spring ConstructorArgumentValues 源码
spring ConstructorArgumentValues 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/factory/config/ConstructorArgumentValues.java
/*
* Copyright 2002-2021 the original author or authors.
*
* 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
*
* https://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.springframework.beans.factory.config;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.springframework.beans.BeanMetadataElement;
import org.springframework.beans.Mergeable;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ClassUtils;
import org.springframework.util.ObjectUtils;
/**
* Holder for constructor argument values, typically as part of a bean definition.
*
* <p>Supports values for a specific index in the constructor argument list
* as well as for generic argument matches by type.
*
* @author Juergen Hoeller
* @since 09.11.2003
* @see BeanDefinition#getConstructorArgumentValues
*/
public class ConstructorArgumentValues {
private final Map<Integer, ValueHolder> indexedArgumentValues = new LinkedHashMap<>();
private final List<ValueHolder> genericArgumentValues = new ArrayList<>();
/**
* Create a new empty ConstructorArgumentValues object.
*/
public ConstructorArgumentValues() {
}
/**
* Deep copy constructor.
* @param original the ConstructorArgumentValues to copy
*/
public ConstructorArgumentValues(ConstructorArgumentValues original) {
addArgumentValues(original);
}
/**
* Copy all given argument values into this object, using separate holder
* instances to keep the values independent of the original object.
* <p>Note: Identical ValueHolder instances will only be registered once,
* to allow for merging and re-merging of argument value definitions. Distinct
* ValueHolder instances carrying the same content are of course allowed.
*/
public void addArgumentValues(@Nullable ConstructorArgumentValues other) {
if (other != null) {
other.indexedArgumentValues.forEach(
(index, argValue) -> addOrMergeIndexedArgumentValue(index, argValue.copy())
);
other.genericArgumentValues.stream()
.filter(valueHolder -> !this.genericArgumentValues.contains(valueHolder))
.forEach(valueHolder -> addOrMergeGenericArgumentValue(valueHolder.copy()));
}
}
/**
* Add an argument value for the given index in the constructor argument list.
* @param index the index in the constructor argument list
* @param value the argument value
*/
public void addIndexedArgumentValue(int index, @Nullable Object value) {
addIndexedArgumentValue(index, new ValueHolder(value));
}
/**
* Add an argument value for the given index in the constructor argument list.
* @param index the index in the constructor argument list
* @param value the argument value
* @param type the type of the constructor argument
*/
public void addIndexedArgumentValue(int index, @Nullable Object value, String type) {
addIndexedArgumentValue(index, new ValueHolder(value, type));
}
/**
* Add an argument value for the given index in the constructor argument list.
* @param index the index in the constructor argument list
* @param newValue the argument value in the form of a ValueHolder
*/
public void addIndexedArgumentValue(int index, ValueHolder newValue) {
Assert.isTrue(index >= 0, "Index must not be negative");
Assert.notNull(newValue, "ValueHolder must not be null");
addOrMergeIndexedArgumentValue(index, newValue);
}
/**
* Add an argument value for the given index in the constructor argument list,
* merging the new value (typically a collection) with the current value
* if demanded: see {@link org.springframework.beans.Mergeable}.
* @param key the index in the constructor argument list
* @param newValue the argument value in the form of a ValueHolder
*/
private void addOrMergeIndexedArgumentValue(Integer key, ValueHolder newValue) {
ValueHolder currentValue = this.indexedArgumentValues.get(key);
if (currentValue != null && newValue.getValue() instanceof Mergeable mergeable) {
if (mergeable.isMergeEnabled()) {
newValue.setValue(mergeable.merge(currentValue.getValue()));
}
}
this.indexedArgumentValues.put(key, newValue);
}
/**
* Check whether an argument value has been registered for the given index.
* @param index the index in the constructor argument list
*/
public boolean hasIndexedArgumentValue(int index) {
return this.indexedArgumentValues.containsKey(index);
}
/**
* Get argument value for the given index in the constructor argument list.
* @param index the index in the constructor argument list
* @param requiredType the type to match (can be {@code null} to match
* untyped values only)
* @return the ValueHolder for the argument, or {@code null} if none set
*/
@Nullable
public ValueHolder getIndexedArgumentValue(int index, @Nullable Class<?> requiredType) {
return getIndexedArgumentValue(index, requiredType, null);
}
/**
* Get argument value for the given index in the constructor argument list.
