| /* |
| * 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.netbeans.editor; |
| |
| import java.util.HashMap; |
| |
| /** |
| * Immutable and 'interned' wrapper holding |
| * an array of the contexts starting |
| * with the original context in which the token is defined |
| * and ending with the target context from which the token |
| * is being returned. |
| * It is final and has no public constructor. |
| * The only entrypoint is through the <tt>get()</tt> method. |
| * It's guaranteed that the two context-paths containing |
| * the same contexts in the same order are the same objects |
| * and the equal-operator can be used instead of calling <tt>equals()</tt>. |
| * |
| * @author Miloslav Metelka |
| * @version 1.00 |
| */ |
| |
| public final class TokenContextPath { |
| |
| /** Cache containing [ArrayMatcher, TokenContextPath] pairs. */ |
| private static final HashMap registry = new HashMap(199); |
| |
| /** Contexts contained in this context-path. */ |
| private final TokenContext[] contexts; |
| |
| /** Path for context-array without the last member. */ |
| private TokenContextPath parent; |
| |
| /** Path corresponding to the first context in the context-array. */ |
| private TokenContextPath base; |
| |
| /** Full name-prefix consisting of the prefixes |
| * of all the contexts in the path. |
| */ |
| private String namePrefix; |
| |
| /** Map holding [token-name, prefixed-token-name] pairs. */ |
| private final HashMap tokenNameCache = new HashMap(); |
| |
| /** Map holding [start-path-replacement, replaced-path] */ |
| private final HashMap replaceStartCache = new HashMap(); |
| |
| /** Get the context-path for non-empty array of the contexts. */ |
| static synchronized TokenContextPath get(TokenContext[] contexts) { |
| if (contexts == null || contexts.length == 0) { |
| throw new IllegalArgumentException("Contexts must be valid and non-empty."); // NOI18N |
| } |
| |
| ArrayMatcher am = new ArrayMatcher(contexts); |
| TokenContextPath path = (TokenContextPath)registry.get(am); |
| if (path == null) { |
| path = new TokenContextPath(contexts); |
| registry.put(am, path); |
| } |
| |
| return path; |
| } |
| |
| /** Construction from outside prohibited. */ |
| private TokenContextPath(TokenContext[] contexts) { |
| this.contexts = contexts; |
| |
| if (contexts.length == 1) { |
| base = this; // it's base for itself |
| } |
| } |
| |
| /** Retrieve the contexts of this context-path. The contexts |
| * of the context-array must NOT be modified in any way. |
| */ |
| public TokenContext[] getContexts() { |
| return contexts; |
| } |
| |
| /** Get the length of the path returning the length of the contexts array. */ |
| public int length() { |
| return contexts.length; |
| } |
| |
| /** Get parent context-path that consists of all the contexts |
| * of this path except the last one. |
| */ |
| public TokenContextPath getParent() { |
| if (parent == null && contexts.length > 1) { |
| TokenContext[] parentContexts = new TokenContext[contexts.length - 1]; |
| System.arraycopy(contexts, 0, parentContexts, 0, contexts.length - 1); |
| |
| parent = get(parentContexts); |
| } |
| |
| return parent; |
| } |
| |
| /** Get the base path which corresponds to only the first context |
| * in the context-array. The base path can be used for fast checking |
| * of the origin path of the token. |
| */ |
| public TokenContextPath getBase() { |
| if (base == null) { |
| base = getParent().getBase(); |
| } |
| |
| return base; |
| } |
| |
| /** Does this path contain the given path. It corresponds |
| * to the situation when the contexts of the given path |
| * are at the begining of this path. |
| */ |
| public boolean contains(TokenContextPath tcp) { |
