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/*
* Copyright (c) 1998, 2020 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Oracle - initial API and implementation from Oracle TopLink
package org.eclipse.persistence.internal.indirection;
import java.beans.PropertyChangeListener;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.eclipse.persistence.descriptors.changetracking.ChangeTracker;
import org.eclipse.persistence.exceptions.DescriptorException;
import org.eclipse.persistence.indirection.ValueHolderInterface;
import org.eclipse.persistence.indirection.WeavedAttributeValueHolderInterface;
import org.eclipse.persistence.internal.helper.Helper;
import org.eclipse.persistence.internal.security.PrivilegedAccessHelper;
import org.eclipse.persistence.mappings.ForeignReferenceMapping;
/**
* A WeavedObjectBasicIndirectionPolicy is used by OneToOne mappings that are LAZY through weaving
* and which use Property(method) access.
*
* It extends BasicIndirection by providing the capability of calling the set method that was initially
* mapped in addition to the set method for the weaved valueholder in order to coordinate the value of the
* underlying property with the value stored in the valueholder
*
* @author Tom Ware
*/
public class WeavedObjectBasicIndirectionPolicy extends BasicIndirectionPolicy {
/** Name of the initial set method. */
protected String setMethodName = null;
/** Lazily initialized set method based on the set method name. */
protected transient Method setMethod = null;
/** Name of the initial get method. */
protected String getMethodName;
/** indicates whether the mapping has originally used method access */
protected boolean hasUsedMethodAccess;
/** Stores the actual type of the mapping if different from the reference type. Used for set method invocation*/
protected String actualTypeClassName = null;
public WeavedObjectBasicIndirectionPolicy(String getMethodName, String setMethodName, String actualTypeClassName, boolean hasUsedMethodAccess) {
super();
this.setMethodName = setMethodName;
this.getMethodName = getMethodName;
this.hasUsedMethodAccess = hasUsedMethodAccess;
this.actualTypeClassName = actualTypeClassName;
}
public String getActualTypeClassName() {
return actualTypeClassName;
}
/**
* Return the "real" attribute value, as opposed to any wrapper.
* This will trigger the wrapper to instantiate the value. In a weaved policy, this will
* also call the initial setter method to coordinate the values of the valueholder with
* the underlying data.
*/
@Override
public Object getRealAttributeValueFromObject(Object object, Object attribute) {
boolean wasInstantiated = attribute != null && attribute instanceof ValueHolderInterface && ((ValueHolderInterface)attribute).isInstantiated();
Object value = super.getRealAttributeValueFromObject(object, attribute);
// Provide the indirection policy with a callback that allows it to do any updates it needs as the result of getting the value.
if (!wasInstantiated && (value != attribute)) {
//if the attribute was already unwrapped then do not call this method
updateValueInObject(object, value, attribute);
}
return value;
}
/**
* This method will lazily initialize the set method
* Lazy initialization occurs to that we are not required to have a handle on
* the actual class that we are using until runtime. This helps to satisfy the
* weaving requirement that demands that we avoid loading domain classes into
* the main class loader until after weaving occurs.
*/
protected Method getSetMethod() {
if (setMethod == null) {
ForeignReferenceMapping sourceMapping = (ForeignReferenceMapping)mapping;
// The parameter type for the set method must always be the return type of the get method.
Class[] parameterTypes = new Class[1];
parameterTypes[0] = sourceMapping.getReferenceClass();
try {
setMethod = Helper.getDeclaredMethod(sourceMapping.getDescriptor().getJavaClass(), setMethodName, parameterTypes);
} catch (NoSuchMethodException e) {
if (actualTypeClassName != null) {
try {
// try the actual class of the field or property
parameterTypes[0] = Helper.getClassFromClasseName(actualTypeClassName, sourceMapping.getReferenceClass().getClassLoader());
setMethod = Helper.getDeclaredMethod(sourceMapping.getDescriptor().getJavaClass(), setMethodName, parameterTypes);
} catch (NoSuchMethodException nsme) {}
if (setMethod != null) {
return setMethod;
}
}
try {
// Get the set method type from the get method.
