/*
 * Copyright 2002-2018 the original author or authors.
 *
 * 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
 *
 *      https://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.springframework.mail;

import java.io.Serializable;
import java.util.Date;

import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.ObjectUtils;
import org.springframework.util.StringUtils;

Models a simple mail message, including data such as the from, to, cc, subject,
and text fields.
Consider JavaMailSender and JavaMail MimeMessages for creating more sophisticated messages, for example messages with attachments, special character encodings, or personal names that accompany mail addresses. 
Author:
Dmitriy Kopylenko, Juergen Hoeller
See Also:
MailSender
JavaMailSender
MimeMessagePreparator
MimeMessageHelper
MimeMailMessage
Since:
10.09.2003/**
 * Models a simple mail message, including data such as the from, to, cc, subject,
 * and text fields.
 *
 * <p>Consider {@code JavaMailSender} and JavaMail {@code MimeMessages} for creating
 * more sophisticated messages, for example messages with attachments, special
 * character encodings, or personal names that accompany mail addresses.
 *
 * @author Dmitriy Kopylenko
 * @author Juergen Hoeller
 * @since 10.09.2003
 * @see MailSender
 * @see org.springframework.mail.javamail.JavaMailSender
 * @see org.springframework.mail.javamail.MimeMessagePreparator
 * @see org.springframework.mail.javamail.MimeMessageHelper
 * @see org.springframework.mail.javamail.MimeMailMessage
 */
@SuppressWarnings("serial")
public class SimpleMailMessage implements MailMessage, Serializable {

	@Nullable
	private String from;

	@Nullable
	private String replyTo;

	@Nullable
	private String[] to;

	@Nullable
	private String[] cc;

	@Nullable
	private String[] bcc;

	@Nullable
	private Date sentDate;

	@Nullable
	private String subject;

	@Nullable
	private String text;


	
Create a new SimpleMailMessage. /**
	 * Create a new {@code SimpleMailMessage}.
	 */
	public SimpleMailMessage() {
	}

	
Copy constructor for creating a new SimpleMailMessage from the state of an existing SimpleMailMessage instance. /**
	 * Copy constructor for creating a new {@code SimpleMailMessage} from the state
	 * of an existing {@code SimpleMailMessage} instance.
	 */
	public SimpleMailMessage(SimpleMailMessage original) {
		Assert.notNull(original, "'original' message argument must not be null");
		this.from = original.getFrom();
		this.replyTo = original.getReplyTo();
		this.to = copyOrNull(original.getTo());
		this.cc = copyOrNull(original.getCc());
		this.bcc = copyOrNull(original.getBcc());
		this.sentDate = original.getSentDate();
		this.subject = original.getSubject();
		this.text = original.getText();
	}


	@Override
	public void setFrom(String from) {
		this.from = from;
	}

	@Nullable
	public String getFrom() {
		return this.from;
	}

	@Override
	public void setReplyTo(String replyTo) {
		this.replyTo = replyTo;
	}

	@Nullable
	public String getReplyTo() {
		return this.replyTo;
	}

	@Override
	public void setTo(String to) {
		this.to = new String[] {to};
	}

	@Override
	public void setTo(String... to) {
		this.to = to;
	}

	@Nullable
	public String[] getTo() {
		return this.to;
	}

	@Override
	public void setCc(String cc) {
		this.cc = new String[] {cc};
	}

	@Override
	public void setCc(String... cc) {
		this.cc = cc;
	}

	@Nullable
	public String[] getCc() {
		return this.cc;
	}

	@Override
	public void setBcc(String bcc) {
		this.bcc = new String[] {bcc};
	}

	@Override
	public void setBcc(String... bcc) {
		this.bcc = bcc;
	}

	@Nullable
	public String[] getBcc() {
		return this.bcc;
	}

	@Override
	public void setSentDate(Date sentDate) {
		this.sentDate = sentDate;
	}

	@Nullable
	public Date getSentDate() {
		return this.sentDate;
	}

	@Override
	public void setSubject(String subject) {
		this.subject = subject;
	}

	@Nullable
	public String getSubject() {
		return this.subject;
	}

	@Override
	public void setText(String text) {
		this.text = text;
	}

	@Nullable
	public String getText() {
		return this.text;
	}


	
Copy the contents of this message to the given target message.
Params:
target – the MailMessage to copy to/**
	 * Copy the contents of this message to the given target message.
	 * @param target the {@code MailMessage} to copy to
	 */
	public void copyTo(MailMessage target) {
		Assert.notNull(target, "'target' MailMessage must not be null");
		if (getFrom() != null) {
			target.setFrom(getFrom());
		}
		if (getReplyTo() != null) {
			target.setReplyTo(getReplyTo());
		}
		if (getTo() != null) {
			target.setTo(copy(getTo()));
		}
		if (getCc() != null) {
			target.setCc(copy(getCc()));
		}
		if (getBcc() != null) {
			target.setBcc(copy(getBcc()));
		}
		if (getSentDate() != null) {
			target.setSentDate(getSentDate());
		}
		if (getSubject() != null) {
			target.setSubject(getSubject());
		}
		if (getText() != null) {
			target.setText(getText());
		}
	}


	@Override
	public boolean equals(@Nullable Object other) {
		if (this == other) {
			return true;
		}
		if (!(other instanceof SimpleMailMessage)) {
			return false;
		}
		SimpleMailMessage otherMessage = (SimpleMailMessage) other;
		return (ObjectUtils.nullSafeEquals(this.from, otherMessage.from) &&
				ObjectUtils.nullSafeEquals(this.replyTo, otherMessage.replyTo) &&
				ObjectUtils.nullSafeEquals(this.to, otherMessage.to) &&
				ObjectUtils.nullSafeEquals(this.cc, otherMessage.cc) &&
				ObjectUtils.nullSafeEquals(this.bcc, otherMessage.bcc) &&
				ObjectUtils.nullSafeEquals(this.sentDate, otherMessage.sentDate) &&
				ObjectUtils.nullSafeEquals(this.subject, otherMessage.subject) &&
				ObjectUtils.nullSafeEquals(this.text, otherMessage.text));
	}

	@Override
	public int hashCode() {
		int hashCode = ObjectUtils.nullSafeHashCode(this.from);
		hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.replyTo);
		hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.to);
		hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.cc);
		hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.bcc);
		hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.sentDate);
		hashCode = 29 * hashCode + ObjectUtils.nullSafeHashCode(this.subject);
		return hashCode;
	}

	@Override
	public String toString() {
		StringBuilder sb = new StringBuilder("SimpleMailMessage: ");
		sb.append("from=").append(this.from).append("; ");
		sb.append("replyTo=").append(this.replyTo).append("; ");
		sb.append("to=").append(StringUtils.arrayToCommaDelimitedString(this.to)).append("; ");
		sb.append("cc=").append(StringUtils.arrayToCommaDelimitedString(this.cc)).append("; ");
		sb.append("bcc=").append(StringUtils.arrayToCommaDelimitedString(this.bcc)).append("; ");
		sb.append("sentDate=").append(this.sentDate).append("; ");
		sb.append("subject=").append(this.subject).append("; ");
		sb.append("text=").append(this.text);
		return sb.toString();
	}


	@Nullable
	private static String[] copyOrNull(@Nullable String[] state) {
		if (state == null) {
			return null;
		}
		return copy(state);
	}

	private static String[] copy(String[] state) {
		return state.clone();
	}

}