qpid-jms-client/src/main/java/org/apache/qpid/jms/selector/filter/BinaryExpression.java [53:78]:
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    @Override
    public int hashCode() {
        return toString().hashCode();
    }

    /**
     * TODO: more efficient hashCode()
     *
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object o) {

        if (o == null || !this.getClass().equals(o.getClass())) {
            return false;
        }
        return toString().equals(o.toString());
    }

    /**
     * Returns the symbol that represents this binary expression.  For example, addition is
     * represented by "+"
     *
     * @return the symbol String
     */
    public abstract String getExpressionSymbol();
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qpid-jms-client/src/main/java/org/apache/qpid/jms/selector/filter/UnaryExpression.java [228:252]:
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    @Override
    public int hashCode() {
        return toString().hashCode();
    }

    /**
     * TODO: more efficient hashCode()
     *
     * @see java.lang.Object#equals(java.lang.Object)
     */
    @Override
    public boolean equals(Object o) {
        if (o == null || !this.getClass().equals(o.getClass())) {
            return false;
        }
        return toString().equals(o.toString());
    }

    /**
     * Returns the symbol that represents this binary expression. For example,
     * addition is represented by "+"
     *
     * @return the symbol String
     */
    public abstract String getExpressionSymbol();
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