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- /*
- * Copyright 2000-2016 Vaadin Ltd.
- *
- * 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.vaadin.data;
-
- import java.beans.IntrospectionException;
- import java.beans.PropertyDescriptor;
- import java.io.IOException;
- import java.io.Serializable;
- import java.lang.reflect.InvocationTargetException;
- import java.lang.reflect.Method;
- import java.util.Map;
- import java.util.Objects;
- import java.util.Optional;
- import java.util.concurrent.ConcurrentHashMap;
- import java.util.concurrent.ConcurrentMap;
- import java.util.function.Function;
- import java.util.stream.Collectors;
- import java.util.stream.Stream;
-
- import com.vaadin.data.util.BeanUtil;
- import com.vaadin.server.Setter;
- import com.vaadin.shared.util.SharedUtil;
- import com.vaadin.util.ReflectTools;
-
- /**
- * A {@link PropertySet} that uses reflection to find bean properties.
- *
- * @author Vaadin Ltd
- *
- * @since
- *
- * @param <T>
- * the type of the bean
- */
- public class BeanPropertySet<T> implements PropertySet<T> {
-
- /**
- * Serialized form of a property set. When deserialized, the property set
- * for the corresponding bean type is requested, which either returns the
- * existing cached instance or creates a new one.
- *
- * @see #readResolve()
- * @see BeanPropertyDefinition#writeReplace()
- */
- private static class SerializedPropertySet implements Serializable {
- private final Class<?> beanType;
-
- private SerializedPropertySet(Class<?> beanType) {
- this.beanType = beanType;
- }
-
- private Object readResolve() {
- /*
- * When this instance is deserialized, it will be replaced with a
- * property set for the corresponding bean type and property name.
- */
- return get(beanType);
- }
- }
-
- /**
- * Serialized form of a property definition. When deserialized, the property
- * set for the corresponding bean type is requested, which either returns
- * the existing cached instance or creates a new one. The right property
- * definition is then fetched from the property set.
- *
- * @see #readResolve()
- * @see BeanPropertySet#writeReplace()
- */
- private static class SerializedPropertyDefinition implements Serializable {
- private final Class<?> beanType;
- private final String propertyName;
-
- private SerializedPropertyDefinition(Class<?> beanType,
- String propertyName) {
- this.beanType = beanType;
- this.propertyName = propertyName;
- }
-
- private Object readResolve() throws IOException {
- /*
- * When this instance is deserialized, it will be replaced with a
- * property definition for the corresponding bean type and property
- * name.
- */
- return get(beanType).getProperty(propertyName)
- .orElseThrow(() -> new IOException(
- beanType + " no longer has a property named "
- + propertyName));
- }
- }
-
- private static class BeanPropertyDefinition<T, V>
- implements PropertyDefinition<T, V> {
-
- private final PropertyDescriptor descriptor;
- private final BeanPropertySet<T> propertySet;
-
- public BeanPropertyDefinition(BeanPropertySet<T> propertySet,
- PropertyDescriptor descriptor) {
- this.propertySet = propertySet;
- this.descriptor = descriptor;
-
- if (descriptor.getReadMethod() == null) {
- throw new IllegalArgumentException(
- "Bean property has no accessible getter: "
- + propertySet.beanType + "."
- + descriptor.getName());
- }
-
- }
-
- @Override
- public ValueProvider<T, V> getGetter() {
- return bean -> {
- Method readMethod = descriptor.getReadMethod();
- Object value = invokeWrapExceptions(readMethod, bean);
- return getType().cast(value);
- };
- }
-
- @Override
- public Optional<Setter<T, V>> getSetter() {
- Method setter = descriptor.getWriteMethod();
- if (setter == null) {
- return Optional.empty();
- }
-
- return Optional.of(
- (bean, value) -> invokeWrapExceptions(setter, bean, value));
- }
-
- @SuppressWarnings("unchecked")
- @Override
- public Class<V> getType() {
- return (Class<V>) ReflectTools
- .convertPrimitiveType(descriptor.getPropertyType());
- }
-
- @Override
- public String getName() {
- return descriptor.getName();
- }
-
- @Override
- public String getCaption() {
- return SharedUtil.propertyIdToHumanFriendly(getName());
- }
-
- @Override
- public BeanPropertySet<T> getPropertySet() {
- return propertySet;
- }
-
- private Object writeReplace() {
- /*
- * Instead of serializing this actual property definition, only
- * serialize a DTO that when deserialized will get the corresponding
- * property definition from the cache.
- */
- return new SerializedPropertyDefinition(getPropertySet().beanType,
- getName());
- }
- }
-
- private static final ConcurrentMap<Class<?>, BeanPropertySet<?>> instances = new ConcurrentHashMap<>();
-
- private final Class<T> beanType;
-
- private final Map<String, PropertyDefinition<T, ?>> definitions;
-
- private BeanPropertySet(Class<T> beanType) {
- this.beanType = beanType;
-
- try {
- definitions = BeanUtil.getBeanPropertyDescriptors(beanType).stream()
- .filter(BeanPropertySet::hasNonObjectReadMethod)
- .map(descriptor -> new BeanPropertyDefinition<>(this,
- descriptor))
- .collect(Collectors.toMap(PropertyDefinition::getName,
- Function.identity()));
- } catch (IntrospectionException e) {
- throw new IllegalArgumentException(
- "Cannot find property descriptors for "
- + beanType.getName(),
- e);
- }
- }
-
- /**
- * Gets a {@link BeanPropertySet} for the given bean type.
- *
- * @param beanType
- * the bean type to get a property set for, not <code>null</code>
- * @return the bean property set, not <code>null</code>
- */
- @SuppressWarnings("unchecked")
- public static <T> PropertySet<T> get(Class<? extends T> beanType) {
- Objects.requireNonNull(beanType, "Bean type cannot be null");
-
- // Cache the reflection results
- return (PropertySet<T>) instances.computeIfAbsent(beanType,
- BeanPropertySet::new);
- }
-
- @Override
- public Stream<PropertyDefinition<T, ?>> getProperties() {
- return definitions.values().stream();
- }
-
- @Override
- public Optional<PropertyDefinition<T, ?>> getProperty(String name) {
- return Optional.ofNullable(definitions.get(name));
- }
-
- private static boolean hasNonObjectReadMethod(
- PropertyDescriptor descriptor) {
- Method readMethod = descriptor.getReadMethod();
- return readMethod != null
- && readMethod.getDeclaringClass() != Object.class;
- }
-
- private static Object invokeWrapExceptions(Method method, Object target,
- Object... parameters) {
- try {
- return method.invoke(target, parameters);
- } catch (IllegalAccessException | InvocationTargetException e) {
- throw new RuntimeException(e);
- }
- }
-
- @Override
- public String toString() {
- return "Property set for bean " + beanType.getName();
- }
-
- private Object writeReplace() {
- /*
- * Instead of serializing this actual property set, only serialize a DTO
- * that when deserialized will get the corresponding property set from
- * the cache.
- */
- return new SerializedPropertySet(beanType);
- }
- }
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