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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 com.opensymphony.xwork2.conversion.impl;
import com.opensymphony.xwork2.conversion.ObjectTypeDeterminer;
import com.opensymphony.xwork2.conversion.TypeConverter;
import com.opensymphony.xwork2.inject.Inject;
import java.lang.reflect.Member;
import java.util.Collection;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.SortedSet;
import java.util.TreeSet;
public class CollectionConverter extends DefaultTypeConverter {
private ObjectTypeDeterminer objectTypeDeterminer;
@Inject
public void setObjectTypeDeterminer(ObjectTypeDeterminer determiner) {
this.objectTypeDeterminer = determiner;
}
public Object convertValue(Map context, Object target, Member member, String propertyName, Object value, Class toType) {
Collection result;
Class memberType = String.class;
if (target != null) {
memberType = objectTypeDeterminer.getElementClass(target.getClass(), propertyName, null);
if (memberType == null) {
memberType = String.class;
}
}
if (toType.isAssignableFrom(value.getClass())) {
// no need to do anything
result = (Collection) value;
} else if (value.getClass().isArray()) {
Object[] objArray = (Object[]) value;
TypeConverter converter = getTypeConverter(context);
result = createCollection(toType, memberType, objArray.length);
for (Object anObjArray : objArray) {
Object convertedValue = converter.convertValue(context, target, member, propertyName, anObjArray, memberType);
if (!TypeConverter.NO_CONVERSION_POSSIBLE.equals(convertedValue)) {
result.add(convertedValue);
}
}
} else if (Collection.class.isAssignableFrom(value.getClass())) {
Collection col = (Collection) value;
TypeConverter converter = getTypeConverter(context);
result = createCollection(toType, memberType, col.size());
for (Object aCol : col) {
Object convertedValue = converter.convertValue(context, target, member, propertyName, aCol, memberType);
if (!TypeConverter.NO_CONVERSION_POSSIBLE.equals(convertedValue)) {
result.add(convertedValue);
}
}
} else {
result = createCollection(toType, memberType, -1);
TypeConverter converter = getTypeConverter(context);
Object convertedValue = converter.convertValue(context, target, member, propertyName, value, memberType);
if (!TypeConverter.NO_CONVERSION_POSSIBLE.equals(convertedValue)) {
result.add(convertedValue);
}
}
return result;
}
private Collection createCollection(Class toType, Class memberType, int size) {
Collection result;
if (toType == Set.class) {
if (size > 0) {
result = new HashSet(size);
} else {
result = new HashSet();
}
} else if (toType == SortedSet.class) {
result = new TreeSet();
} else {
if (size > 0) {
result = new XWorkList(memberType, size);
} else {
result = new XWorkList(memberType);
}
}
return result;
}
}