org.apache.commons.digester.xmlrules.DigesterRuleParser Maven / Gradle / Ivy
/* $Id: DigesterRuleParser.java 729242 2008-12-24 06:10:07Z rahul $
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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.apache.commons.digester.xmlrules;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.Stack;
import java.util.StringTokenizer;
import org.apache.commons.beanutils.ConvertUtils;
import org.apache.commons.digester.AbstractObjectCreationFactory;
import org.apache.commons.digester.BeanPropertySetterRule;
import org.apache.commons.digester.CallMethodRule;
import org.apache.commons.digester.CallParamRule;
import org.apache.commons.digester.Digester;
import org.apache.commons.digester.FactoryCreateRule;
import org.apache.commons.digester.NodeCreateRule;
import org.apache.commons.digester.ObjectCreateRule;
import org.apache.commons.digester.ObjectParamRule;
import org.apache.commons.digester.Rule;
import org.apache.commons.digester.RuleSetBase;
import org.apache.commons.digester.Rules;
import org.apache.commons.digester.SetNestedPropertiesRule;
import org.apache.commons.digester.SetNextRule;
import org.apache.commons.digester.SetPropertiesRule;
import org.apache.commons.digester.SetPropertyRule;
import org.apache.commons.digester.SetRootRule;
import org.apache.commons.digester.SetTopRule;
import org.w3c.dom.Node;
import org.xml.sax.Attributes;
import org.xml.sax.SAXException;
/**
* This is a RuleSet that parses XML into Digester rules, and then
* adds those rules to a 'target' Digester.
*
* @since 1.2
*/
public class DigesterRuleParser extends RuleSetBase {
public static final String DIGESTER_PUBLIC_ID = "-//Jakarta Apache //DTD digester-rules XML V1.0//EN";
/**
* path to the DTD
*/
private String digesterDtdUrl;
/**
* This is the digester to which we are adding the rules that we parse
* from the Rules XML document.
*/
protected Digester targetDigester;
/** See {@link #setBasePath}. */
protected String basePath = "";
/**
* A stack whose toString method returns a '/'-separated concatenation
* of all the elements in the stack.
*/
protected class PatternStack extends Stack {
private static final long serialVersionUID = 1L;
public String toString() {
StringBuffer str = new StringBuffer();
for (int i = 0; i < size(); i++) {
String elem = get(i).toString();
if (elem.length() > 0) {
if (str.length() > 0) {
str.append('/');
}
str.append(elem);
}
}
return str.toString();
}
}
/**
* A stack used to maintain the current pattern. The Rules XML document
* type allows nesting of patterns. If an element defines a matching
* pattern, the resulting pattern is a concatenation of that pattern with
* all the ancestor elements' patterns. Hence the need for a stack.
*/
protected PatternStack patternStack;
/**
* Used to detect circular includes
*/
private Set includedFiles = new HashSet();
/**
* Constructs a DigesterRuleParser. This object will be inoperable
* until the target digester is set, via setTarget(Digester)
*/
public DigesterRuleParser() {
patternStack = new PatternStack();
}
/**
* Constructs a rule set for converting XML digester rule descriptions
* into Rule objects, and adding them to the given Digester
* @param targetDigester the Digester to add the rules to
*/
public DigesterRuleParser(Digester targetDigester) {
this.targetDigester = targetDigester;
patternStack = new PatternStack();
}
/**
* Constructs a rule set for parsing an XML digester rule file that
* has been included within an outer XML digester rule file. In this
* case, we must pass the pattern stack and the target digester
* to the rule set, as well as the list of files that have already
* been included, for cycle detection.
* @param targetDigester the Digester to add the rules to
* @param stack Stack containing the prefix pattern string to be prepended
* to any pattern parsed by this rule set.
*/
private DigesterRuleParser(Digester targetDigester,
PatternStack stack, Set includedFiles) {
this.targetDigester = targetDigester;
patternStack = stack;
this.includedFiles = includedFiles;
}
/**
* Sets the digester into which to add the parsed rules
* @param d the Digester to add the rules to
*/
public void setTarget(Digester d) {
targetDigester = d;
}
/**
* Set a base pattern beneath which all the rules loaded by this
* object will be registered. If this string is not empty, and does
* not end in a "/", then one will be added.
