/*
* 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.config;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
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.apache.commons.io.IOUtils;
import org.drools.planner.config.solver.SolverConfig;
import org.drools.planner.core.Solver;
/**
* XML based configuration that builds a {@link Solver}.
* @see SolverFactory
*/
public class XmlSolverFactory implements SolverFactory {
public static XStream buildXstream() {
XStream xStream = new XStream(new PureJavaReflectionProvider(new FieldDictionary(new NativeFieldKeySorter())));
xStream.setMode(XStream.ID_REFERENCES);
xStream.processAnnotations(SolverConfig.class);
return xStream;
}
private XStream xStream;
private SolverConfig solverConfig = null;
public XmlSolverFactory() {
xStream = buildXstream();
}
public XmlSolverFactory(String resource) {
this();
configure(resource);
}
public void addXstreamAnnotations(Class... xstreamAnnotations) {
xStream.processAnnotations(xstreamAnnotations);
}
// ************************************************************************
// Worker methods
// ************************************************************************
public XmlSolverFactory configure(String resource) {
InputStream in = getClass().getResourceAsStream(resource);
if (in == null) {
throw new IllegalArgumentException("The solver configuration (" + resource + ") does not exist.");
}
return configure(in);
}
public XmlSolverFactory configure(InputStream in) {
Reader reader = null;
try {
reader = new InputStreamReader(in, "UTF-8");
return configure(reader);
} catch (UnsupportedEncodingException e) {
throw new IllegalStateException("This vm does not support UTF-8 encoding.", e);
} finally {
IOUtils.closeQuietly(reader);
IOUtils.closeQuietly(in);
}
}
public XmlSolverFactory configure(Reader reader) {
solverConfig = (SolverConfig) xStream.fromXML(reader);
return this;
}
public SolverConfig getSolverConfig() {
if (solverConfig == null) {
throw new IllegalStateException("The solverConfig (" + solverConfig + ") is null," +
" call configure(...) first.");
}
return solverConfig;
}
public Solver buildSolver() {
if (solverConfig == null) {
throw new IllegalStateException("The solverConfig (" + solverConfig + ") is null," +
" call configure(...) first.");
}
return solverConfig.buildSolver();
}
}