org.apache.james.jmap.model.MessagePreviewGenerator.java Source code

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Here is the source code for org.apache.james.jmap.model.MessagePreviewGenerator.java

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 * regarding copyright ownership.  The ASF licenses this file   *
 * to you under the Apache License, Version 2.0 (the            *
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package org.apache.james.jmap.model;

import java.util.Optional;

import javax.inject.Inject;

import org.apache.commons.lang3.StringUtils;
import org.apache.james.jmap.utils.HtmlTextExtractor;

import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;

public class MessagePreviewGenerator {

    public static final String NO_BODY = "(Empty)";
    public static final int MAX_PREVIEW_LENGTH = 256;

    private final HtmlTextExtractor htmlTextExtractor;

    @Inject
    public MessagePreviewGenerator(HtmlTextExtractor htmlTextExtractor) {
        this.htmlTextExtractor = htmlTextExtractor;
    }

    public String forHTMLBody(Optional<String> body) {
        return body.filter(text -> !text.isEmpty()).map(this::asText).map(this::abbreviate).orElse(NO_BODY);
    }

    public String forTextBody(Optional<String> body) {
        return body.filter(text -> !text.isEmpty()).map(this::abbreviate).orElse(NO_BODY);
    }

    @VisibleForTesting
    String asText(String body) throws IllegalArgumentException {
        Preconditions.checkArgument(body != null);
        return htmlTextExtractor.toPlainText(body);
    }

    @VisibleForTesting
    String abbreviate(String body) {
        return StringUtils.abbreviate(body, MAX_PREVIEW_LENGTH);
    }

}