/*
* Copyright 2002-2008 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
*
* 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 org.springframework.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 org.springframework.beans.BeansException;
import org.springframework.beans.MutablePropertyValues;
import org.springframework.beans.PropertyAccessor;
import org.springframework.beans.factory.BeanDefinitionStoreException;
import org.springframework.beans.factory.CannotLoadBeanClassException;
import org.springframework.beans.factory.config.ConstructorArgumentValues;
import org.springframework.beans.factory.config.RuntimeBeanReference;
import org.springframework.core.io.Resource;
import org.springframework.core.io.support.EncodedResource;
import org.springframework.util.DefaultPropertiesPersister;
import org.springframework.util.PropertiesPersister;
import org.springframework.util.StringUtils;
/**
* Bean definition reader for a simple properties format.
*
* <p>Provides bean definition registration methods for Map/Properties and
* ResourceBundle. Typically applied to a DefaultListableBeanFactory.
*
* <p><b>Example:</b>
*
* <pre class="code">
* 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.$1=1000000 // inject value '1000000' at 1st constructor arg
* </pre>
*
* @author Rod Johnson
* @author Juergen Hoeller
* @author Rob Harrop
* @since 26.11.2003
* @see DefaultListableBeanFactory
*/
public class PropertiesBeanDefinitionReader extends AbstractBeanDefinitionReader {
/**
* Value of a T/F attribute that represents true.
* Anything else represents false. Case seNsItive.
*/
public static final String TRUE_VALUE = "true";
/**
* Separator between bean name and property name.
* We follow normal Java conventions.
*/
public static final String SEPARATOR = ".";
/**
* Special key to distinguish <code>owner.(class)=com.myapp.MyClass</code>-
*/
public static final String CLASS_KEY = "(class)";
/**
* Special key to distinguish <code>owner.(parent)=parentBeanName</code>.
*/
public static final String PARENT_KEY = "(parent)";
/**
* Special key to distinguish <code>owner.(scope)=prototype</code>.
* Default is "true".
*/
public static final String SCOPE_KEY = "(scope)";
/**
* Special key to distinguish <code>owner.(singleton)=false</code>.
* Default is "true".
*/
public static final String SINGLETON_KEY = "(singleton)";
/**
* Special key to distinguish <code>owner.(abstract)=true</code>
* Default is "false".
*/
public static final String ABSTRACT_KEY = "(abstract)";
/**
* Special key to distinguish <code>owner.(lazy-init)=true</code>
* Default is "false".
*/
public static final String LAZY_INIT_KEY = "(lazy-init)";
/**
* Property suffix for references to other beans in the current
* BeanFactory: e.g. <code>owner.dog(ref)=fido</code>.
* Whether this is a reference to a singleton or a prototype
* will depend on the definition of the target bean.
*/
public static final String REF_SUFFIX = "(ref)";
/**
* Prefix before values referencing other beans.
*/
public static final String REF_PREFIX = "*";
/**
* Prefix used to denote a constructor argument definition.
*/
public static final String CONSTRUCTOR_ARG_PREFIX = "$";
private String defaultParentBean;
private PropertiesPersister propertiesPersister = new DefaultPropertiesPersister();
/**
* 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.
* <p>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.
* <p>Strictly speaking, the rule that a default parent setting does
* not apply to a bean definition that carries a class is there for
* backwards compatiblity reasons. It still matches the typical use case.
*/
public void setDefaultParentBean(String defaultParentBean) {
this.defaultParentBean = defaultParentBean;
}
/**
* Return the default parent bean for this bean factory.
*/
public String getDefaultParentBean() {
return this.defaultParentBean;
}
/**
* Set the PropertiesPersister to use for parsing properties files.
* The default is DefaultPropertiesPersister.
* @see org.springframework.util.DefaultPropertiesPersister
*/
public void setPropertiesPersister(PropertiesPersister propertiesPersister) {
this.propertiesPersister =
(propertiesPersister != null ? propertiesPersister : new DefaultPropertiesPersister());
}
/**
* 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(org.springframework.core.io.Resource, String)
*/
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</code>)
* @return the number of bean definitions found
* @throws BeanDefinitionStoreException in case of loading or parsing errors
*/
public int loadBeanDefinitions(Resource resource, 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</code>)
* @return the number of bean definitions found
* @throws BeanDefinitionStoreException in case of loading or parsing errors
*/
public int loadBeanDefinitions(EncodedResource encodedResource, String prefix)
throws BeanDefinitionStoreException {
Properties props = new Properties();
try {
InputStream is = encodedResource.getResource().getInputStream();
try {
if (encodedResource.getEncoding() != null) {
getPropertiesPersister().load(props, new InputStreamReader(is, encodedResource.getEncoding()));
}
else {
getPropertiesPersister().load(props, is);
}
}
finally {
is.close();
}
return registerBeanDefinitions(props, prefix, encodedResource.getResource().getDescription());
}
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.
