/*
* Copyright 2010 JBoss 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 org.drools.planner.examples.common.persistence;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.io.InputStream;
import com.thoughtworks.xstream.XStream;
import com.thoughtworks.xstream.converters.reflection.FieldDictionary;
import com.thoughtworks.xstream.converters.reflection.NativeFieldKeySorter;
import com.thoughtworks.xstream.converters.reflection.PureJavaReflectionProvider;
import org.drools.planner.core.solution.Solution;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public abstract class XstreamSolutionDaoImpl implements SolutionDao {
protected final transient Logger logger = LoggerFactory.getLogger(getClass());
private XStream xStream;
private String dirName;
private File dataDir;
public XstreamSolutionDaoImpl(String dirName, Class... xstreamAnnotations) {
this.dirName = dirName;
dataDir = new File("data/" + dirName);
// TODO From Xstream 1.3.3 that KeySorter will be the default. See http://jira.codehaus.org/browse/XSTR-363
xStream = new XStream(new PureJavaReflectionProvider(new FieldDictionary(new NativeFieldKeySorter())));
xStream.setMode(XStream.ID_REFERENCES);
xStream.processAnnotations(xstreamAnnotations);
}
public String getDirName() {
return dirName;
}
public File getDataDir() {
return dataDir;
}
public Solution readSolution(File file) {
Reader reader = null;
try {
// xStream.fromXml(InputStream) does not use UTF-8
reader = new InputStreamReader(new FileInputStream(file), "UTF-8");
Solution solution = (Solution) xStream.fromXML(reader);
logger.info("Loaded: {}", file);
return solution;
} catch (IOException e) {
throw new IllegalArgumentException("Could not read file: " + file, e);
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
logger.warn("Problem closing file (" + file + ")", e);
}
}
}
}
public Solution readSolution(InputStream in) {
Reader reader = null;
try {
// xStream.fromXml(InputStream) does not use UTF-8
reader = new InputStreamReader(in, "UTF-8");
Solution solution = (Solution) xStream.fromXML(reader);
return solution;
} catch (IOException e) {
throw new IllegalArgumentException("Could not read from InputStream: " + in, e);
} finally {
if (reader != null) {
try {
reader.close();
} catch (IOException e) {
logger.warn("Problem closing InputStream (" + in + ")", e);
}
}
}
}
public void writeSolution(Solution solution, File file) {
Writer writer = null;
try {
// xStream.toXml(OutputStream) does not use UTF-8
writer = new OutputStreamWriter(new FileOutputStream(file), "UTF-8");
xStream.toXML(solution, writer);
logger.info("Saved: {}", file);
} catch (IOException e) {
throw new IllegalArgumentException("Could not write file (" + file + ")", e);
} finally {
if (writer != null) {
try {
writer.close();
} catch (IOException e) {
logger.warn("Problem closing file (" + file + ")", e);
}
}
}
}
}