infra.beans.factory.support.PropertiesBeanDefinitionReader Maven / Gradle / Ivy
/*
* Copyright 2017 - 2024 the original author or authors.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see [https://www.gnu.org/licenses/]
*/
package infra.beans.factory.support;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.Enumeration;
import java.util.HashMap;
import java.util.Map;
import java.util.Properties;
import java.util.ResourceBundle;
import infra.beans.BeansException;
import infra.beans.PropertyAccessor;
import infra.beans.PropertyValues;
import infra.beans.factory.BeanClassLoadFailedException;
import infra.beans.factory.BeanDefinitionStoreException;
import infra.beans.factory.config.BeanDefinition;
import infra.beans.factory.config.ConstructorArgumentValues;
import infra.beans.factory.config.RuntimeBeanReference;
import infra.core.io.EncodedResource;
import infra.core.io.Resource;
import infra.lang.Nullable;
import infra.util.DefaultPropertiesPersister;
import infra.util.PropertiesPersister;
import infra.util.StringUtils;
/**
* Bean definition reader for a simple properties format.
*
* Provides bean definition registration methods for Map/Properties and
* ResourceBundle. Typically applied to a StandardBeanFactory.
*
*
Example:
*
*
* employee.(class)=MyClass // bean is of class MyClass
* employee.(abstract)=true // this bean can't be instantiated directly
* employee.group=Insurance // real property
* employee.usesDialUp=false // real property (potentially overridden)
*
* salesrep.(parent)=employee // derives from "employee" bean definition
* salesrep.(lazy-init)=true // lazily initialize this singleton bean
* salesrep.manager(ref)=tony // reference to another bean
* salesrep.department=Sales // real property
*
* techie.(parent)=employee // derives from "employee" bean definition
* techie.(scope)=prototype // bean is a prototype (not a shared instance)
* techie.manager(ref)=jeff // reference to another bean
* techie.department=Engineering // real property
* techie.usesDialUp=true // real property (overriding parent value)
*
* ceo.$0(ref)=secretary // inject 'secretary' bean as 0th constructor arg
* ceo.$1=1000000 // inject value '1000000' at 1st constructor arg
*
*
* @author Rod Johnson
* @author Juergen Hoeller
* @author Rob Harrop
* @author Harry Yang
* @see StandardBeanFactory
* @since 4.0 2022/3/19 18:33
*/
public class PropertiesBeanDefinitionReader extends AbstractBeanDefinitionReader {
/**
* Value of a T/F attribute that represents true.
* Anything else represents false. Case seNsItive.
*/
public static final String TRUE_VALUE = "true";
/**
* Separator between bean name and property name.
* We follow normal Java conventions.
*/
public static final String SEPARATOR = ".";
/**
* Special key to distinguish {@code owner.(class)=com.myapp.MyClass}.
*/
public static final String CLASS_KEY = "(class)";
/**
* Special key to distinguish {@code owner.(parent)=parentBeanName}.
*/
public static final String PARENT_KEY = "(parent)";
/**
* Special key to distinguish {@code owner.(scope)=prototype}.
* Default is "true".
*/
public static final String SCOPE_KEY = "(scope)";
/**
* Special key to distinguish {@code owner.(singleton)=false}.
* Default is "true".
*/
public static final String SINGLETON_KEY = "(singleton)";
/**
* Special key to distinguish {@code owner.(abstract)=true}
* Default is "false".
*/
public static final String ABSTRACT_KEY = "(abstract)";
/**
* Special key to distinguish {@code owner.(lazy-init)=true}
* Default is "false".
*/
public static final String LAZY_INIT_KEY = "(lazy-init)";
/**
* Property suffix for references to other beans in the current
* BeanFactory: e.g. {@code owner.dog(ref)=fido}.
* Whether this is a reference to a singleton or a prototype
* will depend on the definition of the target bean.
*/
public static final String REF_SUFFIX = "(ref)";
/**
* Prefix before values referencing other beans.
*/
public static final String REF_PREFIX = "*";
/**
* Prefix used to denote a constructor argument definition.
*/
public static final String CONSTRUCTOR_ARG_PREFIX = "$";
@Nullable
private String defaultParentBean;
private PropertiesPersister propertiesPersister = DefaultPropertiesPersister.INSTANCE;
/**
* Create new PropertiesBeanDefinitionReader for the given bean factory.
*
* @param registry the BeanFactory to load bean definitions into,
* in the form of a BeanDefinitionRegistry
*/
public PropertiesBeanDefinitionReader(BeanDefinitionRegistry registry) {
super(registry);
}
/**
* Set the default parent bean for this bean factory.
