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/*-
* ============LICENSE_START=======================================================
* SDC
* ================================================================================
* Copyright (C) 2017 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.core.utilities.file;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;
import java.util.Optional;
import java.util.Set;
import java.util.function.Function;
import org.apache.commons.collections4.MapUtils;
public class FileContentHandler {
private Map<String, byte[]> files = new HashMap<>();
/**
* Gets file content.
*
* @param fileName the file name
* @return the file content
*/
public InputStream getFileContent(String fileName) {
byte[] content = files.get(fileName);
if (content == null || content.length == 0) {
return null;
}
return new ByteArrayInputStream(content);
}
/**
* Applies a business logic to a file's content while taking care of all retrieval logic.
*
* @param fileName name of a file inside this content handler.
* @param processor the business logic to work on the file's input stream, which may not be set
* (check the {@link Optional} if no such file can be found
* @param <T> return type, may be {@link java.lang.Void}
* @return result produced by the processor
*/
public <T> T processFileContent(String fileName, Function<Optional<InputStream>, T> processor) {
// do not throw IOException to mimic the existing uses of getFileContent()
try (InputStream contentInputStream = getFileContent(fileName)) {
return processor.apply(Optional.ofNullable(contentInputStream));
} catch (IOException e) {
throw new ProcessingException("Failed to process file: " + fileName, e);
}
}
public void addFile(String fileName, byte[] content) {
files.put(fileName, content);
}
public void addFile(String fileName, InputStream is) {
files.put(fileName, FileUtils.toByteArray(is));
}
public Map<String, byte[]> getFiles() {
return files;
}
public void setFiles(Map<String, byte[]> files) {
this.files = files;
}
public void setFiles(FileContentHandler extFiles) {
extFiles.getFileList().forEach(fileName -> this.addFile(fileName, extFiles.getFileContent(fileName)));
}
public Set<String> getFileList() {
return files.keySet();
}
public void putAll(Map<String, byte[]> files) {
this.files = files;
}
public void addAll(FileContentHandler other) {
this.files.putAll(other.files);
}
public boolean isEmpty() {
return MapUtils.isEmpty(this.files);
}
public void remove(String fileName) {
files.remove(fileName);
}
public boolean containsFile(String fileName) {
return files.containsKey(fileName);
}
/**
* An application-specific runtime exception
*/
private static class ProcessingException extends RuntimeException {
public ProcessingException() {
super();
}
public ProcessingException(String message) {
super(message);
}
public ProcessingException(Throwable cause) {
super(cause);
}
public ProcessingException(String msg, Throwable cause) {
super(msg, cause);
}
}
}
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