RandomSec/main/src/com/google/gridworks/io/ProjectMetadataUtilities.java

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package com.google.gridworks.io;
import java.io.File;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.OutputStreamWriter;
import java.io.Writer;
import org.json.JSONObject;
import org.json.JSONTokener;
import org.json.JSONWriter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import com.google.gridworks.ProjectMetadata;
public class ProjectMetadataUtilities {
final static Logger logger = LoggerFactory.getLogger("project_metadata_utilities");
public static void save(ProjectMetadata projectMeta, File projectDir) throws Exception {
File tempFile = new File(projectDir, "metadata.temp.json");
try {
saveToFile(projectMeta, tempFile);
} catch (Exception e) {
e.printStackTrace();
logger.warn("Failed to save project metadata");
return;
}
File file = new File(projectDir, "metadata.json");
File oldFile = new File(projectDir, "metadata.old.json");
if (file.exists()) {
file.renameTo(oldFile);
}
tempFile.renameTo(file);
if (oldFile.exists()) {
oldFile.delete();
}
}
protected static void saveToFile(ProjectMetadata projectMeta, File metadataFile) throws Exception {
Writer writer = new OutputStreamWriter(new FileOutputStream(metadataFile));
try {
JSONWriter jsonWriter = new JSONWriter(writer);
projectMeta.write(jsonWriter);
} finally {
writer.close();
}
}
static public ProjectMetadata load(File projectDir) {
try {
return loadFromFile(new File(projectDir, "metadata.json"));
} catch (Exception e) {
}
try {
return loadFromFile(new File(projectDir, "metadata.temp.json"));
} catch (Exception e) {
}
try {
return loadFromFile(new File(projectDir, "metadata.old.json"));
} catch (Exception e) {
}
return null;
}
static protected ProjectMetadata loadFromFile(File metadataFile) throws Exception {
FileReader reader = new FileReader(metadataFile);
try {
JSONTokener tokener = new JSONTokener(reader);
JSONObject obj = (JSONObject) tokener.nextValue();
return ProjectMetadata.loadFromJSON(obj);
} finally {
reader.close();
}
}
}