Method getMethod = Helper.getDeclaredMethod(sourceMapping.getDescriptor().getJavaClass(), getGetMethodName(), new Class[0]);
parameterTypes[0] = getMethod.getReturnType();
setMethod = Helper.getDeclaredMethod(sourceMapping.getDescriptor().getJavaClass(), setMethodName, parameterTypes);
} catch (NoSuchMethodException e2) {
// As a last ditch effort, change the parameter type to Object.class.
// If the model uses generics:
// public T getStuntDouble()
// public void setStuntDouble(T)
// The weaved methods will be:
// public Object getStuntDouble() and
// public void setStuntDouble(Object)
try {
parameterTypes[0] = Object.class;
setMethod = Helper.getDeclaredMethod(sourceMapping.getDescriptor().getJavaClass(), setMethodName, parameterTypes);
} catch (NoSuchMethodException e3) {
// Throw the original exception.
throw DescriptorException.errorAccessingSetMethodOfEntity(sourceMapping.getDescriptor().getJavaClass(), setMethodName, sourceMapping.getDescriptor(), e);
}
}
}
}
return setMethod;
}
/**
* Coordinate the valueholder for this mapping with the underlying property by calling the
* initial setter method.
*/
public void updateValueInObject(Object object, Object value, Object attributeValue){
setRealAttributeValueInObject(object, value);
((WeavedAttributeValueHolderInterface)attributeValue).setIsCoordinatedWithProperty(true);
}
/**
* Set the value of the appropriate attribute of target to attributeValue.
* In this case, place the value inside the target's ValueHolder.
* Change tracking will be turned off when this method is called
*/
@Override
public void setRealAttributeValueInObject(Object target, Object attributeValue) {
setRealAttributeValueInObject(target, attributeValue, false);
}
/**
* Set the value of the appropriate attribute of target to attributeValue.
* In this case, place the value inside the target's ValueHolder.
* if trackChanges is true, set the value in the object as if the user was setting it. Allow change tracking to pick up the change.
*/
@Override
public void setRealAttributeValueInObject(Object target, Object attributeValue, boolean trackChanges) {
// If the target object is using change tracking, it must be disable first to avoid thinking the value changed.
PropertyChangeListener listener = null;
ChangeTracker trackedObject = null;
if (!trackChanges && target instanceof ChangeTracker) {
trackedObject = (ChangeTracker)target;
listener = trackedObject._persistence_getPropertyChangeListener();
trackedObject._persistence_setPropertyChangeListener(null);
}
Object[] parameters = new Object[1];
parameters[0] = attributeValue;
try {
PrivilegedAccessHelper.callDoPrivilegedWithException(
() -> PrivilegedAccessHelper.invokeMethod(getSetMethod(), target, parameters),
(ex) -> {
if (ex instanceof IllegalAccessException) {
return DescriptorException.illegalAccessWhileSettingValueThruMethodAccessor(setMethod.getName(), attributeValue, ex);
} else if (ex instanceof IllegalArgumentException) {
return DescriptorException.illegalArgumentWhileSettingValueThruMethodAccessor(setMethod.getName(), attributeValue, ex);
} else if (ex instanceof InvocationTargetException) {
return DescriptorException.targetInvocationWhileSettingValueThruMethodAccessor(setMethod.getName(), attributeValue, ex);
}
// This indicates unexpected problem in the code
return new RuntimeException(String.format(
"Invocation of %s setter method failed", setMethod.getName()), ex);
}
);
} finally {
if (!trackChanges && trackedObject != null) {
trackedObject._persistence_setPropertyChangeListener(listener);
}
}
}
public String getGetMethodName() {
return this.getMethodName;
}
public String getSetMethodName() {
return this.setMethodName;
}
public boolean hasUsedMethodAccess() {
return this.hasUsedMethodAccess;
}
@Override
public boolean isWeavedObjectBasicIndirectionPolicy() {
return true;
}
}