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Apache jSieve is a server side mail filtering system implementing RFC3028. Apache jSieve is developed by the JAMES project.
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package org.apache.jsieve.tests.optional;

import java.util.List;
import java.util.ListIterator;

import org.apache.jsieve.Arguments;
import org.apache.jsieve.SieveContext;
import org.apache.jsieve.StringListArgument;
import org.apache.jsieve.TagArgument;
import org.apache.jsieve.exception.SieveException;
import org.apache.jsieve.exception.SyntaxException;
import org.apache.jsieve.mail.MailAdapter;
import org.apache.jsieve.mail.SieveMailException;
import org.apache.jsieve.tests.AbstractTest;

/**
 * This implements a single subset of the 'body' Sieve test as define here:
 * http://tools.ietf.org/html/draft-ietf-sieve-body-00
 */
public class Body extends AbstractTest {
    private StringListArgument strings;

    public Body() {
        super();
        strings = null;
    }

    // Validate (sorta); we're only implementing part of the spec
    protected void validateArguments(Arguments args, SieveContext ctx)
            throws SieveException {

        List arglist = args.getArgumentList();
        if (arglist.size() != 2) {
            throw new SyntaxException(
                    "Currently body-test can only two arguments");
        }

        // FIXME: As this is a limited implementation force the use of
        // ':contains'.
        Object arg = arglist.get(0);
        if (!(arg instanceof TagArgument)) {
            throw new SyntaxException("Body expects a :contains tag");
        }

        if (!((TagArgument) arg).getTag().equals(":contains")) {
            throw new SyntaxException("Body expects a :contains tag");
        }

        // Get list of strings to search for
        arg = arglist.get(1);
        if (!(arg instanceof StringListArgument)) {
            throw new SyntaxException("Body expects a list of strings");
        }
        strings = (StringListArgument) args.getArgumentList().get(1);
    }

    // This implement body tests of the form
    // "body :contains ['string' 'string' ....]"
    protected boolean executeBasic(MailAdapter mail, Arguments args,
            SieveContext ctx) throws SieveException {
        // Attempt to fetch content as a string. If we can't do this it's
        // not a message we can handle.
        if (mail.getContentType().indexOf("text/") != 0) {
            throw new SieveMailException("Message is not of type 'text'");
        }
        String body = (String) mail.getContent();
        body = body.toLowerCase();

        // Compare each test string with body, ignoring case
        ListIterator iter = strings.getList().listIterator();
        while (iter.hasNext()) {
            String str = (String) iter.next();
            if (body.indexOf(str.toLowerCase()) != -1) {
                return true;
            }
        }
        return false;
    }

}