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• ListFoldersExtractor.java

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com.google.sitebricks.mail.imap.ListFoldersExtractor Maven / Gradle / Ivy

package com.google.sitebricks.mail.imap;

import com.google.common.collect.ImmutableList;

import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

/**
 * @author [email protected] (Dhanji R. Prasanna)
 */
class ListFoldersExtractor implements Extractor> {
  private static final Pattern QUOTES = Pattern.compile("(\".*\")");
  private static final String ROOT_PREFIX = "\"/\"";

  @Override
  public List extract(List messages) {
    ImmutableList.Builder builder = ImmutableList.builder();
    for (String message : messages) {
      Matcher matcher = QUOTES.matcher(message);
      if (matcher.find()) {
        String group = matcher.group(1);

        if (group.startsWith(ROOT_PREFIX)) {
          group = group.substring(ROOT_PREFIX.length()).trim();
        }

        // Strip quotes.
        if (group.startsWith("\"")) {
          group = group.substring(1, group.length() - 1);
        }

        // Generally remove leading "/" and stripquotes
        builder.add(group);
      }
    }

    return builder.build();
  }
}