org.drools.core.xml.jaxb.util.JaxbListAdapter Maven / Gradle / Ivy
/*
* Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* 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.core.xml.jaxb.util;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import javax.xml.bind.annotation.adapters.XmlAdapter;
import org.drools.core.xml.jaxb.util.JaxbListWrapper.JaxbWrapperType;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class JaxbListAdapter extends XmlAdapter {
protected static Logger logger = LoggerFactory.getLogger(JaxbListAdapter.class);
private final static JaxbUnknownAdapter unknownAdapter = new JaxbUnknownAdapter();
@Override
public JaxbListWrapper marshal( Collection v ) throws Exception {
try {
if( v == null ) {
return new JaxbListWrapper(new Object[0]);
} else if( v instanceof List ) {
Object [] marshalledArr = marshalUnknownCollection(v);
return new JaxbListWrapper(marshalledArr, JaxbWrapperType.LIST);
} else if( v instanceof Set ) {
Object [] marshalledArr = marshalUnknownCollection(v);
return new JaxbListWrapper(marshalledArr, JaxbWrapperType.SET);
} else {
throw new UnsupportedOperationException("Unsupported collection type: " + v.getClass());
}
} catch( Exception e ) {
// because exceptions are always swallowed by JAXB
logger.error("Unable to marshal " + v.getClass().getName() + " instance: " + e.getMessage(), e);
throw e;
}
}
private static Object [] marshalUnknownCollection(Collection objColl) throws Exception {
Object [] wrapperArr = new Object[objColl.size()];
int i = 0;
for( Object obj : objColl ) {
wrapperArr[i++] = unknownAdapter.marshal(obj);
}
return wrapperArr;
}
@Override
public Collection unmarshal( JaxbListWrapper v ) throws Exception {
try {
if( v.getType() == null ) {
// the Arrays.asList() impl is non-modifiable
return new ArrayList(Arrays.asList(v.getElements()));
} else {
switch ( v.getType() ) {
case LIST:
return new ArrayList(unmarshalWrappedArray(v.getElements()));
case SET:
return new HashSet(unmarshalWrappedArray(v.getElements()));
default:
throw new UnsupportedOperationException("Unsupported collection type: " + v.getType());
}
}
} catch( Exception e ) {
// because exceptions are always swallowed by JAXB
logger.error("Unable to *un*marshal " + v.getClass().getName() + " instance: " + e.getMessage(), e);
throw e;
}
}
private static Collection unmarshalWrappedArray(Object [] objArr) throws Exception {
if( objArr == null ) {
return Collections.EMPTY_LIST;
}
List