forked from smooks/smooks
/
PreprocessTypeConverter.java
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/
PreprocessTypeConverter.java
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/*-
* ========================LICENSE_START=================================
* Core
* %%
* Copyright (C) 2020 Smooks
* %%
* Licensed under the terms of the Apache License Version 2.0, or
* the GNU Lesser General Public License version 3.0 or later.
*
* SPDX-License-Identifier: Apache-2.0 OR LGPL-3.0-or-later
*
* ======================================================================
*
* 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.
*
* ======================================================================
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 3 of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* =========================LICENSE_END==================================
*/
package org.smooks.engine.converter;
import org.smooks.api.SmooksConfigException;
import org.smooks.api.resource.config.Configurable;
import org.smooks.api.converter.TypeConverterFactory;
import org.smooks.api.ApplicationContext;
import org.smooks.api.converter.TypeConverter;
import org.smooks.api.converter.TypeConverterException;
import org.smooks.engine.expression.MVELExpressionEvaluator;
import org.smooks.engine.lookup.converter.NameTypeConverterFactoryLookup;
import org.smooks.support.ClassUtil;
import jakarta.annotation.PostConstruct;
import javax.inject.Inject;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
/**
* Data Preprocesses Decoder.
* <p/>
* Wraps the underlying decoder, allowing you to preprocess the data before
* passing to the base decoder.
*
* @author <a href="mailto:tom.fennelly@gmail.com">tom.fennelly@gmail.com</a>
*/
public class PreprocessTypeConverter implements Configurable, TypeConverter<String, Object> {
public static final String VALUE_PRE_PROCESSING = "valuePreprocess";
public static final String DELEGATE_TYPE_CONVERTER_FACTORY = "baseDecoder";
private MVELExpressionEvaluator expression;
@Inject
private ApplicationContext applicationContext;
private Properties properties;
private TypeConverter<? super String, ?> delegateTypeConverter;
@PostConstruct
public void postConstruct() {
expression = new MVELExpressionEvaluator(properties.getProperty(VALUE_PRE_PROCESSING));
expression.setToType(String.class);
final String delegateTypeConverterFactoryName = properties.getProperty(DELEGATE_TYPE_CONVERTER_FACTORY);
if (delegateTypeConverterFactoryName != null) {
TypeConverterFactory<String, Object> delegateTypeConverterFactory;
try {
final Class<TypeConverterFactory<?, ?>> typeConverterFactoryClass = ClassUtil.forName(delegateTypeConverterFactoryName, TypeConverterFactory.class);
try {
delegateTypeConverterFactory = (TypeConverterFactory<String, Object>) typeConverterFactoryClass.newInstance();
} catch (InstantiationException | IllegalAccessException e) {
throw new TypeConverterException("Failed to load TypeConverterFactory class '" + typeConverterFactoryClass.getName() + "'.", e);
}
} catch (ClassNotFoundException e) {
delegateTypeConverterFactory = (TypeConverterFactory<String, Object>) applicationContext.getRegistry().lookup(new NameTypeConverterFactoryLookup(delegateTypeConverterFactoryName));
}
delegateTypeConverter = delegateTypeConverterFactory.createTypeConverter();
if (delegateTypeConverter instanceof Configurable) {
((Configurable) delegateTypeConverter).setConfiguration(properties);
}
}
}
public TypeConverter<? super String, ?> getDelegateTypeConverter() {
return delegateTypeConverter;
}
public void setDelegateTypeConverter(final TypeConverter<? super String, ?> delegateTypeConverter) {
this.delegateTypeConverter = delegateTypeConverter;
}
@Override
public void setConfiguration(Properties properties) throws SmooksConfigException {
this.properties = properties;
}
@Override
public Properties getConfiguration() {
return properties;
}
@Override
public Object convert(String value) {
if (value != null) {
Map<String, String> contextObj = new HashMap<>();
// Make it available under the strings "data" or "value"...
contextObj.put("data", value);
contextObj.put("value", value);
return delegateTypeConverter.convert((String) expression.exec(contextObj));
} else {
return null;
}
}
}