/*
* 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.bruteforce.BruteForceSolverConfig;
import org.drools.planner.config.localsearch.LocalSearchSolverConfig;
import org.drools.planner.core.Solver;
/**
* XML based configuration that builds a {@link Solver}.
*/
public class XmlSolverConfigurer {
private XStream xStream;
private AbstractSolverConfig config = null;
public XmlSolverConfigurer() {
// 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(BruteForceSolverConfig.class);
xStream.processAnnotations(LocalSearchSolverConfig.class);
}
public XmlSolverConfigurer(String resource) {
this();
configure(resource);
}
public void addXstreamAlias(Class aliasClass) {
xStream.processAnnotations(aliasClass);
}
public AbstractSolverConfig getConfig() {
return config;
}
// ************************************************************************
// Worker methods
// ************************************************************************
public XmlSolverConfigurer 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 XmlSolverConfigurer 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);
}
}
public XmlSolverConfigurer configure(Reader reader) {
config = (AbstractSolverConfig) xStream.fromXML(reader);
return this;
}
public Solver buildSolver() {
return config.buildSolver();
}
}