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- /*
- * Copyright 2000-2018 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.HashMap;
- import java.util.List;
- 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;
-
- /**
- * A {@link PropertySet} that uses reflection to find bean properties.
- *
- * @author Vaadin Ltd
- *
- * @since 8.0
- *
- * @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<T> implements Serializable {
- private final InstanceKey<T> instanceKey;
-
- private SerializedPropertySet(InstanceKey<T> instanceKey) {
- this.instanceKey = instanceKey;
- }
-
- 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(instanceKey.type, instanceKey.checkNestedDefinitions,
- new PropertyFilterDefinition(instanceKey.depth,
- instanceKey.ignorePackageNames));
- }
- }
-
- /**
- * 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>
- extends AbstractBeanPropertyDefinition<T, V> {
-
- public BeanPropertyDefinition(BeanPropertySet<T> propertySet,
- Class<T> propertyHolderType, PropertyDescriptor descriptor) {
- super(propertySet, propertyHolderType, descriptor);
- }
-
- @Override
- public ValueProvider<T, V> getGetter() {
- return bean -> {
- Method readMethod = getDescriptor().getReadMethod();
- Object value = invokeWrapExceptions(readMethod, bean);
- return getType().cast(value);
- };
- }
-
- @Override
- public Optional<Setter<T, V>> getSetter() {
- if (getDescriptor().getWriteMethod() == null) {
- return Optional.empty();
- }
-
- Setter<T, V> setter = (bean, value) -> {
- // Do not "optimize" this getter call,
- // if its done outside the code block, that will produce
- // NotSerializableException because of some lambda compilation
- // magic
- Method innerSetter = getDescriptor().getWriteMethod();
- invokeWrapExceptions(innerSetter, bean, value);
- };
- return Optional.of(setter);
- }
-
- 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().instanceKey.type, getName());
- }
- }
-
- /**
- * Contains properties for a bean type which is nested in another
- * definition.
- *
- * @since 8.1
- * @param <T>
- * the bean type
- * @param <V>
- * the value type returned by the getter and set by the setter
- */
- public static class NestedBeanPropertyDefinition<T, V>
- extends AbstractBeanPropertyDefinition<T, V> {
-
- /**
- * Default maximum depth for scanning nested properties.
- *
- * @since 8.2
- */
- protected static final int MAX_PROPERTY_NESTING_DEPTH = 10;
-
- private final PropertyDefinition<T, ?> parent;
-
- public NestedBeanPropertyDefinition(BeanPropertySet<T> propertySet,
- PropertyDefinition<T, ?> parent,
- PropertyDescriptor descriptor) {
- super(propertySet, parent.getType(), descriptor);
- this.parent = parent;
- }
-
- @Override
- public ValueProvider<T, V> getGetter() {
- return bean -> {
- Method readMethod = getDescriptor().getReadMethod();
- Object value = invokeWrapExceptions(readMethod,
- parent.getGetter().apply(bean));
- return getType().cast(value);
- };
- }
-
- @Override
- public Optional<Setter<T, V>> getSetter() {
- if (getDescriptor().getWriteMethod() == null) {
- return Optional.empty();
- }
-
- Setter<T, V> setter = (bean, value) -> {
- // Do not "optimize" this getter call,
- // if its done outside the code block, that will produce
- // NotSerializableException because of some lambda compilation
- // magic
- Method innerSetter = getDescriptor().getWriteMethod();
- invokeWrapExceptions(innerSetter,
- parent.getGetter().apply(bean), value);
- };
- return Optional.of(setter);
- }
-
- @Override
- public String getName() {
- return parent.getName() + "." + super.getName();
- }
-
- @Override
- public String getTopLevelName() {
- return super.getName();
- }
-
- 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().instanceKey.type, getName());
- }
-
- /**
- * Gets the parent property definition.
- *
- * @return the property definition for the parent
- */
- public PropertyDefinition<T, ?> getParent() {
- return parent;
- }
- }
-
- /**
- * Key for identifying cached BeanPropertySet instances.
