| /* |
| * $Header: /cvsroot/bnd/aQute.libg/src/aQute/libg/clauses/Selector.java,v 1.1 2009/01/19 14:17:42 pkriens Exp $ |
| * |
| * Copyright (c) OSGi Alliance (2006). All Rights Reserved. |
| * |
| * 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 aQute.libg.clauses; |
| |
| import java.util.*; |
| import java.util.regex.*; |
| |
| public class Selector { |
| Pattern pattern; |
| String instruction; |
| boolean negated; |
| Clause clause; |
| |
| public Selector(String instruction, boolean negated) { |
| this.instruction = instruction; |
| this.negated = negated; |
| } |
| |
| public boolean matches(String value) { |
| if (pattern == null) { |
| pattern = Pattern.compile(instruction); |
| } |
| Matcher m = pattern.matcher(value); |
| return m.matches(); |
| } |
| |
| public boolean isNegated() { |
| return negated; |
| } |
| |
| public String getPattern() { |
| return instruction; |
| } |
| |
| /** |
| * Convert a string based pattern to a regular expression based pattern. |
| * This is called an instruction, this object makes it easier to handle the |
| * different cases |
| * |
| * @param string |
| * @return |
| */ |
| public static Selector getPattern(String string) { |
| boolean negated = false; |
| if (string.startsWith("!")) { |
| negated = true; |
| string = string.substring(1); |
| } |
| StringBuilder sb = new StringBuilder(); |
| for (int c = 0; c < string.length(); c++) { |
| switch (string.charAt(c)) { |
| case '.' : |
| sb.append("\\."); |
| break; |
| case '*' : |
| sb.append(".*"); |
| break; |
| case '?' : |
| sb.append(".?"); |
| break; |
| default : |
| sb.append(string.charAt(c)); |
| break; |
| } |
| } |
| string = sb.toString(); |
| if (string.endsWith("\\..*")) { |
| sb.append("|"); |
| sb.append(string.substring(0, string.length() - 4)); |
| } |
| return new Selector(sb.toString(), negated); |
| } |
| |
| public String toString() { |
| return getPattern(); |
| } |
| |
| public Clause getClause() { |
| return clause; |
| } |
| |
| public void setClause(Clause clause) { |
| this.clause = clause; |
| } |
| |
| public static List<Selector> getInstructions(Clauses clauses) { |
| List<Selector> result = new ArrayList<Selector>(); |
| for (Map.Entry<String,Map<String,String>> entry : clauses.entrySet()) { |
| Selector instruction = getPattern(entry.getKey()); |
| result.add(instruction); |
| } |
| return result; |
| } |
| |
| public static <T> List<T> select(Collection<T> domain, List<Selector> instructions) { |
| List<T> result = new ArrayList<T>(); |
| Iterator<T> iterator = domain.iterator(); |
| value: while (iterator.hasNext()) { |
| T value = iterator.next(); |
| for (Selector instruction : instructions) { |
| if (instruction.matches(value.toString())) { |
| if (!instruction.isNegated()) |
| result.add(value); |
| continue value; |
| } |
| } |
| } |
| return result; |
| } |
| |
| } |