se.softhouse.common.testlib.ResourceLoader.java Source code

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Here is the source code for se.softhouse.common.testlib.ResourceLoader.java

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/* Copyright 2013 Jonatan Jnsson
 *
 *    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 se.softhouse.common.testlib;

import static com.google.common.base.Charsets.UTF_8;

import java.io.IOException;
import java.net.URL;

import javax.annotation.concurrent.Immutable;

import com.google.common.io.Resources;

/**
 * Aids tests with loading resource texts. These texts are often the expected result from some
 * operation.
 */
@Immutable
public final class ResourceLoader {
    private ResourceLoader() {
    }

    /**
     * Loads a file and reads it as an {@link com.google.common.base.Charsets#UTF_8 UTF_8} file.
     * {@code resourceName} must start with a "/"
     * 
     * @return the file as a string
     * @throws IllegalArgumentException if {@code resourceName} can't be found/loaded
     */
    public static String get(String resourceName) {
        URL resourcePath = Resources.getResource(ResourceLoader.class, resourceName);
        String fileContent = null;
        try {
            fileContent = Resources.toString(resourcePath, UTF_8);
        } catch (IOException e) {
            throw new IllegalArgumentException("Failed to load: " + resourcePath, e);
        }
        return fileContent;
    }
}