blob: b78cc57e45caa342ed927d36f23a746bb6c3f3f5 [file] [log] [blame]
/*
* $Header: /cvs/xierpa/aQute.util.jar/src/aQute/lib/osgi/Instruction.java,v 1.1 2007-01-03 19:54:32 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.lib.osgi;
import java.util.regex.*;
public class Instruction {
Pattern pattern;
String instruction;
boolean negated;
boolean optional;
public Instruction(String instruction, boolean negated) {
this.instruction = instruction;
this.negated = negated;
}
public boolean matches(String value) {
return getMatcher(value).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 Instruction getPattern(String string) {
boolean negated = false;
if (string.startsWith("!")) {
negated = true;
string = string.substring(1);
}
StringBuffer sb = new StringBuffer();
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 Instruction(sb.toString(), negated);
}
public String toString() {
return getPattern();
}
public Matcher getMatcher(String value) {
if (pattern == null) {
pattern = Pattern.compile(instruction);
}
return pattern.matcher(value);
}
public int hashCode() {
return instruction.hashCode();
}
public boolean equals(Object other) {
return other != null && (other instanceof Instruction)
&& instruction.equals(((Instruction) other).instruction);
}
public void setOptional() {
optional = true;
}
public boolean isOptional() {
return optional;
}
}