* If a child bean definition handled by this factory provides neither
* a parent nor a class attribute, this default value gets used.
* Can be used e.g. for view definition files, to define a parent
* with a default view class and common attributes for all views.
* View definitions that define their own parent or carry their own
* class can still override this.
*
Strictly speaking, the rule that a default parent setting does
* not apply to a bean definition that carries a class is there for
* backwards compatibility reasons. It still matches the typical use case.
*/
public void setDefaultParentBean(@Nullable String defaultParentBean) {
this.defaultParentBean = defaultParentBean;
}
/**
* Return the default parent bean for this bean factory.
*/
@Nullable
public String getDefaultParentBean() {
return this.defaultParentBean;
}
/**
* Set the PropertiesPersister to use for parsing properties files.
* The default is ResourcePropertiesPersister.
*
* @see DefaultPropertiesPersister#INSTANCE
*/
public void setPropertiesPersister(@Nullable PropertiesPersister propertiesPersister) {
this.propertiesPersister =
(propertiesPersister != null ? propertiesPersister : DefaultPropertiesPersister.INSTANCE);
}
/**
* Return the PropertiesPersister to use for parsing properties files.
*/
public PropertiesPersister getPropertiesPersister() {
return this.propertiesPersister;
}
/**
* Load bean definitions from the specified properties file,
* using all property keys (i.e. not filtering by prefix).
*
* @param resource the resource descriptor for the properties file
* @return the number of bean definitions found
* @throws BeanDefinitionStoreException in case of loading or parsing errors
* @see #loadBeanDefinitions(Resource, String)
*/
@Override
public int loadBeanDefinitions(Resource resource) throws BeanDefinitionStoreException {
return loadBeanDefinitions(new EncodedResource(resource), null);
}
/**
* Load bean definitions from the specified properties file.
*
* @param resource the resource descriptor for the properties file
* @param prefix a filter within the keys in the map: e.g. 'beans.'
* (can be empty or {@code null})
* @return the number of bean definitions found
* @throws BeanDefinitionStoreException in case of loading or parsing errors
*/
public int loadBeanDefinitions(Resource resource, @Nullable String prefix) throws BeanDefinitionStoreException {
return loadBeanDefinitions(new EncodedResource(resource), prefix);
}
/**
* Load bean definitions from the specified properties file.
*
* @param encodedResource the resource descriptor for the properties file,
* allowing to specify an encoding to use for parsing the file
* @return the number of bean definitions found
* @throws BeanDefinitionStoreException in case of loading or parsing errors
*/
public int loadBeanDefinitions(EncodedResource encodedResource) throws BeanDefinitionStoreException {
return loadBeanDefinitions(encodedResource, null);
}
/**
* Load bean definitions from the specified properties file.
*
* @param encodedResource the resource descriptor for the properties file,
* allowing to specify an encoding to use for parsing the file
* @param prefix a filter within the keys in the map: e.g. 'beans.'
* (can be empty or {@code null})
* @return the number of bean definitions found
* @throws BeanDefinitionStoreException in case of loading or parsing errors
*/
public int loadBeanDefinitions(EncodedResource encodedResource, @Nullable String prefix)
throws BeanDefinitionStoreException {
if (logger.isTraceEnabled()) {
logger.trace("Loading properties bean definitions from {}", encodedResource);
}
Properties props = new Properties();
try {
try (InputStream is = encodedResource.getResource().getInputStream()) {
if (encodedResource.getEncoding() != null) {
getPropertiesPersister().load(props, new InputStreamReader(is, encodedResource.getEncoding()));
}
else {
getPropertiesPersister().load(props, is);
}
}
int count = registerBeanDefinitions(props, prefix, encodedResource.getResource().toString());
if (logger.isDebugEnabled()) {
logger.debug("Loaded {} bean definitions from {}", count, encodedResource);
}
return count;
}
catch (IOException ex) {
throw new BeanDefinitionStoreException("Could not parse properties from " + encodedResource.getResource(), ex);
}
}
/**
* Register bean definitions contained in a resource bundle,
* using all property keys (i.e. not filtering by prefix).
*
* @param rb the ResourceBundle to load from
* @return the number of bean definitions found
* @throws BeanDefinitionStoreException in case of loading or parsing errors
* @see #registerBeanDefinitions(java.util.ResourceBundle, String)
*/
public int registerBeanDefinitions(ResourceBundle rb) throws BeanDefinitionStoreException {
return registerBeanDefinitions(rb, null);
}
/**
* Register bean definitions contained in a ResourceBundle.
