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xieyinlu
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java/org/apache/tomcat/util/digester/RulesBase.java Normal file
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/*
* 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.tomcat.util.digester;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
/**
* <p>Default implementation of the <code>Rules</code> interface that supports
* the standard rule matching behavior. This class can also be used as a
* base class for specialized <code>Rules</code> implementations.</p>
*
* <p>The matching policies implemented by this class support two different
* types of pattern matching rules:</p>
* <ul>
* <li><em>Exact Match</em> - A pattern "a/b/c" exactly matches a
* <code>&lt;c&gt;</code> element, nested inside a <code>&lt;b&gt;</code>
* element, which is nested inside an <code>&lt;a&gt;</code> element.</li>
* <li><em>Tail Match</em> - A pattern "&#42;/a/b" matches a
* <code>&lt;b&gt;</code> element, nested inside an <code>&lt;a&gt;</code>
* element, no matter how deeply the pair is nested.</li>
* </ul>
*/
public class RulesBase implements Rules {
// ----------------------------------------------------- Instance Variables
/**
* The set of registered Rule instances, keyed by the matching pattern.
* Each value is a List containing the Rules for that pattern, in the
* order that they were originally registered.
*/
protected HashMap<String,List<Rule>> cache = new HashMap<>();
/**
* The Digester instance with which this Rules instance is associated.
*/
protected Digester digester = null;
/**
* The namespace URI for which subsequently added <code>Rule</code>
* objects are relevant, or <code>null</code> for matching independent
* of namespaces.
*
* @deprecated Unused. Will be removed in Tomcat 9.0.x
*/
@Deprecated
protected String namespaceURI = null;
/**
* The set of registered Rule instances, in the order that they were
* originally registered.
*/
protected ArrayList<Rule> rules = new ArrayList<>();
// ------------------------------------------------------------- Properties
/**
* Return the Digester instance with which this Rules instance is
* associated.
*/
@Override
public Digester getDigester() {
return this.digester;
}
/**
* Set the Digester instance with which this Rules instance is associated.
*
* @param digester The newly associated Digester instance
*/
@Override
public void setDigester(Digester digester) {
this.digester = digester;
for (Rule item : rules) {
item.setDigester(digester);
}
}
/**
* Return the namespace URI that will be applied to all subsequently
* added <code>Rule</code> objects.
*/
@Override
public String getNamespaceURI() {
return this.namespaceURI;
}
/**
* Set the namespace URI that will be applied to all subsequently
* added <code>Rule</code> objects.
*
* @param namespaceURI Namespace URI that must match on all
* subsequently added rules, or <code>null</code> for matching
* regardless of the current namespace URI
*/
@Override
public void setNamespaceURI(String namespaceURI) {
this.namespaceURI = namespaceURI;
}
// --------------------------------------------------------- Public Methods
/**
* Register a new Rule instance matching the specified pattern.
*
* @param pattern Nesting pattern to be matched for this Rule
* @param rule Rule instance to be registered
*/
@Override
public void add(String pattern, Rule rule) {
// to help users who accidentally add '/' to the end of their patterns
int patternLength = pattern.length();
if (patternLength>1 && pattern.endsWith("/")) {
pattern = pattern.substring(0, patternLength-1);
}
List<Rule> list = cache.get(pattern);
if (list == null) {
list = new ArrayList<>();
cache.put(pattern, list);
}
list.add(rule);
rules.add(rule);
if (this.digester != null) {
rule.setDigester(this.digester);
}
if (this.namespaceURI != null) {
rule.setNamespaceURI(this.namespaceURI);
}
}
/**
* Clear all existing Rule instance registrations.
*/
@Override
public void clear() {
cache.clear();
rules.clear();
}
/**
* Return a List of all registered Rule instances that match the specified
* nesting pattern, or a zero-length List if there are no matches. If more
* than one Rule instance matches, they <strong>must</strong> be returned
* in the order originally registered through the <code>add()</code>
* method.
*
* @param namespaceURI Namespace URI for which to select matching rules,
* or <code>null</code> to match regardless of namespace URI
* @param pattern Nesting pattern to be matched
*/
@Override
public List<Rule> match(String namespaceURI, String pattern) {
// List rulesList = (List) this.cache.get(pattern);
List<Rule> rulesList = lookup(namespaceURI, pattern);
if ((rulesList == null) || (rulesList.size() < 1)) {
// Find the longest key, ie more discriminant
String longKey = "";
for (String key : this.cache.keySet()) {
if (key.startsWith("*/")) {
if (pattern.equals(key.substring(2)) ||
pattern.endsWith(key.substring(1))) {
if (key.length() > longKey.length()) {
// rulesList = (List) this.cache.get(key);
rulesList = lookup(namespaceURI, key);
longKey = key;
}
}
}
}
}
if (rulesList == null) {
rulesList = new ArrayList<>();
}
return rulesList;
}
/**
* Return a List of all registered Rule instances, or a zero-length List
* if there are no registered Rule instances. If more than one Rule
* instance has been registered, they <strong>must</strong> be returned
* in the order originally registered through the <code>add()</code>
* method.
*/
@Override
public List<Rule> rules() {
return this.rules;
}
// ------------------------------------------------------ Protected Methods
/**
* Return a List of Rule instances for the specified pattern that also
* match the specified namespace URI (if any). If there are no such
* rules, return <code>null</code>.
*
* @param namespaceURI Namespace URI to match, or <code>null</code> to
* select matching rules regardless of namespace URI
* @param pattern Pattern to be matched
* @return a rules list
*/
protected List<Rule> lookup(String namespaceURI, String pattern) {
// Optimize when no namespace URI is specified
List<Rule> list = this.cache.get(pattern);
if (list == null) {
return null;
}
if ((namespaceURI == null) || (namespaceURI.length() == 0)) {
return list;
}
// Select only Rules that match on the specified namespace URI
ArrayList<Rule> results = new ArrayList<>();
for (Rule item : list) {
if ((namespaceURI.equals(item.getNamespaceURI())) ||
(item.getNamespaceURI() == null)) {
results.add(item);
}
}
return results;
}
}