com.vaadin.v7.data.util.MethodProperty Maven / Gradle / Ivy
Show all versions of vaadin-compatibility-server Show documentation
/*
* Copyright (C) 2000-2024 Vaadin Ltd
*
* This program is available under Vaadin Commercial License and Service Terms.
*
* See for the full
* license.
*/
package com.vaadin.v7.data.util;
import static com.vaadin.util.ReflectTools.convertPrimitiveType;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.logging.Level;
import java.util.logging.Logger;
import com.vaadin.data.Binder;
import com.vaadin.data.ValueProvider;
import com.vaadin.server.Setter;
import com.vaadin.shared.util.SharedUtil;
import com.vaadin.v7.data.Property;
import com.vaadin.v7.util.SerializerHelper;
/**
*
* Proxy class for creating Properties from pairs of getter and setter methods
* of a Bean property. An instance of this class can be thought as having been
* attached to a field of an object. Accessing the object through the Property
* interface directly manipulates the underlying field.
*
*
*
* It's assumed that the return value returned by the getter method is
* assignable to the type of the property, and the setter method parameter is
* assignable to that value.
*
*
*
* A valid getter method must always be available, but instance of this class
* can be constructed with a null setter method in which case the
* resulting MethodProperty is read-only.
*
*
*
* MethodProperty implements Property.ValueChangeNotifier, but does not
* automatically know whether or not the getter method will actually return a
* new value - value change listeners are always notified when setValue is
* called, without verifying what the getter returns.
*
*
* @author Vaadin Ltd.
* @since 3.0
*
* @deprecated As of 8.0, replaced by {@link ValueProvider}, {@link Setter}, see
* {@link Binder}
*/
@Deprecated
@SuppressWarnings("serial")
public class MethodProperty extends AbstractProperty {
/**
* The object that includes the property the MethodProperty is bound to.
*/
private transient Object instance;
/**
* Argument arrays for the getter and setter methods.
*/
private transient Object[] setArgs, getArgs;
/**
* The getter and setter methods.
*/
private transient Method setMethod, getMethod;
/**
* Index of the new value in the argument list for the setter method. If the
* setter method requires several parameters, this index tells which one is
* the actual value to change.
*/
private int setArgumentIndex;
/**
* Type of the property.
*/
private transient Class type;
private static final Object[] DEFAULT_GET_ARGS = new Object[0];
private static final Object[] DEFAULT_SET_ARGS = new Object[1];
/* Special serialization to handle method references */
private void writeObject(ObjectOutputStream out) throws IOException {
out.defaultWriteObject();
SerializerHelper.writeClass(out, type);
out.writeObject(instance);
out.writeObject(setArgs);
out.writeObject(getArgs);
if (setMethod != null) {
out.writeObject(setMethod.getName());
SerializerHelper.writeClassArray(out,
setMethod.getParameterTypes());
} else {
out.writeObject(null);
out.writeObject(null);
}
if (getMethod != null) {
out.writeObject(getMethod.getName());
SerializerHelper.writeClassArray(out,
getMethod.getParameterTypes());
} else {
out.writeObject(null);
out.writeObject(null);
}
}
/* Special serialization to handle method references */
private void readObject(ObjectInputStream in)
throws IOException, ClassNotFoundException {
in.defaultReadObject();
try {
@SuppressWarnings("unchecked")
// business assumption; type parameters not checked at runtime
Class class1 = (Class) SerializerHelper.readClass(in);
type = class1;
instance = in.readObject();
Object[] setArgs = (Object[]) in.readObject();
Object[] getArgs = (Object[]) in.readObject();
setArguments(getArgs, setArgs, setArgumentIndex);
String name = (String) in.readObject();
Class[] paramTypes = SerializerHelper.readClassArray(in);
if (instance != null && name != null) {
setMethod = instance.getClass().getMethod(name, paramTypes);
} else {
setMethod = null;
}
name = (String) in.readObject();
paramTypes = SerializerHelper.readClassArray(in);
if (instance != null && name != null) {
getMethod = instance.getClass().getMethod(name, paramTypes);
} else {
getMethod = null;
}
} catch (SecurityException e) {
getLogger().log(Level.SEVERE, "Internal deserialization error", e);
} catch (NoSuchMethodException e) {
getLogger().log(Level.SEVERE, "Internal deserialization error", e);
}
}
/**
*
* Creates a new instance of MethodProperty from a named bean
* property. This constructor takes an object and the name of a bean
* property and initializes itself with the accessor methods for the
* property.
