//
// ========================================================================
// Copyright (c) 1995-2020 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under
// the terms of the Eclipse Public License 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0
//
// This Source Code may also be made available under the following
// Secondary Licenses when the conditions for such availability set
// forth in the Eclipse Public License, v. 2.0 are satisfied:
// the Apache License v2.0 which is available at
// https://www.apache.org/licenses/LICENSE-2.0
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//

package org.eclipse.jetty.util;

import java.net.URI;
import java.util.ArrayList;
import java.util.List;
import java.util.regex.Pattern;

public abstract class PatternMatcher
{
    public abstract void matched(URI uri) throws Exception;

    public void match(String pattern, URI[] uris, boolean isNullInclusive)
        throws Exception
    {
        Pattern p = (pattern == null ? null : Pattern.compile(pattern));
        match(p, uris, isNullInclusive);
    }

    
Find jar names from the provided list matching a pattern.
If the pattern is null and isNullInclusive is true, then
all jar names will match.
A pattern is a set of acceptable jar names. Each acceptable
jar name is a regex. Each regex can be separated by either a
"," or a "|". If you use a "|" this or's together the jar
name patterns. This means that ordering of the matches is
unimportant to you. If instead, you want to match particular
jar names, and you want to match them in order, you should
separate the regexs with "," instead.
Eg "aaa-.*\\.jar|bbb-.*\\.jar"
Will iterate over the jar names and match
in any order.
Eg "aaa-*\\.jar,bbb-.*\\.jar"
Will iterate over the jar names, matching
all those starting with "aaa-" first, then "bbb-".
Params:
pattern – the pattern
uris – the uris to test the pattern against
isNullInclusive – if true, an empty pattern means all names match, if false, none match
Throws:
Exception – if fundamental error in pattern matching/**
     * Find jar names from the provided list matching a pattern.
     *
     * If the pattern is null and isNullInclusive is true, then
     * all jar names will match.
     *
     * A pattern is a set of acceptable jar names. Each acceptable
     * jar name is a regex. Each regex can be separated by either a
     * "," or a "|". If you use a "|" this or's together the jar
     * name patterns. This means that ordering of the matches is
     * unimportant to you. If instead, you want to match particular
     * jar names, and you want to match them in order, you should
     * separate the regexs with "," instead.
     *
     * Eg "aaa-.*\\.jar|bbb-.*\\.jar"
     * Will iterate over the jar names and match
     * in any order.
     *
     * Eg "aaa-*\\.jar,bbb-.*\\.jar"
     * Will iterate over the jar names, matching
     * all those starting with "aaa-" first, then "bbb-".
     *
     * @param pattern the pattern
     * @param uris the uris to test the pattern against
     * @param isNullInclusive if true, an empty pattern means all names match, if false, none match
     * @throws Exception if fundamental error in pattern matching
     */
    public void match(Pattern pattern, URI[] uris, boolean isNullInclusive)
        throws Exception
    {
        if (uris != null)
        {
            String[] patterns = (pattern == null ? null : pattern.pattern().split(","));

            List<Pattern> subPatterns = new ArrayList<Pattern>();
            for (int i = 0; patterns != null && i < patterns.length; i++)
            {
                subPatterns.add(Pattern.compile(patterns[i]));
            }
            if (subPatterns.isEmpty())
                subPatterns.add(pattern);

            if (subPatterns.isEmpty())
            {
                matchPatterns(null, uris, isNullInclusive);
            }
            else
            {
                //for each subpattern, iterate over all the urls, processing those that match
                for (Pattern p : subPatterns)
                {
                    matchPatterns(p, uris, isNullInclusive);
                }
            }
        }
    }

    public void matchPatterns(Pattern pattern, URI[] uris, boolean isNullInclusive)
        throws Exception
    {
        for (int i = 0; i < uris.length; i++)
        {
            URI uri = uris[i];
            String s = uri.toString();
            if ((pattern == null && isNullInclusive) ||
                (pattern != null && pattern.matcher(s).matches()))
            {
                matched(uris[i]);
            }
        }
    }
}