* @param index the index in the constructor argument list
* @param requiredType the type to match (can be {@code null} to match
* untyped values only)
* @param requiredName the type to match (can be {@code null} to match
* unnamed values only, or empty String to match any name)
* @return the ValueHolder for the argument, or {@code null} if none set
*/
@Nullable
public ValueHolder getIndexedArgumentValue(int index, @Nullable Class<?> requiredType, @Nullable String requiredName) {
Assert.isTrue(index >= 0, "Index must not be negative");
ValueHolder valueHolder = this.indexedArgumentValues.get(index);
if (valueHolder != null &&
(valueHolder.getType() == null || (requiredType != null &&
ClassUtils.matchesTypeName(requiredType, valueHolder.getType()))) &&
(valueHolder.getName() == null || (requiredName != null &&
(requiredName.isEmpty() || requiredName.equals(valueHolder.getName()))))) {
return valueHolder;
}
return null;
}
/**
* Return the map of indexed argument values.
* @return unmodifiable Map with Integer index as key and ValueHolder as value
* @see ValueHolder
*/
public Map<Integer, ValueHolder> getIndexedArgumentValues() {
return Collections.unmodifiableMap(this.indexedArgumentValues);
}
/**
* Add a generic argument value to be matched by type.
* <p>Note: A single generic argument value will just be used once,
* rather than matched multiple times.
* @param value the argument value
*/
public void addGenericArgumentValue(Object value) {
this.genericArgumentValues.add(new ValueHolder(value));
}
/**
* Add a generic argument value to be matched by type.
* <p>Note: A single generic argument value will just be used once,
* rather than matched multiple times.
* @param value the argument value
* @param type the type of the constructor argument
*/
public void addGenericArgumentValue(Object value, String type) {
this.genericArgumentValues.add(new ValueHolder(value, type));
}
/**
* Add a generic argument value to be matched by type or name (if available).
* <p>Note: A single generic argument value will just be used once,
* rather than matched multiple times.
* @param newValue the argument value in the form of a ValueHolder
* <p>Note: Identical ValueHolder instances will only be registered once,
* to allow for merging and re-merging of argument value definitions. Distinct
* ValueHolder instances carrying the same content are of course allowed.
*/
public void addGenericArgumentValue(ValueHolder newValue) {
Assert.notNull(newValue, "ValueHolder must not be null");
if (!this.genericArgumentValues.contains(newValue)) {
addOrMergeGenericArgumentValue(newValue);
}
}
/**
* Add a generic argument value, merging the new value (typically a collection)
* with the current value if demanded: see {@link org.springframework.beans.Mergeable}.
* @param newValue the argument value in the form of a ValueHolder
*/
private void addOrMergeGenericArgumentValue(ValueHolder newValue) {
if (newValue.getName() != null) {
for (Iterator<ValueHolder> it = this.genericArgumentValues.iterator(); it.hasNext();) {
ValueHolder currentValue = it.next();
if (newValue.getName().equals(currentValue.getName())) {
if (newValue.getValue() instanceof Mergeable mergeable) {
if (mergeable.isMergeEnabled()) {
newValue.setValue(mergeable.merge(currentValue.getValue()));
}
}
it.remove();
}
}
}
this.genericArgumentValues.add(newValue);
}
/**
* Look for a generic argument value that matches the given type.
* @param requiredType the type to match
* @return the ValueHolder for the argument, or {@code null} if none set
*/
@Nullable
public ValueHolder getGenericArgumentValue(Class<?> requiredType) {
return getGenericArgumentValue(requiredType, null, null);
}
/**
* Look for a generic argument value that matches the given type.
* @param requiredType the type to match
* @param requiredName the name to match
* @return the ValueHolder for the argument, or {@code null} if none set
*/
@Nullable
public ValueHolder getGenericArgumentValue(Class<?> requiredType, String requiredName) {
return getGenericArgumentValue(requiredType, requiredName, null);
}
/**
* Look for the next generic argument value that matches the given type,
* ignoring argument values that have already been used in the current
* resolution process.