*
*
* The getter method of a MethodProperty instantiated with this
* constructor will be called with no arguments, and the setter method with
* only the new value as the sole argument.
*
*
*
* If the setter method is unavailable, the resulting
* MethodProperty will be read-only, otherwise it will be
* read-write.
*
*
*
* Method names are constructed from the bean property by adding
* get/is/are/set prefix and capitalising the first character in the name of
* the given bean property.
*
*
* @param instance
* the object that includes the property.
* @param beanPropertyName
* the name of the property to bind to.
*/
@SuppressWarnings("unchecked")
public MethodProperty(Object instance, String beanPropertyName) {
final Class beanClass = instance.getClass();
// Assure that the first letter is upper cased (it is a common
// mistake to write firstName, not FirstName).
beanPropertyName = SharedUtil.capitalize(beanPropertyName);
// Find the get method
getMethod = null;
try {
getMethod = initGetterMethod(beanPropertyName, beanClass);
} catch (final NoSuchMethodException ignored) {
throw new MethodException(this,
"Bean property " + beanPropertyName + " can not be found");
}
// In case the get method is found, resolve the type
Class returnType = getMethod.getReturnType();
// Finds the set method
setMethod = null;
try {
setMethod = beanClass.getMethod("set" + beanPropertyName,
new Class[] { returnType });
} catch (final NoSuchMethodException skipped) {
}
// Gets the return type from get method
if (returnType.isPrimitive()) {
type = (Class) convertPrimitiveType(returnType);
if (type.isPrimitive()) {
throw new MethodException(this,
"Bean property " + beanPropertyName
+ " getter return type must not be void");
}
} else {
type = (Class) returnType;
}
setArguments(DEFAULT_GET_ARGS, DEFAULT_SET_ARGS, 0);
this.instance = instance;
}
/**
*
* Creates a new instance of MethodProperty from named getter
* and setter methods. The getter method of a MethodProperty
* instantiated with this constructor will be called with no arguments, and
* the setter method with only the new value as the sole argument.
*
*
*
* If the setter method is null, the resulting
* MethodProperty will be read-only, otherwise it will be
* read-write.
*
*
* @param type
* the type of the property.
* @param instance
* the object that includes the property.
* @param getMethodName
* the name of the getter method.
* @param setMethodName
* the name of the setter method.
*
*/
public MethodProperty(Class type, Object instance,
String getMethodName, String setMethodName) {
this(type, instance, getMethodName, setMethodName, new Object[] {},
new Object[] { null }, 0);
}
/**
*
* Creates a new instance of MethodProperty with the getter and
* setter methods. The getter method of a MethodProperty
* instantiated with this constructor will be called with no arguments, and
* the setter method with only the new value as the sole argument.
*
*
*
* If the setter method is null, the resulting
* MethodProperty will be read-only, otherwise it will be
* read-write.
*
*
* @param type
* the type of the property.
* @param instance
* the object that includes the property.
* @param getMethod
* the getter method.
* @param setMethod
* the setter method.
*/
public MethodProperty(Class type, Object instance,
Method getMethod, Method setMethod) {
this(type, instance, getMethod, setMethod, new Object[] {},
new Object[] { null }, 0);
}
/**
*
* Creates a new instance of MethodProperty from named getter
* and setter methods and argument lists. The getter method of a
* MethodProperty instantiated with this constructor will be
* called with the getArgs as arguments. The setArgs will be used as the
* arguments for the setter method, though the argument indexed by the
* setArgumentIndex will be replaced with the argument passed to the
* {@link #setValue(Object newValue)} method.
