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'databene commons' is an open source Java library by Volker Bergmann.
It provides extensions to the Java core library by utility classes, abstract concepts
and concrete implementations.
/*
* Copyright (C) 2004-2014 Volker Bergmann ([email protected]).
* All rights reserved.
*
* 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.databene.commons.mutator;
import java.beans.PropertyDescriptor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.util.Map;
import org.databene.commons.Assert;
import org.databene.commons.BeanUtil;
import org.databene.commons.Composite;
import org.databene.commons.ConfigurationError;
import org.databene.commons.Context;
import org.databene.commons.ConversionException;
import org.databene.commons.Escalator;
import org.databene.commons.LoggerEscalator;
import org.databene.commons.UpdateFailedException;
import org.databene.commons.accessor.FeatureAccessor;
import org.databene.commons.converter.AnyConverter;
/**
* Mutator implementation for graphs of any object types.
* Created: 31.01.2008 20:15:11
* @since 0.3.0
* @author Volker Bergmann
*/
public class AnyMutator implements NamedMutator {
private static Escalator escalator = new LoggerEscalator();
private String path;
private boolean required;
private boolean autoConvert;
public AnyMutator(String path) {
this(path, true, false);
}
public AnyMutator(String path, boolean required, boolean autoConvert) {
this.path = Assert.notNull(path, "path");
this.required = required;
this.autoConvert = autoConvert;
}
@Override
public String getName() {
return path;
}
@Override
public void setValue(Object target, Object value) throws UpdateFailedException {
setValue(target, path, value, required, autoConvert);
}
public static void setValue(C target, String path, V value) {
setValue(target, path, value, true, false);
}
public static void setValue(C target, String path, V value, boolean required, boolean autoConvert) {
int sep = path.indexOf('.');
if (sep < 0)
// it is a local property
setLocal(target, path, value, required, autoConvert);
else {
// a recursive feature path needs to be resolved
String localName = path.substring(0, sep);
Object subTarget = FeatureAccessor.getValue(target, localName, true);
if (subTarget == null) {
// feature exists but is null, so create an object and assign it to the feature
subTarget = setFeatureDefault(target, localName);
}
String remainingName = path.substring(sep + 1);
setValue(subTarget, remainingName, value, required, autoConvert);
}
}
public static Object setFeatureDefault(Object target, String featureName) {
// try JavaBean property
PropertyDescriptor propertyDescriptor = BeanUtil.getPropertyDescriptor(target.getClass(), featureName);
if (propertyDescriptor != null) {
try {
Object value = BeanUtil.newInstance(propertyDescriptor.getPropertyType());
Method writeMethod = propertyDescriptor.getWriteMethod();
writeMethod.invoke(target, value);
return value;
} catch (Exception e) {
throw new ConfigurationError("Unable to write feature '" + featureName + "'", e);
}
} else {
// try attribute
Class type = ((target instanceof Class) ? (Class) target : target.getClass());
Field field = BeanUtil.getField(type, featureName);
if (field != null) {
Object value = BeanUtil.newInstance(field.getType());
BeanUtil.setAttributeValue(target, field, value);
return value;
} else {
throw new ConfigurationError("Feature '" + featureName + "' not found in class " + type.getName());
}
}
}
@SuppressWarnings({ "unchecked", "rawtypes" })
private static void setLocal(C target, String featureName, V value, boolean required, boolean autoConvert) {
if (BeanUtil.hasWriteableProperty(target.getClass(), featureName))
BeanUtil.setPropertyValue(target, featureName, value, required, autoConvert);
else if (target instanceof Context)
((Context) target).set(featureName, value);
else if (target instanceof Map)
((Map) target).put(featureName, value);
else if (target instanceof Composite)
((Composite) target).setComponent(featureName, value);
else {
// try generic set(String, Object) method
Method genericSetMethod = BeanUtil.findMethod(target.getClass(), "set", String.class, Object.class);
if (genericSetMethod != null) {
BeanUtil.invoke(target, genericSetMethod, true, new Object[] { featureName, value });
return;
}
// try JavaBean property
try {
Field field = target.getClass().getField(featureName);
if (autoConvert && value != null) {
Class sourceType = value.getClass();
Class targetType = field.getType();
try {
if (!targetType.isAssignableFrom(sourceType))
value = (V) AnyConverter.convert(value, targetType);
} catch (ConversionException e) {
throw new ConfigurationError(e);
}
}
field.set(target, value);
} catch (NoSuchFieldException e) {
String message = "No feature '" + featureName + "' found in " + target;
if (required)
throw new UnsupportedOperationException(message);
else
escalator.escalate(message, AnyMutator.class, null);
} catch (IllegalAccessException e) {
throw new UnsupportedOperationException("Error accessing attribute '" +
featureName + "' of class " + target.getClass().getName(), e);
}
}
}
}