com.github.dozermapper.core.propertydescriptor.JavaBeanPropertyDescriptor Maven / Gradle / Ivy
/*
* Copyright 2005-2019 Dozer Project
*
* 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 com.github.dozermapper.core.propertydescriptor;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Method;
import com.github.dozermapper.core.config.BeanContainer;
import com.github.dozermapper.core.factory.DestBeanCreator;
import com.github.dozermapper.core.fieldmap.HintContainer;
import com.github.dozermapper.core.util.MappingUtils;
import com.github.dozermapper.core.util.ReflectionUtils;
import org.apache.commons.beanutils.PropertyUtils;
/**
* Internal class used to read and write values for fields that follow the java bean spec and have corresponding
* getter/setter methods for the field that are name accordingly. If the field does not have the necessary
* getter/setter, an exception will be thrown. Only intended for internal use.
*/
public class JavaBeanPropertyDescriptor extends GetterSetterPropertyDescriptor {
private PropertyDescriptor pd;
private boolean propertyDescriptorsRefreshed;
public JavaBeanPropertyDescriptor(Class clazz, String fieldName, boolean isIndexed, int index,
HintContainer srcDeepIndexHintContainer, HintContainer destDeepIndexHintContainer,
BeanContainer beanContainer, DestBeanCreator destBeanCreator) {
super(clazz, fieldName, isIndexed, index, srcDeepIndexHintContainer, destDeepIndexHintContainer, beanContainer, destBeanCreator);
}
@Override
public Method getWriteMethod() throws NoSuchMethodException {
Method result = getPropertyDescriptor(destDeepIndexHintContainer).getWriteMethod();
result = result == null ? ReflectionUtils.getNonStandardSetter(clazz, fieldName) : result;
if (result == null) {
result = retryMissingMethod(true);
}
propertyDescriptorsRefreshed = false;
return result;
}
@Override
protected String getSetMethodName() throws NoSuchMethodException {
return getWriteMethod().getName();
}
@Override
protected Method getReadMethod() throws NoSuchMethodException {
Method result = getPropertyDescriptor(srcDeepIndexHintContainer).getReadMethod();
if (result == null) {
result = retryMissingMethod(false);
}
propertyDescriptorsRefreshed = false;
return result;
}
@Override
protected boolean isCustomSetMethod() {
return false;
}
/**
* PropertyDescriptor may lose the references to the write and read methods during
* garbage collection. If the methods can't be found, we should retry once to
* ensure that our PropertyDescriptor hasn't gone bad and the method really
* isn't there.
*
* @param writeMethod {@code true} to look for the write method for a property,
* {@code false} to look for the read method
* @return the method or {@code null}
* @throws NoSuchMethodException if we've already retried finding the method once
* @see Dozer mapping stops working
*/
private Method retryMissingMethod(boolean writeMethod) throws NoSuchMethodException {
if (propertyDescriptorsRefreshed) {
throw new NoSuchMethodException(
"Unable to determine " + (writeMethod ? "write" : "read") +
" method for Field: '" + fieldName + "' in Class: " + clazz);
} else {
refreshPropertyDescriptors();
return writeMethod ? getWriteMethod() : getReadMethod();
}
}
/**
* Cleans out the {@link PropertyDescriptor} cache; when suspecting that
* our PropertyDescriptor has lost its references, we want it to be re-built
* (instead of getting the same instance from the cache).
*/
private void refreshPropertyDescriptors() {
PropertyUtils.clearDescriptors();
pd = null;
propertyDescriptorsRefreshed = true;
}
private PropertyDescriptor getPropertyDescriptor(HintContainer deepIndexHintContainer) {
if (pd == null) {
pd = ReflectionUtils.findPropertyDescriptor(clazz, fieldName, deepIndexHintContainer);
if (pd == null) {
MappingUtils.throwMappingException("Property: '" + fieldName + "' not found in Class: " + clazz);
}
}
return pd;
}
}