*
*
*
* For example, if the setArgs contains A,
* B and C, and setArgumentIndex =
* 1, the call methodProperty.setValue(X) would result
* in the setter method to be called with the parameter set of
* {A, X, C}
*
*
* @param type
* the type of the property.
* @param instance
* the object that includes the property.
* @param getMethodName
* the name of the getter method.
* @param setMethodName
* the name of the setter method.
* @param getArgs
* the fixed argument list to be passed to the getter method.
* @param setArgs
* the fixed argument list to be passed to the setter method.
* @param setArgumentIndex
* the index of the argument in setArgs to be
* replaced with newValue when
* {@link #setValue(Object newValue)} is called.
*/
@SuppressWarnings("unchecked")
public MethodProperty(Class type, Object instance,
String getMethodName, String setMethodName, Object[] getArgs,
Object[] setArgs, int setArgumentIndex) {
// Check the setargs and setargs index
if (setMethodName != null && setArgs == null) {
throw new IndexOutOfBoundsException("The setArgs can not be null");
}
if (setMethodName != null && (setArgumentIndex < 0
|| setArgumentIndex >= setArgs.length)) {
throw new IndexOutOfBoundsException(
"The setArgumentIndex must be >= 0 and < setArgs.length");
}
// Set type
this.type = type;
// Find set and get -methods
final Method[] methods = instance.getClass().getMethods();
// Finds get method
boolean found = false;
for (Method m : methods) {
// Tests the name of the get Method
if (!m.getName().equals(getMethodName)) {
// name does not match, try next method
continue;
}
// Tests return type
if (!type.equals(m.getReturnType())) {
continue;
}
// Tests the parameter types
final Class[] c = m.getParameterTypes();
if (c.length != getArgs.length) {
// not the right amount of parameters, try next method
continue;
}
int j = 0;
while (j < c.length) {
if (getArgs[j] != null
&& !c[j].isAssignableFrom(getArgs[j].getClass())) {
// parameter type does not match, try next method
break;
}
j++;
}
if (j == c.length) {
// all parameters matched
if (found) {
throw new MethodException(this,
"Could not uniquely identify " + getMethodName
+ "-method");
} else {
found = true;
getMethod = m;
}
}
}
if (!found) {
throw new MethodException(this,
"Could not find " + getMethodName + "-method");
}
// Finds set method
if (setMethodName != null) {
// Finds setMethod
found = false;
for (Method m : methods) {
// Checks name
if (!m.getName().equals(setMethodName)) {
// name does not match, try next method
continue;
}
// Checks parameter compatibility
final Class[] c = m.getParameterTypes();
if (c.length != setArgs.length) {
// not the right amount of parameters, try next method
continue;
}
int j = 0;
while (j < c.length) {
if (setArgs[j] != null
&& !c[j].isAssignableFrom(setArgs[j].getClass())) {
// parameter type does not match, try next method
break;
} else if (j == setArgumentIndex && !c[j].equals(type)) {
// Property type is not the same as setArg type
break;
}
j++;
}
if (j == c.length) {
// all parameters match
if (found) {
throw new MethodException(this,
"Could not identify unique " + setMethodName
+ "-method");
} else {
found = true;
setMethod = m;
}
}
}
if (!found) {
throw new MethodException(this,
"Could not identify " + setMethodName + "-method");
}
}
// Gets the return type from get method
this.type = (Class) convertPrimitiveType(type);
setArguments(getArgs, setArgs, setArgumentIndex);
this.instance = instance;
}
/**
*
* Creates a new instance of MethodProperty from the getter and
* setter methods, and argument lists.
*
*
* This constructor behaves exactly like
* {@link #MethodProperty(Class type, Object instance, String getMethodName, String setMethodName, Object [] getArgs, Object [] setArgs, int setArgumentIndex)}
* except that instead of names of the getter and setter methods this
* constructor is given the actual methods themselves.