*
* @since 1.6
*/
public void setBasePath(String path) {
if (path == null) {
basePath = "";
}
else if ((path.length() > 0) && !path.endsWith("/")) {
basePath = path + "/";
} else {
basePath = path;
}
}
/**
* Sets the location of the digester rules DTD. This is the DTD used
* to validate the rules XML file.
*/
public void setDigesterRulesDTD(String dtdURL) {
digesterDtdUrl = dtdURL;
}
/**
* Returns the location of the DTD used to validate the digester rules
* XML document.
*/
protected String getDigesterRulesDTD() {
//ClassLoader classLoader = getClass().getClassLoader();
//URL url = classLoader.getResource(DIGESTER_DTD_PATH);
//return url.toString();
return digesterDtdUrl;
}
/**
* Adds a rule the the target digester. After a rule has been created by
* parsing the XML, it is added to the digester by calling this method.
* Typically, this method is called via reflection, when executing
* a SetNextRule, from the Digester that is parsing the rules XML.
* @param rule a Rule to add to the target digester.
*/
public void add(Rule rule) {
targetDigester.addRule(
basePath + patternStack.toString(), rule);
}
/**
* Add to the given digester the set of Rule instances used to parse an XML
* document defining Digester rules. When the digester parses an XML file,
* it will add the resulting rules & patterns to the 'target digester'
* that was passed in this RuleSet's constructor.
* If you extend this class to support additional rules, your implementation
* should of this method should call this implementation first: i.e.
* super.addRuleInstances(digester);
*/
public void addRuleInstances(Digester digester) {
final String ruleClassName = Rule.class.getName();
digester.register(DIGESTER_PUBLIC_ID, getDigesterRulesDTD());
digester.addRule("*/pattern", new PatternRule("value"));
digester.addRule("*/include", new IncludeRule());
digester.addFactoryCreate("*/bean-property-setter-rule", new BeanPropertySetterRuleFactory());
digester.addRule("*/bean-property-setter-rule", new PatternRule("pattern"));
digester.addSetNext("*/bean-property-setter-rule", "add", ruleClassName);
digester.addFactoryCreate("*/call-method-rule", new CallMethodRuleFactory());
digester.addRule("*/call-method-rule", new PatternRule("pattern"));
digester.addSetNext("*/call-method-rule", "add", ruleClassName);
digester.addFactoryCreate("*/object-param-rule", new ObjectParamRuleFactory());
digester.addRule("*/object-param-rule", new PatternRule("pattern"));
digester.addSetNext("*/object-param-rule", "add", ruleClassName);
digester.addFactoryCreate("*/call-param-rule", new CallParamRuleFactory());
digester.addRule("*/call-param-rule", new PatternRule("pattern"));
digester.addSetNext("*/call-param-rule", "add", ruleClassName);
digester.addFactoryCreate("*/factory-create-rule", new FactoryCreateRuleFactory());
digester.addRule("*/factory-create-rule", new PatternRule("pattern"));
digester.addSetNext("*/factory-create-rule", "add", ruleClassName);
digester.addFactoryCreate("*/object-create-rule", new ObjectCreateRuleFactory());
digester.addRule("*/object-create-rule", new PatternRule("pattern"));
digester.addSetNext("*/object-create-rule", "add", ruleClassName);
digester.addFactoryCreate("*/node-create-rule", new NodeCreateRuleFactory());
digester.addRule("*/node-create-rule", new PatternRule("pattern"));
digester.addSetNext("*/node-create-rule", "add", ruleClassName);
digester.addFactoryCreate("*/set-properties-rule", new SetPropertiesRuleFactory());
digester.addRule("*/set-properties-rule", new PatternRule("pattern"));
digester.addSetNext("*/set-properties-rule", "add", ruleClassName);
digester.addRule("*/set-properties-rule/alias", new SetPropertiesAliasRule());
digester.addFactoryCreate("*/set-property-rule", new SetPropertyRuleFactory());
digester.addRule("*/set-property-rule", new PatternRule("pattern"));
digester.addSetNext("*/set-property-rule", "add", ruleClassName);
digester.addFactoryCreate("*/set-nested-properties-rule", new SetNestedPropertiesRuleFactory());
digester.addRule("*/set-nested-properties-rule", new PatternRule("pattern"));
digester.addSetNext("*/set-nested-properties-rule", "add", ruleClassName);
digester.addRule("*/set-nested-properties-rule/alias", new SetNestedPropertiesAliasRule());
digester.addFactoryCreate("*/set-top-rule", new SetTopRuleFactory());
digester.addRule("*/set-top-rule", new PatternRule("pattern"));
digester.addSetNext("*/set-top-rule", "add", ruleClassName);
digester.addFactoryCreate("*/set-next-rule", new SetNextRuleFactory());
digester.addRule("*/set-next-rule", new PatternRule("pattern"));
digester.addSetNext("*/set-next-rule", "add", ruleClassName);
digester.addFactoryCreate("*/set-root-rule", new SetRootRuleFactory());
digester.addRule("*/set-root-rule", new PatternRule("pattern"));
digester.addSetNext("*/set-root-rule", "add", ruleClassName);
}
/**
* A rule for extracting the pattern matching strings from the rules XML.
