/**
* 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 org.apache.camel.impl.converter;
import java.beans.PropertyEditor;
import java.beans.PropertyEditorManager;
import java.util.HashMap;
import java.util.Map;
import org.apache.camel.Exchange;
import org.apache.camel.TypeConverter;
import org.apache.camel.util.LRUSoftCache;
import org.apache.camel.util.ObjectHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Uses the {@link java.beans.PropertyEditor} conversion system to convert Objects to
* and from String values.
*
* @deprecated should be removed as it can cause side-effects when using 3rd party property editors
*
* @version
*/
@Deprecated
public class PropertyEditorTypeConverter implements TypeConverter {
private static final Logger LOG = LoggerFactory.getLogger(PropertyEditorTypeConverter.class);
// use a soft bound cache to avoid using too much memory in case a lot of different classes
// is being converted to string
private final Map<Class<?>, Class<?>> misses = new LRUSoftCache<Class<?>, Class<?>>(1000);
// we don't anticipate so many property editors so we have unbounded map
private final Map<Class<?>, PropertyEditor> cache = new HashMap<Class<?>, PropertyEditor>();
public void clear() {
cache.clear();
misses.clear();
}
@Override
public boolean allowNull() {
return false;
}
@Override
public <T> T convertTo(Class<T> type, Object value) {
// We can't convert null values since we can't figure out a property
// editor for it.
if (value == null) {
return null;
}
if (value.getClass() == String.class) {
// No conversion needed.
if (type == String.class) {
return ObjectHelper.cast(type, value);
}
Class<?> key = type;
PropertyEditor editor = lookupEditor(key);
if (editor != null) {
// we are essentially not thread safe as we use 2 calls to convert
editor.setAsText(value.toString());
return ObjectHelper.cast(type, editor.getValue());
}
} else if (type == String.class) {
Class<?> key = value.getClass();
PropertyEditor editor = lookupEditor(key);
if (editor != null) {
// we are essentially not thread safe as we use 2 calls to convert
editor.setValue(value);
return ObjectHelper.cast(type, editor.getAsText());
}
}
return null;
}
private PropertyEditor lookupEditor(Class<?> type) {
// check misses first
if (misses.containsKey(type)) {
LOG.trace("No previously found property editor for type: {}", type);
return null;
}
synchronized (cache) {
// not a miss then try to lookup the editor
PropertyEditor editor = cache.get(type);
if (editor == null) {
// findEditor is synchronized and very slow so we want to only lookup once for a given key
// and then we use our own local cache for faster lookup
editor = PropertyEditorManager.findEditor(type);
// either we found an editor, or if not then register it as a miss
if (editor != null) {
LOG.trace("Found property editor for type: {} -> {}", type, editor);
cache.put(type, editor);
} else {
LOG.trace("Cannot find property editor for type: {}", type);
misses.put(type, type);
}
}
return editor;
}
}
@Override
public <T> T convertTo(Class<T> type, Exchange exchange, Object value) {
return convertTo(type, value);
}
@Override
public <T> T mandatoryConvertTo(Class<T> type, Object value) {
return convertTo(type, value);
}
@Override
public <T> T mandatoryConvertTo(Class<T> type, Exchange exchange, Object value) {
return convertTo(type, value);
}
@Override
public <T> T tryConvertTo(Class<T> type, Exchange exchange, Object value) {
try {
return convertTo(type, exchange, value);
} catch (Exception e) {
return null;
}
}
@Override
public <T> T tryConvertTo(Class<T> type, Object value) {
try {
return convertTo(type, null, value);
} catch (Exception e) {
return null;
}
}
}