*
*
* @param type
* the type of the property.
* @param instance
* the object that includes the property.
* @param getMethod
* the getter method.
* @param setMethod
* the setter method.
* @param getArgs
* the fixed argument list to be passed to the getter method.
* @param setArgs
* the fixed argument list to be passed to the setter method.
* @param setArgumentIndex
* the index of the argument in setArgs to be
* replaced with newValue when
* {@link #setValue(Object newValue)} is called.
*/
@SuppressWarnings("unchecked")
// cannot use "Class" because of automatic primitive type
// conversions
public MethodProperty(Class type, Object instance, Method getMethod,
Method setMethod, Object[] getArgs, Object[] setArgs,
int setArgumentIndex) {
if (getMethod == null) {
throw new MethodException(this,
"Property GET-method cannot not be null: " + type);
}
if (setMethod != null) {
if (setArgs == null) {
throw new IndexOutOfBoundsException(
"The setArgs can not be null");
}
if (setArgumentIndex < 0 || setArgumentIndex >= setArgs.length) {
throw new IndexOutOfBoundsException(
"The setArgumentIndex must be >= 0 and < setArgs.length");
}
}
// Gets the return type from get method
Class convertedType = (Class) convertPrimitiveType(
type);
this.getMethod = getMethod;
this.setMethod = setMethod;
setArguments(getArgs, setArgs, setArgumentIndex);
this.instance = instance;
this.type = convertedType;
}
/**
* Find a getter method for a property (getXyz(), isXyz() or areXyz()).
*
* @param propertyName
* name of the property
* @param beanClass
* class in which to look for the getter methods
* @return Method
* @throws NoSuchMethodException
* if no getter found
*/
static Method initGetterMethod(String propertyName,
final Class beanClass) throws NoSuchMethodException {
propertyName = SharedUtil.capitalize(propertyName);
Method getMethod = null;
try {
getMethod = beanClass.getMethod("get" + propertyName,
new Class[] {});
} catch (final NoSuchMethodException ignored) {
try {
getMethod = beanClass.getMethod("is" + propertyName,
new Class[] {});
} catch (final NoSuchMethodException ignoredAsWell) {
getMethod = beanClass.getMethod("are" + propertyName,
new Class[] {});
}
}
return getMethod;
}
/**
* Returns the type of the Property. The methods getValue and
* setValue must be compatible with this type: one must be able
* to safely cast the value returned from getValue to the given
* type and pass any variable assignable to this type as an argument to
* setValue.
*
* @return type of the Property
*/
@Override
public final Class getType() {
return type;
}
/**
* Tests if the object is in read-only mode. In read-only mode calls to
* setValue will throw ReadOnlyException and will
* not modify the value of the Property.
*
* @return true if the object is in read-only mode,
* false if it's not
*/
@Override
public boolean isReadOnly() {
return super.isReadOnly() || (setMethod == null);
}
/**
* Gets the value stored in the Property. The value is resolved by calling
* the specified getter method with the argument specified at instantiation.
*
* @return the value of the Property
*/
@Override
public T getValue() {
try {
if (instance == null) {
return null;
} else {
return (T) getMethod.invoke(instance, getArgs);
}
} catch (final Throwable e) {
throw new MethodException(this, e);
}
}
/**
*
* Sets the setter method and getter method argument lists.
*
*
* @param getArgs
* the fixed argument list to be passed to the getter method.
* @param setArgs
* the fixed argument list to be passed to the setter method.
* @param setArgumentIndex
* the index of the argument in setArgs to be
* replaced with newValue when
* {@link #setValue(Object newValue)} is called.