* @param requiredType the type to match (can be {@code null} to find
* an arbitrary next generic argument value)
* @param requiredName the name to match (can be {@code null} to not
* match argument values by name, or empty String to match any name)
* @param usedValueHolders a Set of ValueHolder objects that have already been used
* in the current resolution process and should therefore not be returned again
* @return the ValueHolder for the argument, or {@code null} if none found
*/
@Nullable
public ValueHolder getGenericArgumentValue(@Nullable Class<?> requiredType, @Nullable String requiredName,
@Nullable Set<ValueHolder> usedValueHolders) {
for (ValueHolder valueHolder : this.genericArgumentValues) {
if (usedValueHolders != null && usedValueHolders.contains(valueHolder)) {
continue;
}
if (valueHolder.getName() != null && (requiredName == null ||
(!requiredName.isEmpty() && !requiredName.equals(valueHolder.getName())))) {
continue;
}
if (valueHolder.getType() != null && (requiredType == null ||
!ClassUtils.matchesTypeName(requiredType, valueHolder.getType()))) {
continue;
}
if (requiredType != null && valueHolder.getType() == null && valueHolder.getName() == null &&
!ClassUtils.isAssignableValue(requiredType, valueHolder.getValue())) {
continue;
}
return valueHolder;
}
return null;
}
/**
* Return the list of generic argument values.
* @return unmodifiable List of ValueHolders
* @see ValueHolder
*/
public List<ValueHolder> getGenericArgumentValues() {
return Collections.unmodifiableList(this.genericArgumentValues);
}
/**
* Look for an argument value that either corresponds to the given index
* in the constructor argument list or generically matches by type.
* @param index the index in the constructor argument list
* @param requiredType the parameter type to match
* @return the ValueHolder for the argument, or {@code null} if none set
*/
@Nullable
public ValueHolder getArgumentValue(int index, Class<?> requiredType) {
return getArgumentValue(index, requiredType, null, null);
}
/**
* Look for an argument value that either corresponds to the given index
* in the constructor argument list or generically matches by type.
* @param index the index in the constructor argument list
* @param requiredType the parameter type to match
* @param requiredName the parameter name to match
* @return the ValueHolder for the argument, or {@code null} if none set
*/
@Nullable
public ValueHolder getArgumentValue(int index, Class<?> requiredType, String requiredName) {
return getArgumentValue(index, requiredType, requiredName, null);
}
/**
* Look for an argument value that either corresponds to the given index
* in the constructor argument list or generically matches by type.
* @param index the index in the constructor argument list
* @param requiredType the parameter type to match (can be {@code null}
* to find an untyped argument value)
* @param requiredName the parameter name to match (can be {@code null}
* to find an unnamed argument value, or empty String to match any name)
* @param usedValueHolders a Set of ValueHolder objects that have already
* been used in the current resolution process and should therefore not
* be returned again (allowing to return the next generic argument match
* in case of multiple generic argument values of the same type)
* @return the ValueHolder for the argument, or {@code null} if none set
*/
@Nullable
public ValueHolder getArgumentValue(int index, @Nullable Class<?> requiredType,
@Nullable String requiredName, @Nullable Set<ValueHolder> usedValueHolders) {
Assert.isTrue(index >= 0, "Index must not be negative");
ValueHolder valueHolder = getIndexedArgumentValue(index, requiredType, requiredName);
if (valueHolder == null) {
valueHolder = getGenericArgumentValue(requiredType, requiredName, usedValueHolders);
}
return valueHolder;
}
/**
* Return the number of argument values held in this instance,
* counting both indexed and generic argument values.
*/
public int getArgumentCount() {
return (this.indexedArgumentValues.size() + this.genericArgumentValues.size());
}
/**
* Return if this holder does not contain any argument values,
* neither indexed ones nor generic ones.
*/
public boolean isEmpty() {
return (this.indexedArgumentValues.isEmpty() && this.genericArgumentValues.isEmpty());
}
/**
* Clear this holder, removing all argument values.