- *
- * @since 8.2
- */
- private static class InstanceKey<T> implements Serializable {
- private Class<T> type;
- private boolean checkNestedDefinitions;
- private int depth;
- private List<String> ignorePackageNames;
-
- public InstanceKey(Class<T> type, boolean checkNestedDefinitions,
- int depth, List<String> ignorePackageNames) {
- this.type = type;
- this.checkNestedDefinitions = checkNestedDefinitions;
- this.depth = depth;
- this.ignorePackageNames = ignorePackageNames;
- }
-
- @Override
- public int hashCode() {
- final int prime = 31;
- int result = 1;
- result = prime * result + (checkNestedDefinitions ? 1231 : 1237);
- result = prime * result + depth;
- result = prime * result + ((ignorePackageNames == null) ? 0
- : ignorePackageNames.hashCode());
- result = prime * result + ((type == null) ? 0 : type.hashCode());
- return result;
- }
-
- @Override
- public boolean equals(Object obj) {
- if (this == obj) {
- return true;
- }
- if (obj == null) {
- return false;
- }
- if (getClass() != obj.getClass()) {
- return false;
- }
- InstanceKey other = (InstanceKey) obj;
- if (checkNestedDefinitions != other.checkNestedDefinitions) {
- return false;
- }
- if (depth != other.depth) {
- return false;
- }
- if (ignorePackageNames == null) {
- if (other.ignorePackageNames != null) {
- return false;
- }
- } else if (!ignorePackageNames.equals(other.ignorePackageNames)) {
- return false;
- }
- return Objects.equals(type, other.type);
- }
-
- }
-
- private static final ConcurrentMap<InstanceKey<?>, BeanPropertySet<?>> INSTANCES = new ConcurrentHashMap<>();
-
- private final InstanceKey<T> instanceKey;
-
- private final Map<String, PropertyDefinition<T, ?>> definitions;
-
- private BeanPropertySet(InstanceKey<T> instanceKey) {
- this.instanceKey = instanceKey;
-
- try {
- definitions = BeanUtil.getBeanPropertyDescriptors(instanceKey.type)
- .stream().filter(BeanPropertySet::hasNonObjectReadMethod)
- .map(descriptor -> new BeanPropertyDefinition<>(this,
- instanceKey.type, descriptor))
- .collect(Collectors.toMap(PropertyDefinition::getName,
- Function.identity()));
- } catch (IntrospectionException e) {
- throw new IllegalArgumentException(
- "Cannot find property descriptors for "
- + instanceKey.type.getName(),
- e);
- }
- }
-
- private BeanPropertySet(InstanceKey<T> instanceKey,
- Map<String, PropertyDefinition<T, ?>> definitions) {
- this.instanceKey = instanceKey;
- this.definitions = new HashMap<>(definitions);
- }
-
- private BeanPropertySet(InstanceKey<T> instanceKey,
- boolean checkNestedDefinitions,
- PropertyFilterDefinition propertyFilterDefinition) {
- this(instanceKey);
- if (checkNestedDefinitions) {
- Objects.requireNonNull(propertyFilterDefinition,
- "You must define a property filter callback if using nested property scan.");
- findNestedDefinitions(definitions, 0, propertyFilterDefinition);
- }
- }
-
- private void findNestedDefinitions(
- Map<String, PropertyDefinition<T, ?>> parentDefinitions, int depth,
- PropertyFilterDefinition filterCallback) {
- if (depth >= filterCallback.getMaxNestingDepth()) {
- return;
- }
- if (parentDefinitions == null) {
- return;
- }
- Map<String, PropertyDefinition<T, ?>> moreProps = new HashMap<>();
- for (String parentPropertyKey : parentDefinitions.keySet()) {
- PropertyDefinition<T, ?> parentProperty = parentDefinitions
- .get(parentPropertyKey);
- Class<?> type = parentProperty.getType();
- if (type.getPackage() == null || type.isEnum()) {
- continue;
- }
- String packageName = type.getPackage().getName();
- if (filterCallback.getIgnorePackageNamesStartingWith().stream()
- .anyMatch(prefix -> packageName.startsWith(prefix))) {
- continue;
- }
-
- try {
- List<PropertyDescriptor> descriptors = BeanUtil
- .getBeanPropertyDescriptors(type).stream()
- .filter(BeanPropertySet::hasNonObjectReadMethod)
- .collect(Collectors.toList());
- for (PropertyDescriptor descriptor : descriptors) {
- String name = parentPropertyKey + "."
