/**
 *
 * Copyright 2020 Paul Schaub
 *
 * 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 org.jivesoftware.smackx.file_metadata.element.child;

import org.jivesoftware.smack.packet.NamedElement;
import org.jivesoftware.smack.packet.XmlEnvironment;
import org.jivesoftware.smack.util.EqualsUtil;
import org.jivesoftware.smack.util.HashCode;
import org.jivesoftware.smack.util.XmlStringBuilder;

/**
 * Length of an audio or video file, in milliseconds.
 */
public class LengthElement implements NamedElement {

    public static final String ELEMENT = "length";

    private final long length;

    public LengthElement(long length) {
        if (length < 0) {
            throw new IllegalArgumentException("Length cannot be negative.");
        }
        this.length = length;
    }

    /**
     * Return the length of the audio or video file.
     *
     * @return length in milliseconds
     */
    public long getLength() {
        return length;
    }

    @Override
    public XmlStringBuilder toXML(XmlEnvironment xmlEnvironment) {
        return new XmlStringBuilder(this)
                .rightAngleBracket()
                .append(Long.toString(getLength()))
                .closeElement(this);
    }

    @Override
    public String getElementName() {
        return ELEMENT;
    }

    @Override
    public int hashCode() {
        return HashCode.builder()
                .append(getElementName())
                .append(getLength())
                .build();
    }

    @Override
    public boolean equals(Object obj) {
        return EqualsUtil.equals(this, obj, (equalsBuilder, other) ->
                equalsBuilder.append(getElementName(), other.getElementName())
                        .append(getLength(), other.getLength()));
    }
}