/**************************************************************************************
 * Copyright (C) 2008 EsperTech, Inc. All rights reserved.                            *
 * http://esper.codehaus.org                                                          *
 * http://www.espertech.com                                                           *
 * ---------------------------------------------------------------------------------- *
 * The software in this package is published under the terms of the GPL license       *
 * a copy of which has been included with this distribution in the license.txt file.  *
 **************************************************************************************/
package com.espertech.esper.filter;

import com.espertech.esper.client.EventType;

import java.io.StringWriter;
import java.util.ArrayDeque;
import java.util.List;

/**
 * Container for filter values for use by the {@link FilterService} to filter and distribute incoming events.
 */
public class FilterValueSetImpl implements FilterValueSet
{
    private final EventType eventType;
    private final ArrayDeque<FilterValueSetParam> parameters;

    /**
     * Ctor.
     * @param eventType - type of event to filter for
     * @param parameters - list of filter parameters
     */
    public FilterValueSetImpl(EventType eventType, ArrayDeque<FilterValueSetParam> parameters)
    {
        this.eventType = eventType;
        this.parameters = parameters;
    }

    /**
     * Returns event type to filter for.
     * @return event type to filter for
     */
    public EventType getEventType()
    {
        return eventType;
    }

    /**
     * Returns list of filter parameters.
     * @return list of filter parameters
     */
    public ArrayDeque<FilterValueSetParam> getParameters()
    {
        return parameters;
    }

    public String toString() {
        return "FilterValueSetImpl{" +
                "eventType=" + eventType.getName() +
                ", parameters=" + parameters +
                '}';
    }

    public void appendTo(StringWriter writer) {
        writer.append(eventType.getName());
        writer.append("(");
        String delimiter = "";
        for (FilterValueSetParam param : parameters) {
            writer.append(delimiter);
            param.appendTo(writer);
            delimiter = ",";
        }
        writer.append(")");
    }
}