* <p>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</code>)
* @return the number of bean definitions found
* @throws BeanDefinitionStoreException in case of loading or parsing errors
*/
public int registerBeanDefinitions(ResourceBundle rb, String prefix) throws BeanDefinitionStoreException {
// Simply create a map and call overloaded method.
Map<String, Object> map = new HashMap<String, Object>();
Enumeration keys = rb.getKeys();
while (keys.hasMoreElements()) {
String key = (String) 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 Map: name -> property (String or Object). Property values
* will be strings if coming from a Properties file etc. Property names
* (keys) <b>must</b> 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 Map name -> property (String or Object). Property values
* will be strings if coming from a Properties file etc. Property names
* (keys) <b>must</b> 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</code>)
* @return the number of bean definitions found
* @throws BeansException in case of loading or parsing errors
*/
public int registerBeanDefinitions(Map map, String prefix) throws BeansException {
return registerBeanDefinitions(map, prefix, "Map " + map);
}
/**
* Register bean definitions contained in a Map.
* Ignore ineligible properties.
* @param map Map name -> property (String or Object). Property values
* will be strings if coming from a Properties file etc. Property names
* (keys) <b>must</b> 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</code>)
* @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, String prefix, String resourceDescription)
throws BeansException {
if (prefix == null) {
prefix = "";
}
int beanCount = 0;
for (Object key : map.keySet()) {
if (!(key instanceof String)) {
throw new IllegalArgumentException("Illegal key [" + key + "]: only Strings allowed");
}
String keyString = (String) key;
if (keyString.startsWith(prefix)) {
// Key is of form: prefix<name>.property
String nameAndProperty = keyString.substring(prefix.length());
// Find dot before property name, ignoring dots in property keys.
int sepIdx = -1;
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.isDebugEnabled()) {
logger.debug("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 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 = GenericBeanDefinition.SCOPE_SINGLETON;
boolean isAbstract = false;
boolean lazyInit = false;
ConstructorArgumentValues cas = new ConstructorArgumentValues();
MutablePropertyValues pvs = new MutablePropertyValues();
for (Map.Entry entry : map.entrySet()) {
String key = StringUtils.trimWhitespace((String) entry.getKey());
if (key.startsWith(prefix + SEPARATOR)) {
String property = key.substring(prefix.length() + SEPARATOR.length());
if (CLASS_KEY.equals(property)) {
className = StringUtils.trimWhitespace((String) entry.getValue());
}
else if (PARENT_KEY.equals(property)) {
parent = StringUtils.trimWhitespace((String) entry.getValue());
}
else if (ABSTRACT_KEY.equals(property)) {
String val = StringUtils.trimWhitespace((String) entry.getValue());
isAbstract = TRUE_VALUE.equals(val);
}
else if (SCOPE_KEY.equals(property)) {
// Spring 2.0 style
scope = StringUtils.trimWhitespace((String) entry.getValue());
}
else if (SINGLETON_KEY.equals(property)) {
// Spring 1.2 style
String val = StringUtils.trimWhitespace((String) entry.getValue());
scope = ((val == null || TRUE_VALUE.equals(val) ? GenericBeanDefinition.SCOPE_SINGLETON :
GenericBeanDefinition.SCOPE_PROTOTYPE));
}
else if (LAZY_INIT_KEY.equals(property)) {
String val = StringUtils.trimWhitespace((String) entry.getValue());
lazyInit = TRUE_VALUE.equals(val);
}
else if (property.startsWith(CONSTRUCTOR_ARG_PREFIX)) {
if (property.endsWith(REF_SUFFIX)) {
int index = Integer.parseInt(property.substring(1, property.length() - REF_SUFFIX.length()));
cas.addIndexedArgumentValue(index, new RuntimeBeanReference(entry.getValue().toString()));
}
else {
int index = Integer.parseInt(property.substring(1));
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 = StringUtils.trimWhitespace((String) entry.getValue());
// 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.isDebugEnabled()) {
logger.debug("Registering bean definition for bean name '" + beanName + "' with " + 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 {
AbstractBeanDefinition 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 CannotLoadBeanClassException(resourceDescription, beanName, className, ex);
}
catch (LinkageError err) {
throw new CannotLoadBeanClassException(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) {
String strVal = (String) val;
// 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;
}
}
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