* In the digester-rules document type, a pattern can either be declared
* in the 'value' attribute of a element (in which case the pattern
* applies to all rules elements contained within the element),
* or it can be declared in the optional 'pattern' attribute of a rule
* element.
*/
private class PatternRule extends Rule {
private String attrName;
private String pattern = null;
/**
* @param attrName The name of the attribute containing the pattern
*/
public PatternRule(String attrName) {
super();
this.attrName = attrName;
}
/**
* If a pattern is defined for the attribute, push it onto the
* pattern stack.
*/
public void begin(Attributes attributes) {
pattern = attributes.getValue(attrName);
if (pattern != null) {
patternStack.push(pattern);
}
}
/**
* If there was a pattern for this element, pop it off the pattern
* stack.
*/
public void end() {
if (pattern != null) {
patternStack.pop();
}
}
}
/**
* A rule for including one rules XML file within another. Included files
* behave as if they are 'macro-expanded' within the includer. This means
* that the values of the pattern stack are prefixed to every pattern
* in the included rules. This rule will detect 'circular' includes,
* which would result in infinite recursion. It throws a
* CircularIncludeException when a cycle is detected, which will terminate
* the parse.
*/
private class IncludeRule extends Rule {
public IncludeRule() {
super();
}
/**
* To include a rules xml file, we instantiate another Digester, and
* another DigesterRulesRuleSet. We pass the
* pattern stack and the target Digester to the new rule set, and
* tell the Digester to parse the file.
*/
public void begin(Attributes attributes) throws Exception {
// The path attribute gives the URI to another digester rules xml file
String fileName = attributes.getValue("path");
if (fileName != null && fileName.length() > 0) {
includeXMLRules(fileName);
}
// The class attribute gives the name of a class that implements
// the DigesterRulesSource interface
String className = attributes.getValue("class");
if (className != null && className.length() > 0) {
includeProgrammaticRules(className);
}
}
/**
* Creates another DigesterRuleParser, and uses it to extract the rules
* out of the give XML file. The contents of the current pattern stack
* will be prepended to all of the pattern strings parsed from the file.
*/
private void includeXMLRules(String fileName)
throws IOException, SAXException, CircularIncludeException {
ClassLoader cl = Thread.currentThread().getContextClassLoader();
if (cl == null) {
cl = DigesterRuleParser.this.getClass().getClassLoader();
}
URL fileURL = cl.getResource(fileName);
if (fileURL == null) {
throw new FileNotFoundException("File \"" + fileName + "\" not found.");
}
fileName = fileURL.toExternalForm();
if (includedFiles.add(fileName) == false) {
// circular include detected
throw new CircularIncludeException(fileName);
}
// parse the included xml file
DigesterRuleParser includedSet =
new DigesterRuleParser(targetDigester, patternStack, includedFiles);
includedSet.setDigesterRulesDTD(getDigesterRulesDTD());
Digester digester = new Digester();
digester.addRuleSet(includedSet);
digester.push(DigesterRuleParser.this);
digester.parse(fileName);
includedFiles.remove(fileName);
}
/**
* Creates an instance of the indicated class. The class must implement
* the DigesterRulesSource interface. Passes the target digester to
* that instance. The DigesterRulesSource instance is supposed to add
* rules into the digester. The contents of the current pattern stack
* will be automatically prepended to all of the pattern strings added
* by the DigesterRulesSource instance.
