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/*
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
 *
 * Copyright (c) 1997-2013 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * https://glassfish.dev.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
 *
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 *
 * GPL Classpath Exception:
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 *
 * Modifications:
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 */

package javax.mail.search;

import javax.mail.Message;

/**
 * This class implements the logical NEGATION operator.
 *
 * @author Bill Shannon
 * @author John Mani
 */
public final class NotTerm extends SearchTerm {
    /**
     * The search term to negate.
     *
     * @serial
     */
    private SearchTerm term;

    private static final long serialVersionUID = 7152293214217310216L;

    public NotTerm(SearchTerm t) {
	term = t;
    }

    /**
     * Return the term to negate.
     *
     * @return	the Term
     */
    public SearchTerm getTerm() {
	return term;
    }

    /* The NOT operation */
    public boolean match(Message msg) {
	return !term.match(msg);
    }

    /**
     * Equality comparison.
     */
    public boolean equals(Object obj) {
	if (!(obj instanceof NotTerm))
	    return false;
	NotTerm nt = (NotTerm)obj;
	return nt.term.equals(this.term);
    }

    /**
     * Compute a hashCode for this object.
     */
    public int hashCode() {
	return term.hashCode() << 1;
    }
}