*
Similar syntax as for a Map. This method is useful to enable
* standard Java internationalization support.
*
* @param rb the ResourceBundle to load from
* @param prefix a filter within the keys in the map: e.g. 'beans.'
* (can be empty or {@code null})
* @return the number of bean definitions found
* @throws BeanDefinitionStoreException in case of loading or parsing errors
*/
public int registerBeanDefinitions(ResourceBundle rb, @Nullable String prefix) throws BeanDefinitionStoreException {
// Simply create a map and call overloaded method.
Map map = new HashMap<>();
Enumeration keys = rb.getKeys();
while (keys.hasMoreElements()) {
String key = keys.nextElement();
map.put(key, rb.getObject(key));
}
return registerBeanDefinitions(map, prefix);
}
/**
* Register bean definitions contained in a Map, using all property keys (i.e. not
* filtering by prefix).
*
* @param map a map of {@code name} to {@code property} (String or Object). Property
* values will be strings if coming from a Properties file etc. Property names
* (keys) must be Strings. Class keys must be Strings.
* @return the number of bean definitions found
* @throws BeansException in case of loading or parsing errors
* @see #registerBeanDefinitions(java.util.Map, String, String)
*/
public int registerBeanDefinitions(Map map) throws BeansException {
return registerBeanDefinitions(map, null);
}
/**
* Register bean definitions contained in a Map.
* Ignore ineligible properties.
*
* @param map a map of {@code name} to {@code property} (String or Object). Property
* values will be strings if coming from a Properties file etc. Property names
* (keys) must be Strings. Class keys must be Strings.
* @param prefix a filter within the keys in the map: e.g. 'beans.'
* (can be empty or {@code null})
* @return the number of bean definitions found
* @throws BeansException in case of loading or parsing errors
*/
public int registerBeanDefinitions(Map map, @Nullable String prefix) throws BeansException {
return registerBeanDefinitions(map, prefix, "Map " + map);
}
/**
* Register bean definitions contained in a Map.
* Ignore ineligible properties.
*
* @param map a map of {@code name} to {@code property} (String or Object). Property
* values will be strings if coming from a Properties file etc. Property names
* (keys) must be Strings. Class keys must be Strings.
* @param prefix a filter within the keys in the map: e.g. 'beans.'
* (can be empty or {@code null})
* @param resourceDescription description of the resource that the
* Map came from (for logging purposes)
* @return the number of bean definitions found
* @throws BeansException in case of loading or parsing errors
* @see #registerBeanDefinitions(Map, String)
*/
public int registerBeanDefinitions(Map map, @Nullable String prefix, String resourceDescription)
throws BeansException {
if (prefix == null) {
prefix = "";
}
int beanCount = 0;
for (Object key : map.keySet()) {
if (!(key instanceof String keyString)) {
throw new IllegalArgumentException("Illegal key [" + key + "]: only Strings allowed");
}
if (keyString.startsWith(prefix)) {
// Key is of form: prefix.property
String nameAndProperty = keyString.substring(prefix.length());
// Find dot before property name, ignoring dots in property keys.
int sepIdx;
int propKeyIdx = nameAndProperty.indexOf(PropertyAccessor.PROPERTY_KEY_PREFIX);
if (propKeyIdx != -1) {
sepIdx = nameAndProperty.lastIndexOf(SEPARATOR, propKeyIdx);
}
else {
sepIdx = nameAndProperty.lastIndexOf(SEPARATOR);
}
if (sepIdx != -1) {
String beanName = nameAndProperty.substring(0, sepIdx);
if (logger.isTraceEnabled()) {
logger.trace("Found bean name '{}'", beanName);
}
if (!getRegistry().containsBeanDefinition(beanName)) {
// If we haven't already registered it...
registerBeanDefinition(beanName, map, prefix + beanName, resourceDescription);
++beanCount;
}
}
else {
// Ignore it: It wasn't a valid bean name and property,
// although it did start with the required prefix.
if (logger.isDebugEnabled()) {
logger.debug("Invalid bean name and property [{}]", nameAndProperty);
}
}
}
}
return beanCount;
}
/**
* Get all property values, given a prefix (which will be stripped)
* and add the bean they define to the factory with the given name.
