hugegraph-common/src/main/java/com/baidu/hugegraph/event/Event.java

/*
 * Copyright 2017 HugeGraph Authors
 *
 * 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 com.baidu.hugegraph.event;

import java.util.Arrays;
import java.util.Collections;

import com.baidu.hugegraph.util.E;

public class Event extends java.util.EventObject {

    private static final long serialVersionUID = 1625973849208342813L;

    private String name;
    private Object[] args;

    public Event(Object source, String event) {
        this(source, event, Collections.emptyList().toArray());
    }

    public Event(Object source, String event, Object... args) {
        super(source);
        this.name = event;
        this.args = args;
    }

    public String name() {
        return this.name;
    }

    public Object[] args() {
        return this.args;
    }

    public void checkArgs(Class<?>... classes) throws IllegalArgumentException {
        E.checkArgument(this.args.length == classes.length,
                        "The args count of event '%s' should be %s(actual %s)",
                        this.name, classes.length, this.args.length);
        int i = 0;
        for (Class<?> c : classes) {
            Object arg = this.args[i++];
            if (arg == null) {
                continue;
            }
            E.checkArgument(c.isAssignableFrom(arg.getClass()),
                            "The arg '%s'(%s) can't match %s",
                            arg, arg.getClass(), c);
        }
    }

    @Override
    public String toString() {
        return String.format("Event{name='%s', args=%s}",
                             this.name, Arrays.asList(this.args));
    }
}