/*

 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.  Oracle designates this

 * particular file as subject to the "Classpath" exception as provided

 * by Oracle in the LICENSE file that accompanied this code.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package jdk.jfr.internal.consumer;

import java.util.HashMap;

import java.util.Map;

import java.util.StringJoiner;

public final class ParserFilter {

    public static final ParserFilter ACCEPT_ALL = new ParserFilter(true, Map.of());

    private final Map<String, Long> thresholds;

    private final boolean acceptAll;

    public ParserFilter() {

        this(false, new HashMap<>());

    }

    private ParserFilter(boolean acceptAll, Map<String, Long> thresholds) {

        this.acceptAll = acceptAll;

        this.thresholds = thresholds;

    }

    public void setThreshold(String eventName, long nanos) {

        Long l = thresholds.get(eventName);

        if (l != null) {

            l = Math.min(l, nanos);

        } else {

            l = nanos;

        }

        thresholds.put(eventName, l);

    }

    public long getThreshold(String eventName) {

        if (acceptAll) {

            return 0L;

        }

        Long l = thresholds.get(eventName);

        if (l != null) {

            return l;

        }

        return -1;

    }

    public String toString() {

        if (acceptAll) {

            return "ACCEPT ALL";

        }

        StringJoiner sb = new StringJoiner(", ");

        for (String key : thresholds.keySet().toArray(new String[0])) {

            Long value = thresholds.get(key);

            sb.add(key + " = " + value);

        }

        return sb.toString();

    }