*
* @param beanName name of the bean to define
* @param map a Map containing string pairs
* @param prefix prefix of each entry, which will be stripped
* @param resourceDescription description of the resource that the
* Map came from (for logging purposes)
* @throws BeansException if the bean definition could not be parsed or registered
*/
protected void registerBeanDefinition(String beanName, Map map, String prefix, String resourceDescription)
throws BeansException {
String className = null;
String parent = null;
String scope = BeanDefinition.SCOPE_SINGLETON;
boolean isAbstract = false;
boolean lazyInit = false;
ConstructorArgumentValues cas = new ConstructorArgumentValues();
PropertyValues pvs = new PropertyValues();
String prefixWithSep = prefix + SEPARATOR;
int beginIndex = prefixWithSep.length();
for (Map.Entry entry : map.entrySet()) {
String key = ((String) entry.getKey()).strip();
if (key.startsWith(prefixWithSep)) {
String property = key.substring(beginIndex);
if (CLASS_KEY.equals(property)) {
className = ((String) entry.getValue()).strip();
}
else if (PARENT_KEY.equals(property)) {
parent = ((String) entry.getValue()).strip();
}
else if (ABSTRACT_KEY.equals(property)) {
String val = ((String) entry.getValue()).strip();
isAbstract = TRUE_VALUE.equals(val);
}
else if (SCOPE_KEY.equals(property)) {
scope = ((String) entry.getValue()).strip();
}
else if (SINGLETON_KEY.equals(property)) {
// Infra 1.2 style
String val = ((String) entry.getValue()).strip();
scope = StringUtils.isEmpty(val) || TRUE_VALUE.equals(val) ?
BeanDefinition.SCOPE_SINGLETON : BeanDefinition.SCOPE_PROTOTYPE;
}
else if (LAZY_INIT_KEY.equals(property)) {
String val = ((String) entry.getValue()).strip();
lazyInit = TRUE_VALUE.equals(val);
}
else if (property.startsWith(CONSTRUCTOR_ARG_PREFIX)) {
if (property.endsWith(REF_SUFFIX)) {
int index = Integer.parseInt(property, 1, property.length() - REF_SUFFIX.length(), 10);
cas.addIndexedArgumentValue(index, new RuntimeBeanReference(entry.getValue().toString()));
}
else {
int index = Integer.parseInt(property, 1, property.length(), 10);
cas.addIndexedArgumentValue(index, readValue(entry));
}
}
else if (property.endsWith(REF_SUFFIX)) {
// This isn't a real property, but a reference to another prototype
// Extract property name: property is of form dog(ref)
property = property.substring(0, property.length() - REF_SUFFIX.length());
String ref = ((String) entry.getValue()).strip();
// It doesn't matter if the referenced bean hasn't yet been registered:
// this will ensure that the reference is resolved at runtime.
Object val = new RuntimeBeanReference(ref);
pvs.add(property, val);
}
else {
// It's a normal bean property.
pvs.add(property, readValue(entry));
}
}
}
if (logger.isTraceEnabled()) {
logger.trace("Registering bean definition for bean name '{}' with {}", beanName, pvs);
}
// Just use default parent if we're not dealing with the parent itself,
// and if there's no class name specified. The latter has to happen for
// backwards compatibility reasons.
if (parent == null && className == null && !beanName.equals(this.defaultParentBean)) {
parent = this.defaultParentBean;
}
try {
var bd = BeanDefinitionReaderUtils.createBeanDefinition(parent, className, getBeanClassLoader());
bd.setScope(scope);
bd.setAbstract(isAbstract);
bd.setLazyInit(lazyInit);
bd.setConstructorArgumentValues(cas);
bd.setPropertyValues(pvs);
getRegistry().registerBeanDefinition(beanName, bd);
}
catch (ClassNotFoundException ex) {
throw new BeanClassLoadFailedException(resourceDescription, beanName, className, ex);
}
catch (LinkageError err) {
throw new BeanClassLoadFailedException(resourceDescription, beanName, className, err);
}
}
/**
* Reads the value of the entry. Correctly interprets bean references for
* values that are prefixed with an asterisk.
*/
private Object readValue(Map.Entry entry) {
Object val = entry.getValue();
if (val instanceof String strVal) {
// If it starts with a reference prefix...
if (strVal.startsWith(REF_PREFIX)) {
// Expand the reference.
String targetName = strVal.substring(1);
if (targetName.startsWith(REF_PREFIX)) {
// Escaped prefix -> use plain value.
val = targetName;
}
else {
val = new RuntimeBeanReference(targetName);
}
}
}
return val;
}
}