }

        if (key3 != null) {
            result.put(key3, value3);
        }

        return result;
    }

    public static <T> T addIfNotExists(Collection<T> collection, Predicate<T> predicate, T element) {

        if (!Iterables.contains(collection, predicate)) {
            collection.add(element);
        }

        return element;
    }

}