*/
public void clear() {
this.indexedArgumentValues.clear();
this.genericArgumentValues.clear();
}
@Override
public boolean equals(@Nullable Object other) {
if (this == other) {
return true;
}
if (!(other instanceof ConstructorArgumentValues that)) {
return false;
}
if (this.genericArgumentValues.size() != that.genericArgumentValues.size() ||
this.indexedArgumentValues.size() != that.indexedArgumentValues.size()) {
return false;
}
Iterator<ValueHolder> it1 = this.genericArgumentValues.iterator();
Iterator<ValueHolder> it2 = that.genericArgumentValues.iterator();
while (it1.hasNext() && it2.hasNext()) {
ValueHolder vh1 = it1.next();
ValueHolder vh2 = it2.next();
if (!vh1.contentEquals(vh2)) {
return false;
}
}
for (Map.Entry<Integer, ValueHolder> entry : this.indexedArgumentValues.entrySet()) {
ValueHolder vh1 = entry.getValue();
ValueHolder vh2 = that.indexedArgumentValues.get(entry.getKey());
if (vh2 == null || !vh1.contentEquals(vh2)) {
return false;
}
}
return true;
}
@Override
public int hashCode() {
int hashCode = 7;
for (ValueHolder valueHolder : this.genericArgumentValues) {
hashCode = 31 * hashCode + valueHolder.contentHashCode();
}
hashCode = 29 * hashCode;
for (Map.Entry<Integer, ValueHolder> entry : this.indexedArgumentValues.entrySet()) {
hashCode = 31 * hashCode + (entry.getValue().contentHashCode() ^ entry.getKey().hashCode());
}
return hashCode;
}
/**
* Holder for a constructor argument value, with an optional type
* attribute indicating the target type of the actual constructor argument.
*/
public static class ValueHolder implements BeanMetadataElement {
@Nullable
private Object value;
@Nullable
private String type;
@Nullable
private String name;
@Nullable
private Object source;
private boolean converted = false;
@Nullable
private Object convertedValue;
/**
* Create a new ValueHolder for the given value.
* @param value the argument value
*/
public ValueHolder(@Nullable Object value) {
this.value = value;
}
/**
* Create a new ValueHolder for the given value and type.
* @param value the argument value
* @param type the type of the constructor argument
*/
public ValueHolder(@Nullable Object value, @Nullable String type) {
this.value = value;
this.type = type;
}
/**
* Create a new ValueHolder for the given value, type and name.
* @param value the argument value
* @param type the type of the constructor argument
* @param name the name of the constructor argument
*/
public ValueHolder(@Nullable Object value, @Nullable String type, @Nullable String name) {
this.value = value;
this.type = type;
this.name = name;
}
/**
* Set the value for the constructor argument.
*/
public void setValue(@Nullable Object value) {
this.value = value;
}
/**
* Return the value for the constructor argument.
*/
@Nullable
public Object getValue() {
return this.value;
}
/**
* Set the type of the constructor argument.
*/
public void setType(@Nullable String type) {
this.type = type;
}
/**
* Return the type of the constructor argument.
*/
@Nullable
public String getType() {
return this.type;
}
/**
* Set the name of the constructor argument.
*/
public void setName(@Nullable String name) {
this.name = name;
}
/**
* Return the name of the constructor argument.
*/
@Nullable
public String getName() {
return this.name;
}
/**
* Set the configuration source {@code Object} for this metadata element.
* <p>The exact type of the object will depend on the configuration mechanism used.
*/
public void setSource(@Nullable Object source) {
this.source = source;
}
@Override
@Nullable
public Object getSource() {
return this.source;
}
/**
* Return whether this holder contains a converted value already ({@code true}),
* or whether the value still needs to be converted ({@code false}).
*/
public synchronized boolean isConverted() {
return this.converted;
}
/**
* Set the converted value of the constructor argument,
* after processed type conversion.
*/
public synchronized void setConvertedValue(@Nullable Object value) {
this.converted = (value != null);
this.convertedValue = value;
}
/**
* Return the converted value of the constructor argument,
* after processed type conversion.
*/
@Nullable
public synchronized Object getConvertedValue() {
return this.convertedValue;
}
/**
* Determine whether the content of this ValueHolder is equal
* to the content of the given other ValueHolder.
* <p>Note that ValueHolder does not implement {@code equals}
* directly, to allow for multiple ValueHolder instances with the
* same content to reside in the same Set.
*/
private boolean contentEquals(ValueHolder other) {
return (this == other ||
(ObjectUtils.nullSafeEquals(this.value, other.value) && ObjectUtils.nullSafeEquals(this.type, other.type)));
}
/**
* Determine whether the hash code of the content of this ValueHolder.
* <p>Note that ValueHolder does not implement {@code hashCode}
* directly, to allow for multiple ValueHolder instances with the
* same content to reside in the same Set.
*/
private int contentHashCode() {
return ObjectUtils.nullSafeHashCode(this.value) * 29 + ObjectUtils.nullSafeHashCode(this.type);
}
/**
* Create a copy of this ValueHolder: that is, an independent
* ValueHolder instance with the same contents.
*/
public ValueHolder copy() {
ValueHolder copy = new ValueHolder(this.value, this.type, this.name);
copy.setSource(this.source);
return copy;
}
}
}
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