*/
private void includeProgrammaticRules(String className)
throws ClassNotFoundException, ClassCastException,
InstantiationException, IllegalAccessException {
Class cls = Class.forName(className);
DigesterRulesSource rulesSource = (DigesterRulesSource) cls.newInstance();
// wrap the digester's Rules object, to prepend pattern
Rules digesterRules = targetDigester.getRules();
Rules prefixWrapper =
new RulesPrefixAdapter(patternStack.toString(), digesterRules);
targetDigester.setRules(prefixWrapper);
try {
rulesSource.getRules(targetDigester);
} finally {
// Put the unwrapped rules back
targetDigester.setRules(digesterRules);
}
}
}
/**
* Wraps a Rules object. Delegates all the Rules interface methods
* to the underlying Rules object. Overrides the add method to prepend
* a prefix to the pattern string.
*/
private class RulesPrefixAdapter implements Rules {
private Rules delegate;
private String prefix;
/**
* @param patternPrefix the pattern string to prepend to the pattern
* passed to the add method.
* @param rules The wrapped Rules object. All of this class's methods
* pass through to this object.
*/
public RulesPrefixAdapter(String patternPrefix, Rules rules) {
prefix = patternPrefix;
delegate = rules;
}
/**
* Register a new Rule instance matching a pattern which is constructed
* by concatenating the pattern prefix with the given pattern.
*/
public void add(String pattern, Rule rule) {
StringBuffer buffer = new StringBuffer();
buffer.append(prefix);
if (!pattern.startsWith("/")) {
buffer.append('/');
}
buffer.append(pattern);
delegate.add(buffer.toString(), rule);
}
/**
* This method passes through to the underlying Rules object.
*/
public void clear() {
delegate.clear();
}
/**
* This method passes through to the underlying Rules object.
*/
public Digester getDigester() {
return delegate.getDigester();
}
/**
* This method passes through to the underlying Rules object.
*/
public String getNamespaceURI() {
return delegate.getNamespaceURI();
}
/**
* @deprecated Call match(namespaceURI,pattern) instead.
*/
public List match(String pattern) {
return delegate.match(pattern);
}
/**
* This method passes through to the underlying Rules object.
*/
public List match(String namespaceURI, String pattern) {
return delegate.match(namespaceURI, pattern);
}
/**
* This method passes through to the underlying Rules object.
*/
public List rules() {
return delegate.rules();
}
/**
* This method passes through to the underlying Rules object.
*/
public void setDigester(Digester digester) {
delegate.setDigester(digester);
}
/**
* This method passes through to the underlying Rules object.
*/
public void setNamespaceURI(String namespaceURI) {
delegate.setNamespaceURI(namespaceURI);
}
}
///////////////////////////////////////////////////////////////////////
// Classes beyond this point are ObjectCreationFactory implementations,
// used to create Rule objects and initialize them from SAX attributes.
///////////////////////////////////////////////////////////////////////
/**
* Factory for creating a BeanPropertySetterRule.
*/
private class BeanPropertySetterRuleFactory extends AbstractObjectCreationFactory {
public Object createObject(Attributes attributes) throws Exception {
Rule beanPropertySetterRule = null;
String propertyname = attributes.getValue("propertyname");
if (propertyname == null) {
// call the setter method corresponding to the element name.
beanPropertySetterRule = new BeanPropertySetterRule();
} else {
beanPropertySetterRule = new BeanPropertySetterRule(propertyname);
}
return beanPropertySetterRule;
}
}
/**
* Factory for creating a CallMethodRule.