- + descriptor.getName();
- PropertyDescriptor subDescriptor = BeanUtil
- .getPropertyDescriptor(instanceKey.type, name);
- moreProps.put(name, new NestedBeanPropertyDefinition<>(this,
- parentProperty, subDescriptor));
-
- }
- } catch (IntrospectionException e) {
- throw new IllegalArgumentException(
- "Error finding nested property descriptors for "
- + type.getName(),
- e);
- }
- }
- if (moreProps.size() > 0) {
- definitions.putAll(moreProps);
- findNestedDefinitions(moreProps, ++depth, filterCallback);
- }
-
- }
-
- /**
- * 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");
- InstanceKey key = new InstanceKey(beanType, false, 0, null);
- // Cache the reflection results
- return (PropertySet<T>) INSTANCES
- .computeIfAbsent(key, ignored -> new BeanPropertySet<>(key))
- .copy();
- }
-
- private BeanPropertySet<T> copy() {
- return new BeanPropertySet<>(instanceKey, definitions);
- }
-
- /**
- * Gets a {@link BeanPropertySet} for the given bean type.
- *
- * @param beanType
- * the bean type to get a property set for, not <code>null</code>
- * @param checkNestedDefinitions
- * whether to scan for nested definitions in beanType
- * @param filterDefinition
- * filtering conditions for nested properties
- * @return the bean property set, not <code>null</code>
- * @since 8.2
- */
- @SuppressWarnings("unchecked")
- public static <T> PropertySet<T> get(Class<? extends T> beanType,
- boolean checkNestedDefinitions,
- PropertyFilterDefinition filterDefinition) {
- Objects.requireNonNull(beanType, "Bean type cannot be null");
- InstanceKey key = new InstanceKey(beanType, false,
- filterDefinition.getMaxNestingDepth(),
- filterDefinition.getIgnorePackageNamesStartingWith());
- return (PropertySet<T>) INSTANCES
- .computeIfAbsent(key, k -> new BeanPropertySet<>(key,
- checkNestedDefinitions, filterDefinition))
- .copy();
- }
-
- @Override
- public Stream<PropertyDefinition<T, ?>> getProperties() {
- return definitions.values().stream();
- }
-
- @Override
- public Optional<PropertyDefinition<T, ?>> getProperty(String name)
- throws IllegalArgumentException {
- Optional<PropertyDefinition<T, ?>> definition = Optional
- .ofNullable(definitions.get(name));
- if (!definition.isPresent() && name.contains(".")) {
- try {
- String parentName = name.substring(0, name.lastIndexOf('.'));
- Optional<PropertyDefinition<T, ?>> parent = getProperty(
- parentName);
- if (!parent.isPresent()) {
- throw new IllegalArgumentException(
- "Cannot find property descriptor [" + parentName
- + "] for " + instanceKey.type.getName());
- }
-
- Optional<PropertyDescriptor> descriptor = Optional.ofNullable(
- BeanUtil.getPropertyDescriptor(instanceKey.type, name));
- if (descriptor.isPresent()) {
- NestedBeanPropertyDefinition<T, ?> nestedDefinition = new NestedBeanPropertyDefinition<>(
- this, parent.get(), descriptor.get());
- definitions.put(name, nestedDefinition);
- return Optional.of(nestedDefinition);
- } else {
- throw new IllegalArgumentException(
- "Cannot find property descriptor [" + name
- + "] for " + instanceKey.type.getName());
- }
-
- } catch (IntrospectionException e) {
- throw new IllegalArgumentException(
- "Cannot find property descriptors for "
- + instanceKey.type.getName(),
- e);
- }
- }
- return definition;
- }
-
- /**
- * Gets the bean type of this bean property set.
- *
- * @since 8.2
- * @return the bean type of this bean property set
- */
- public Class<T> getBeanType() {
- return instanceKey.type;
- }
-
- 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 " + instanceKey.type.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(instanceKey);
- }
- }
|