ResourceSet.java
/**
* Copyright (c) 2018, RTE (http://www.rte-france.com)
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
* SPDX-License-Identifier: MPL-2.0
*/
package com.powsybl.commons.datasource;
import java.io.InputStream;
import java.util.Arrays;
import java.util.List;
import java.util.Objects;
/**
* @author Geoffroy Jamgotchian {@literal <geoffroy.jamgotchian at rte-france.com>}
*/
public class ResourceSet {
private final String dir;
private final List<String> fileNames;
public ResourceSet(String dir, String... fileNames) {
this(dir, Arrays.asList(fileNames));
}
public ResourceSet(String dir, List<String> fileNames) {
this.dir = Objects.requireNonNull(dir);
this.fileNames = Objects.requireNonNull(fileNames);
// check resources exist
for (String fileName : fileNames) {
String resourceName = getResourceName(dir, fileName);
if (getClass().getResourceAsStream(resourceName) == null) {
throw new IllegalArgumentException("Resource '" + resourceName + "' not found");
}
}
}
private static String getResourceName(String dir, String fileName) {
return dir.endsWith("/") ? dir + fileName : dir + "/" + fileName;
}
public String getDir() {
return dir;
}
public List<String> getFileNames() {
return fileNames;
}
public boolean exists(String fileName) {
Objects.requireNonNull(fileName);
return fileNames.contains(fileName);
}
public InputStream newInputStream(String fileName) {
Objects.requireNonNull(fileName);
if (!fileNames.contains(fileName)) {
throw new IllegalArgumentException("File '" + fileName + "' not found");
}
return getClass().getResourceAsStream(getResourceName(dir, fileName));
}
}