*/
public void setArguments(Object[] getArgs, Object[] setArgs,
int setArgumentIndex) {
if (getArgs.length == 0) {
this.getArgs = DEFAULT_GET_ARGS;
} else {
this.getArgs = Arrays.copyOf(getArgs, getArgs.length);
}
if (Arrays.equals(setArgs, DEFAULT_SET_ARGS)) {
this.setArgs = DEFAULT_SET_ARGS;
} else {
this.setArgs = Arrays.copyOf(setArgs, setArgs.length);
}
this.setArgumentIndex = setArgumentIndex;
}
/**
* Sets the value of the property.
*
* Note that since Vaadin 7, no conversions are performed and the value must
* be of the correct type.
*
* @param newValue
* the New value of the property.
* @throws ReadOnlyException if the property has been set to read only
* @see #invokeSetMethod(Object)
*/
@Override
public void setValue(T newValue) throws Property.ReadOnlyException {
// Checks the mode
if (isReadOnly()) {
throw new Property.ReadOnlyException();
}
invokeSetMethod(newValue);
fireValueChange();
}
/**
* Internal method to actually call the setter method of the wrapped
* property.
*
* @param value
*/
protected void invokeSetMethod(T value) {
try {
// Construct a temporary argument array only if needed
if (setArgs.length == 1) {
setMethod.invoke(instance, new Object[] { value });
} else {
// Sets the value to argument array
final Object[] args = new Object[setArgs.length];
for (int i = 0; i < setArgs.length; i++) {
args[i] = (i == setArgumentIndex) ? value : setArgs[i];
}
setMethod.invoke(instance, args);
}
} catch (final InvocationTargetException e) {
final Throwable targetException = e.getTargetException();
throw new MethodException(this, targetException);
} catch (final Exception e) {
throw new MethodException(this, e);
}
}
/**
* Exception object that signals that there were problems
* calling or finding the specified getter or setter methods of the
* property.
*
* @author Vaadin Ltd.
* @since 3.0
*/
@SuppressWarnings("rawtypes")
@Deprecated
// Exceptions cannot be parameterized, ever.
public static class MethodException extends RuntimeException {
/**
* The method property from which the exception originates from
*/
private final Property property;
/**
* Cause of the method exception
*/
private Throwable cause;
/**
* Constructs a new MethodException with the specified
* detail message.
*
* @param property
* the property.
* @param msg
* the detail message.
*/
public MethodException(Property property, String msg) {
super(msg);
this.property = property;
}
/**
* Constructs a new MethodException from another exception.
*
* @param property
* the property.
* @param cause
* the cause of the exception.
*/
public MethodException(Property property, Throwable cause) {
this.property = property;
this.cause = cause;
}
/**
* @see java.lang.Throwable#getCause()
*/
@Override
public Throwable getCause() {
return cause;
}
/**
* Gets the method property this exception originates from.
*
* @return MethodProperty or null if not a valid MethodProperty
*/
public MethodProperty getMethodProperty() {
return (property instanceof MethodProperty)
? (MethodProperty) property
: null;
}
/**
* Gets the method property this exception originates from.
*
* @return Property from which the exception originates
*/
public Property getProperty() {
return property;
}
}
/**
* Sends a value change event to all registered listeners.
*
* Public for backwards compatibility, visibility may be reduced in future
* versions.
*/
@Override
public void fireValueChange() {
super.fireValueChange();
}
/**
* The instance used by this property.
*
* @return the instance used for fetching the property value
* @since 7.7.7
*/
public Object getInstance() {
return instance;
}
/**
* Sets the instance used by this property.
*
* The new instance must be of the same type as the old instance
*
* To be consistent with {@link #setValue(Object)}, this method will fire a
* value change event even if the value stays the same
*
* @param instance
* the instance to use
* @since 7.7.7
*/
public void setInstance(Object instance) {
if (this.instance.getClass() != instance.getClass()) {
throw new IllegalArgumentException("The new instance is of type "
+ instance.getClass().getName()
+ " which does not match the old instance type "
+ this.instance.getClass().getName());
}
this.instance = instance;
fireValueChange();
}
private static final Logger getLogger() {
return Logger.getLogger(MethodProperty.class.getName());
}
}