cd.go.plugin.base.ResourceReader Maven / Gradle / Ivy

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/*
 * Copyright 2019 Thoughtworks, Inc.
 *
 * 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.
 */

package cd.go.plugin.base;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;

public class ResourceReader {
    public static String readResource(String resourceFile) {
        return new String(readResourceBytes(resourceFile), StandardCharsets.UTF_8);
    }

    public static byte[] readResourceBytes(String resourceFile) {
        try (InputStream in = ResourceReader.class.getResourceAsStream(resourceFile)) {
            return readFully(in);
        } catch (IOException e) {
            throw new RuntimeException("Could not find resource " + resourceFile, e);
        }
    }

    private static byte[] readFully(InputStream input) throws IOException {
        byte[] buffer = new byte[8192];
        int bytesRead;
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        while ((bytesRead = input.read(buffer)) != -1) {
            output.write(buffer, 0, bytesRead);
        }
        return output.toByteArray();
    }
}