Quelle RulesBase.java Sprache: JAVA

/*
* 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;

/**
* 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.
*
* The matching policies implemented by this class support two different
* types of pattern matching rules:
* <ul>
* <li>Exact Match - A pattern "a/b/c" exactly matches a
* <code><c></code> element, nested inside a <code></code>
* element, which is nested inside an <code><a></code> element.</li>
* <li>Tail Match - A pattern "*/a/b" matches a
* <code></code> element, nested inside an <code><a></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 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);
 }
 }

 // --------------------------------------------------------- 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);
 }

 cache.computeIfAbsent(pattern, k -> new ArrayList<>()).add(rule);
 rules.add(rule);
 if (this.digester != null) {
 rule.setDigester(this.digester);
 }
 }

 /**
 * 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 must 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 must 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
 List<Rule> results = new ArrayList<>();
 for (Rule item : list) {
 if ((namespaceURI.equals(item.getNamespaceURI())) ||
 (item.getNamespaceURI() == null)) {
 results.add(item);
 }
 }
 return results;
 }
}

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