| if (tcp == this) { |
| return true; |
| |
| } else if (contexts.length > 1) { |
| return getParent().contains(tcp); |
| |
| } else { |
| return false; |
| } |
| } |
| |
| /** Get the path which has the initial part of the path |
| * (usually only the base path) replaced by the given path. The length |
| * of the replaced part of the path is the same as the length |
| * of the path that will replace it. |
| * For better performance the method caches the [byPath, result-path] |
| * in hashmap. |
| * @param byPath path that will replace the initial portion |
| * of this path. The length of the portion is the same as the length |
| * of this parameter. |
| * @return the path with the initial part being replaced. |
| */ |
| public TokenContextPath replaceStart(TokenContextPath byPath) { |
| // Check whether byPath isn't longer than this path |
| if (contexts.length < byPath.contexts.length) { |
| throw new IllegalArgumentException("byPath=" + byPath + " is too long."); // NOI18N |
| } |
| |
| synchronized (replaceStartCache) { |
| TokenContextPath ret = (TokenContextPath)replaceStartCache.get(byPath); |
| if (ret == null) { |
| TokenContext[] targetContexts = (TokenContext[])contexts.clone(); |
| for (int i = byPath.contexts.length - 1; i >= 0; i--) { |
| targetContexts[i] = byPath.contexts[i]; |
| } |
| ret = get(targetContexts); |
| replaceStartCache.put(byPath, ret); |
| } |
| |
| return ret; |
| } |
| } |
| |
| /** Get the prefix that this context adds to the name of its tokens. */ |
| public String getNamePrefix() { |
| if (namePrefix == null) { |
| if (contexts.length == 1) { |
| namePrefix = contexts[0].getNamePrefix(); |
| |
| } else { // path has more contexts |
| namePrefix = (contexts[contexts.length - 1].getNamePrefix() |
| + getParent().getNamePrefix()).intern(); |
| } |
| } |
| |
| return namePrefix; |
| } |
| |
| /** Get the token-name with the name-prefix of this context-path. |
| * It merges the token-name with the name-prefix of this context-path |
| * but it does it without creating a new object. |
| */ |
| public String getFullTokenName(TokenCategory tokenIDOrCategory) { |
| String tokenName = tokenIDOrCategory.getName(); |
| String fullName; |
| synchronized (tokenNameCache) { |
| fullName = (String)tokenNameCache.get(tokenName); |
| if (fullName == null) { |
| fullName = (getNamePrefix() + tokenName).intern(); |
| tokenNameCache.put(tokenName, fullName); |
| } |
| } |
| |
| return fullName; |
| } |
| |
| public String toString() { |
| StringBuffer sb = new StringBuffer("|"); // NOI18N |
| for (int i = 0; i < contexts.length; i++) { |
| String shortName = contexts[i].getClass().getName(); |
| shortName = shortName.substring(shortName.lastIndexOf('.') + 1); |
| |
| sb.append('<'); |
| sb.append(shortName); |
| sb.append('>'); |
| } |
| sb.append('|'); |
| |
| return sb.toString(); |
| } |
| |
| private static final class ArrayMatcher { |
| |
| /** Cached hash-code */ |
| private int hash; |
| |
| private TokenContext[] contexts; |
| |
| ArrayMatcher(TokenContext[] contexts) { |
| this.contexts = contexts; |
| } |
| |
| public int hashCode() { |
| int h = hash; |
| if (h == 0) { |
| for (int i = contexts.length - 1; i >= 0; i--) { |
| h = h * 31 + contexts[i].hashCode(); // !!! |
| } |
| hash = h; |
| } |
| |
| return h; |
| } |
| |
| public boolean equals(Object o) { |
| if (this == o) { |
| return true; |
| } |
| |
| if (o instanceof ArrayMatcher) { |
| ArrayMatcher am = (ArrayMatcher)o; |
| if (contexts.length == am.contexts.length) { |
| for (int i = contexts.length - 1; i >= 0; i--) { |
| if (!contexts[i].equals(am.contexts[i])) { |
| return false; |
| } |
| } |
| return true; |
| } |
| } |
| |
| return false; |
| } |
| |
| } |
| |
| } |