*/
protected class CallMethodRuleFactory extends AbstractObjectCreationFactory {
public Object createObject(Attributes attributes) {
Rule callMethodRule = null;
String methodName = attributes.getValue("methodname");
// Select which element is to be the target. Default to zero,
// ie the top object on the stack.
int targetOffset = 0;
String targetOffsetStr = attributes.getValue("targetoffset");
if (targetOffsetStr != null) {
targetOffset = Integer.parseInt(targetOffsetStr);
}
if (attributes.getValue("paramcount") == null) {
// call against empty method
callMethodRule = new CallMethodRule(targetOffset, methodName);
} else {
int paramCount = Integer.parseInt(attributes.getValue("paramcount"));
String paramTypesAttr = attributes.getValue("paramtypes");
if (paramTypesAttr == null || paramTypesAttr.length() == 0) {
callMethodRule = new CallMethodRule(targetOffset, methodName, paramCount);
} else {
String[] paramTypes = getParamTypes(paramTypesAttr);
callMethodRule = new CallMethodRule(
targetOffset, methodName, paramCount, paramTypes);
}
}
return callMethodRule;
}
/**
* Process the comma separated list of paramTypes
* into an array of String class names
*/
private String[] getParamTypes(String paramTypes) {
String[] paramTypesArray;
if( paramTypes != null ) {
ArrayList paramTypesList = new ArrayList();
StringTokenizer tokens = new StringTokenizer(
paramTypes, " \t\n\r,");
while (tokens.hasMoreTokens()) {
paramTypesList.add(tokens.nextToken());
}
paramTypesArray = (String[])paramTypesList.toArray(new String[0]);
} else {
paramTypesArray = new String[0];
}
return paramTypesArray;
}
}
/**
* Factory for creating a CallParamRule.
*/
protected class CallParamRuleFactory extends AbstractObjectCreationFactory {
public Object createObject(Attributes attributes) {
// create callparamrule
int paramIndex = Integer.parseInt(attributes.getValue("paramnumber"));
String attributeName = attributes.getValue("attrname");
String fromStack = attributes.getValue("from-stack");
String stackIndex = attributes.getValue("stack-index");
Rule callParamRule = null;
if (attributeName == null) {
if (stackIndex != null) {
callParamRule = new CallParamRule(
paramIndex, Integer.parseInt(stackIndex));
} else if (fromStack != null) {
callParamRule = new CallParamRule(
paramIndex, Boolean.valueOf(fromStack).booleanValue());
} else {
callParamRule = new CallParamRule(paramIndex);
}
} else {
if (fromStack == null) {
callParamRule = new CallParamRule(paramIndex, attributeName);
} else {
// specifying both from-stack and attribute name is not allowed
throw new RuntimeException(
"Attributes from-stack and attrname cannot both be present.");
}
}
return callParamRule;
}
}
/**
* Factory for creating a ObjectParamRule
*/
protected class ObjectParamRuleFactory extends AbstractObjectCreationFactory {
public Object createObject(Attributes attributes) throws Exception {
// create callparamrule
int paramIndex = Integer.parseInt(attributes.getValue("paramnumber"));
String attributeName = attributes.getValue("attrname");
String type = attributes.getValue("type");
String value = attributes.getValue("value");
Rule objectParamRule = null;
// type name is requried
if (type == null) {
throw new RuntimeException("Attribute 'type' is required.");
}
// create object instance
Object param = null;
Class clazz = Class.forName(type);
if (value == null) {
param = clazz.newInstance();
} else {
param = ConvertUtils.convert(value, clazz);
}
if (attributeName == null) {
objectParamRule = new ObjectParamRule(paramIndex, param);
} else {
objectParamRule = new ObjectParamRule(paramIndex, attributeName, param);
}
return objectParamRule;
}
}
/**
* Factory for creating a NodeCreateRule
*/
protected class NodeCreateRuleFactory extends AbstractObjectCreationFactory {
public Object createObject(Attributes attributes) throws Exception {
String nodeType = attributes.getValue("type");
if (nodeType == null || "".equals(nodeType)) {
// uses Node.ELEMENT_NODE
return new NodeCreateRule();
} else if ("element".equals(nodeType)) {
return new NodeCreateRule(Node.ELEMENT_NODE);
} else if ("fragment".equals(nodeType)) {
return new NodeCreateRule(Node.DOCUMENT_FRAGMENT_NODE);
} else {
throw new RuntimeException(
"Unrecognized node type: "
+ nodeType
+ ". This attribute is optional or can have a value of element|fragment.");
}
}
}
/**
* Factory for creating a FactoryCreateRule
*/
protected class FactoryCreateRuleFactory extends AbstractObjectCreationFactory {
public Object createObject(Attributes attributes) {
String className = attributes.getValue("classname");
String attrName = attributes.getValue("attrname");
boolean ignoreExceptions =
"true".equalsIgnoreCase(attributes.getValue("ignore-exceptions"));
return (attrName == null || attrName.length() == 0) ?
