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/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2019 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END=========================================================
 */

package org.openecomp.sdc.be.utils;

import com.google.common.io.Resources;

import java.io.IOException;
import java.net.URL;
import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;

/**
 * A set of helper method for fixture files.
 */
public class FixtureHelpers {

    private FixtureHelpers() {
        // singleton
    }

    /**
     * Reads the given fixture file from the classpath (e. g. {@code src/test/resources})
     * and returns its contents as a UTF-8 string.
     *
     * @param filename the filename of the fixture file
     * @return the contents of {@code src/test/resources/{filename}}
     * @throws IllegalArgumentException if an I/O error occurs.
     */
    public static String fixture(String filename) {
        return fixture(filename, StandardCharsets.UTF_8);
    }

    /**
     * Reads the given fixture file from the classpath (e. g. {@code src/test/resources})
     * and returns its contents as a string.
     *
     * @param filename the filename of the fixture file
     * @param charset the character set of {@code filename}
     * @return the contents of {@code src/test/resources/{filename}}
     * @throws IllegalArgumentException if an I/O error occurs.
     */
    private static String fixture(String filename, Charset charset) {
        try {
            URL url = Resources.getResource(filename);
            String text = Resources.toString(url, charset);
            return text.trim();
        }
        catch (IOException e) {
            throw new IllegalArgumentException(e);
        }
    }
}