/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 2010-2015 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 * When distributing the software, include this License Header Notice in each
 * file and include the License file at packager/legal/LICENSE.txt.
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 * GPL Classpath Exception:
 * Oracle designates this particular file as subject to the "Classpath"
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 * Modifications:
 * If applicable, add the following below the License Header, with the fields
 * enclosed by brackets [] replaced by your own identifying information:
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 */
package org.glassfish.jersey.tests.e2e.json;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.Collection;

/**
 * @author Jakub Podlesak (jakub.podlesak at oracle.com)
 * @author Michal Gajdos
 */
public class JsonTestHelper {

    public static String getResourceAsString(String prefix, String resource) throws IOException {
        return getEntityAsString(Thread.currentThread().getContextClassLoader().getResourceAsStream(prefix + resource));
    }

    public static String getEntityAsString(InputStream inputStream) throws IOException {
        Reader reader = new InputStreamReader(inputStream);
        StringBuilder sb = new StringBuilder();
        char[] c = new char[1024];
        int l;
        while ((l = reader.read(c)) != -1) {
            sb.append(c, 0, l);
        }
        return sb.toString();
    }

    public static <T> T createTestInstance(Class<T> clazz) {
        try {
            Method createMethod = clazz.getDeclaredMethod("createTestInstance");
            //noinspection unchecked
            return (T) createMethod.invoke(clazz);
        } catch (Exception ex) {
            return null;
        }
    }

    public static boolean isCollectionEmpty(final Collection<?> collection) {
        return collection == null || collection.isEmpty();
    }

    public static <T> boolean areCollectionsEqual(final Collection<T> collection1, final Collection<T> collection2) {
        return collection1 == collection2
                || (isCollectionEmpty(collection1) && isCollectionEmpty(collection2))
                || (collection1 != null && collection1.equals(collection2));
    }

    public static boolean isArrayEmpty(final Object[] array) {
        return array == null || array.length == 0;
    }

    public static <T> boolean areArraysEqual(final T[] array1, final T[] array2) {
        return array1 == array2
                || (isArrayEmpty(array1) && isArrayEmpty(array2))
                || Arrays.equals(array1, array2);
    }

}