new FactoryCreateRule( className, ignoreExceptions) :
new FactoryCreateRule( className, attrName, ignoreExceptions);
}
}
/**
* Factory for creating a ObjectCreateRule
*/
protected class ObjectCreateRuleFactory extends AbstractObjectCreationFactory {
public Object createObject(Attributes attributes) {
String className = attributes.getValue("classname");
String attrName = attributes.getValue("attrname");
return (attrName == null || attrName.length() == 0) ?
new ObjectCreateRule( className) :
new ObjectCreateRule( className, attrName);
}
}
/**
* Factory for creating a SetPropertiesRule
*/
protected class SetPropertiesRuleFactory extends AbstractObjectCreationFactory {
public Object createObject(Attributes attributes) {
return new SetPropertiesRule();
}
}
/**
* Factory for creating a SetPropertyRule
*/
protected class SetPropertyRuleFactory extends AbstractObjectCreationFactory {
public Object createObject(Attributes attributes) {
String name = attributes.getValue("name");
String value = attributes.getValue("value");
return new SetPropertyRule( name, value);
}
}
/**
* Factory for creating a SetNestedPropertiesRule
*/
protected class SetNestedPropertiesRuleFactory extends AbstractObjectCreationFactory {
public Object createObject(Attributes attributes) {
boolean allowUnknownChildElements =
"true".equalsIgnoreCase(attributes.getValue("allow-unknown-child-elements"));
SetNestedPropertiesRule snpr = new SetNestedPropertiesRule();
snpr.setAllowUnknownChildElements( allowUnknownChildElements );
return snpr;
}
}
/**
* Factory for creating a SetTopRuleFactory
*/
protected class SetTopRuleFactory extends AbstractObjectCreationFactory {
public Object createObject(Attributes attributes) {
String methodName = attributes.getValue("methodname");
String paramType = attributes.getValue("paramtype");
return (paramType == null || paramType.length() == 0) ?
new SetTopRule( methodName) :
new SetTopRule( methodName, paramType);
}
}
/**
* Factory for creating a SetNextRuleFactory
*/
protected class SetNextRuleFactory extends AbstractObjectCreationFactory {
public Object createObject(Attributes attributes) {
String methodName = attributes.getValue("methodname");
String paramType = attributes.getValue("paramtype");
return (paramType == null || paramType.length() == 0) ?
new SetNextRule( methodName) :
new SetNextRule( methodName, paramType);
}
}
/**
* Factory for creating a SetRootRuleFactory
*/
protected class SetRootRuleFactory extends AbstractObjectCreationFactory {
public Object createObject(Attributes attributes) {
String methodName = attributes.getValue("methodname");
String paramType = attributes.getValue("paramtype");
return (paramType == null || paramType.length() == 0) ?
new SetRootRule( methodName) :
new SetRootRule( methodName, paramType);
}
}
/**
* A rule for adding a attribute-property alias to the custom alias mappings of
* the containing SetPropertiesRule rule.
*/
protected class SetPropertiesAliasRule extends Rule {
/**
* Base constructor.
*/
public SetPropertiesAliasRule() {
super();
}
/**
* Add the alias to the SetPropertiesRule object created by the
* enclosing tag.
*/
public void begin(Attributes attributes) {
String attrName = attributes.getValue("attr-name");
String propName = attributes.getValue("prop-name");
SetPropertiesRule rule = (SetPropertiesRule) digester.peek();
rule.addAlias(attrName, propName);
}
}
/**
* A rule for adding a attribute-property alias to the custom alias mappings of
* the containing SetNestedPropertiesRule rule.
*/
protected class SetNestedPropertiesAliasRule extends Rule {
/**
* Base constructor.
*/
public SetNestedPropertiesAliasRule() {
super();
}
/**
* Add the alias to the SetNestedPropertiesRule object created by the
* enclosing tag.
*/
public void begin(Attributes attributes) {
String attrName = attributes.getValue("attr-name");
String propName = attributes.getValue("prop-name");
SetNestedPropertiesRule rule = (SetNestedPropertiesRule) digester.peek();
rule.addAlias(attrName, propName);
}
}
}